IPad2 Battery Life Expectancy

My iPad2 will be 2 1/2 years old come the end of September of this year. We are leaving at that time on a combined six-week land/sea trip and I am concerned that the battery on my unit may exceed its life expectancy during this trip. If so, I will have no backup device along with me. I'm unable to find a good source of information as to what the life expectancy on the battery may be and I recognize that it can be highly user-dependent. Is there a source to provide me with some guidelines that would help me to determine if it would be prudent for me to replace the battery before we leave?

Chris, thanks for this. The battery at this point has shown no signs of degradation whatever but I am a belt and suspenders person. It sounds very much to me that buying a backup battery just to guard against the current battery going completely dead between now and November 9, 2013, would not necessarily be a good move. That is especially the case if I could not, in fact, use the battery backup just to keep me going.
Is there any way to measure the current capacity of the battery to take a charge that would allow me to predict what will happen between now and my return date. After we get back I'll be in a position to replace the battery with ease.

Similar Messages

CMOS battery life expectancy on VXIpc-872B

Hello,
I work for Raytheon. We are supporting a subsystem that consists of a VXI chassis with a National Instruments VXIpc-872B as the controller. There are currently between 20 and 30 of these controllers that have been procured from National Instruments. Can you tell me what the battery life expectancy is for the Tadiran TL-5186 CMOS battery as used in the 872 VXIpc controller? We need to provide this information to our customer (and yours) for use in on-going maintenance support.
Thank You,
Dan Nichter
[email protected]

Howdy dannic,
Short answer: The short answer is that the CMOS battery has a shelf life of 10 years.
Longer answer: Motherboards draw power from the CMOS battery to retain BIOS settings, DateTime clock, etc, while the system is turned off. Having said that, the battery life depends upon how you use the VXI controller. If
the VXI controller is turned on all the time, then the battery life will be
extremely long because the CMOS battery isn't being used. However, if the VXI controller is turned off all the time, then the
battery use will be much higher, and the battery life would be
shorter.
Overall, the mean time between failures on CMOS batteries is also about 10 years, and that includes battery life and any
other possible malfunctions. So the
batteries should last for a long time, but it is too hard to specify
further than that because of how dependent the battery life is on the
system configuration and usage. If you would like to implement a
battery replacement rotation program, you should be extremely safe
replacing them every 5 years or so.
Here's an additional reference you might find handy, if not for posterity's sake:
KnowledgeBase 2JIGCU00: Information about the Lithium Battery in the VXIpc-770/870B Controllers
I hope this helps!
Message Edited by pBerg on 05-02-2008 01:08 PM
Message Edited by pBerg on 05-02-2008 01:09 PM
Warm regards,
pBerg

HT1446 Battery life expectancy

What is better for the battery life expectancy?
Keep the device connected on power supply, even though the battery is fully charged, or disconnect the power supply cable using the battery charging?I have a MacPro 13 with retina display.
Thanks in advance.

You can keep it connected to the power supply most of the time. But use it on battery about once a week. When you do, recharge it when the battery reaches about 20-25%. Other than that: avoid high temperatures (>35°C/95°F).

Battery Life Expectations [SOLVED]

Name says it all.
Already followed any relelvant suggestions on http://www.lesswatts.org/ , but still have underwhelming battery life. < 2hrs.
It has an nvidia GPU and AMD processor if there's anything specific for power to those.
Last edited by Mardoct (2009-10-01 21:07:48)

AMD means no powertop, so everything is a little more difficult to measure. And you'll have to take a lot of measurements while doing a lot of experimentation.
You can get your current (pun!) consumption with:
watch -n 1 cat /proc/acpi/battery/BAT1/state
Just make sure you are not plugged in while metering.
Physically remove things you don't use. Do you use your cd-rom? It sucks some power just sitting there. I usually pull mine out, but cdrom drives are less modular in modern laptops.
Scale back to bare minimums. Do you really need your wifi card belting out at 100% power? Play with the txpower, see what you can get away with.
Are you frequency scaling your CPU? Drop your frequency by 30% and power is cut in half. See if you can live at this frequency permanently.
Do you have a hard drive? SSDs are better about power use. I take it to an extreme and have replaced my hard drive with a microSDHC card.
How good is your heatsink? By replacing a thick heat transfer pad with a block of copper and some Arctic Silver, my average temperature dropped 10C and the fan never comes on, saving 0.5 watts.
I will never give up my massive amount of ram, but it does add up. Every 100MB of cheap desktop ram might need 2 watts of power. Quality laptop ram can be ten times more efficient, but all ram needs juice. Every bit is refreshed hundreds of times a second, even if it is not being used, and that extra gig is another watt or two.
In short, the easiest way to save energy is to do less.
edit: I forgot one. Laptops use LCD screens, which operate by obstructing white light from the backlight. It actually takes energy to display a black pixel, because the natural rest state of an LCD is transparent. Switching from an all black theme to an all white theme saved another half a watt.
Last edited by keenerd (2009-10-01 03:50:39)

What is the expected battery life for a battery in the MacBook Pro (Late 2007)?

I purchased a replacement battery from an Apple Retailer for my son's 17" MacBook Pro (Late 2007) in December 2009. Last week, he gets a "service battery" message and the battery won't hold a charge. Is this the best we can expect in terms of battery life? It was supposed to be an Apple Battery.

Has your son been calibrating the battery per the user manual schedule? Has he been using the computer properly? According to the user manual it states in part:"Do not operate your MacBook Pro on a pillow or other soft material, as the material can block the airflow vents. Never place anything over the keyboard when operating your MacBook Pro. Never push objects into the ventilation openings."
MacBook Pro: Care, Use, and Safety Information
"Do not place your MacBook Pro on your lap or other body surface for extended periods of time. Prolonged body contact can cause discomfort and potentially a burn."
Apple notebook batteries – maintenance and troubleshooting
http://support.apple.com/kb/HT1446 Apple Portables: Tips for maximizing your battery charge
http://support.apple.com/kb/HT1490 Apple Portables: Calibrating your computer's battery for best performance
Maximize the battery life

Any way to measure the life expectancy of a PRAM battery?

Is there any way to measure the life expectancy of the PRAM battery through software? Or must one open the case to determine the left over charge? I have an iMac 5,1 that thus far is doing well. But I am well aware the age suggests the PRAM battery may go soon, and I will have a two week period soon where I won't be accessing it, having to leave it off.

I'd love to know if there is something out there to do this. Just spent a few minutes searching and was only able to find something years out of date for the old 1/2 AA G3 PRAM battery, that only works in OS 9.
The best I've seen is to disable automatic time updating, shut down and unplug for several hours, and see if the clock is still on time when you reconnect to power. This seems very imprecise, to say the least, and you will be draining more power from the battery while it's off wall power.
Of course, you can always take it out and measure it with a volt meter, but it would be insane to go through all that just to measure it and put the same one back.
I think the life expectancy of one of the CR2032s, the lithium button battery which I'm supposing your early Intel, circa 2006, uses is around five years.
If this is your model, replacement doesn't look all that painful. My late 2009 21.5 is a total nightmare with 35 steps. Keeps on going even after the logic board is out. Why Apple puts what should be a user replaceable item in such an inaccessible place -- and getting more inaccessible with each new model -- I have no idea. I guess you're just supposed to throw out the computer when the battery dies.

Hi i received the nano 7th gen for Christmas and I only seem to get 5 hours of battery life. I use the Bluetooth and Nike app so I expect more drain on the battery. But I got more time out of running with my iPhone. Does this sound normal? I thought I sh

Hi i received the nano 7th gen for Christmas and I only seem to get 5 hours of battery life. I use the Bluetooth and Nike app so I expect more drain on the battery. But I got more time out of running with my iPhone. Does this sound normal? I thought I should get close to 30 hrs of just play time alone.
ALso, my wife got me the Belkin armband to run with the nano but I sweat through the band resulting in the back of the iPod to get wet. Surely this is not good. Anyone have a recommendation for an armband that keeps moisture away from the pod?

iPod Nano are small and they don't use Wi-Fi access so you get less power time on a Nano. As for iPhone, since you got apps, Wi-Fi + 3G access, and everything else, they give you more time so you can keep using. Nanos are ment to listen to music, listen to radio, view your photos, watch videos (without Wi-Fi) and since you got BlueTooth on the nano, it counts as wireless access so it drains your battery faster.

Problem with ios 6 battery life in ipad2

after installing ios 6 my ipad my battery life is down, it is also charging very slowly, please help, this is very frustrating, the battery life was 33% two hours ago now it is 34% only moved to 1% in the last 2hr, does anyone have the same problem?

I have an ipad2 and since downloading io6 with wifi ( not connecting to iTunes) my battery life is very short too . I have an 8 year old iMac and was told by apple not to sync with iPhone . Are there any setting in iPad 2 that can be reset that u know of
Thanks

What is the expected battery life of a macbook air?

What is the expected battery life in hours of a Macbook Air? I have a 2012 model and it is only about 1 1/2 hours.

About 1,000 full charge cycles. Mac notebooks- Determining battery cycle count - Apple Support.

I have the new iPad. Even with airplane mode on, my battery life is extremely limited. Is there a problem with the battery? I used to have the ipad2 and had no such problem.

I have the new iPad. Even with airplane mode on, my battery life is extremely limited. Is there a problem with the battery? I used to have the ipad2 and had no such problem.

What is your brightness setting & how many apps are open?
The quickest way (and really the only way) to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.
How to Calibrate Your Mac, iPhone, or iPad Battery
http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html
Also, if you have a 3rd generation iPad, look at
Apple: iPad Battery Nothing to Get Charged Up About
http://allthingsd.com/20120327/apple-ipad-battery-nothing-to-get-charged-up-abou t/
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
http://www.macrumors.com/2012/03/27/apple-explains-new-ipads-continued-charging- beyond-100-battery-level/
New iPad Takes Much Longer to Charge Than iPad 2
http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
Extend iPad Battery Life (Look at pjl123 comment)
https://discussions.apple.com/thread/3921324?tstart=30
New iPad Slow to Recharge, Barely Charges During Use
http://www.pcworld.com/article/252326/new_ipad_slow_to_recharge_barely_charges_d uring_use.html
Tips About Charging for New iPad 3
http://goodscool-electronics.blogspot.com/2012/04/tips-about-charging-for-new-ip ad-3.html
Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad
In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.
 Cheers, Tom

Just got my iPad 2 three days ago and noticed the battery life drops faster than I expected at least compared to the others ones around

Just got my iPad 2 three days ago and noticed the battery life drops faster than I expected at least compared to the others ones around, please I need to know the cause and how to effect necessary changes that will prolong the battery life as I have gone through the settings which includes turning off the push notifications, reduce brightness and so on but that doesn't seem to help much.

FYI
The quickest way (and really the only way) to charge your iPad is with the included 10W or 12W (5W on Mini) USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (2.5W, most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.
How to Calibrate Your Mac, iPhone, or iPad Battery
http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html
Also, if you have a 3rd generation iPad, look at
Apple: iPad Battery Nothing to Get Charged Up About
http://allthingsd.com/20120327/apple-ipad-battery-nothing-to-get-charged-up-abou t/
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
http://www.macrumors.com/2012/03/27/apple-explains-new-ipads-continued-charging- beyond-100-battery-level/
New iPad Takes Much Longer to Charge Than iPad 2
http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
iPhone: Hardware troubleshooting (Power/Battery section also applies to iPad)
http://support.apple.com/kb/TS2802
Extend iPad Battery Life (Look at pjl123 comment)
https://discussions.apple.com/thread/3921324?tstart=30
New iPad Slow to Recharge, Barely Charges During Use
http://www.pcworld.com/article/252326/new_ipad_slow_to_recharge_barely_charges_d uring_use.html
Best Practices for iPad Battery Charging
http://www.ilounge.com/index.php/articles/comments/best-practices-for-ipad-batte ry-charging/
Tips About Charging for New iPad 3
http://goodscool-electronics.blogspot.com/2012/04/tips-about-charging-for-new-ip ad-3.html
How to Save and Prolong the battery life of your new ipad
https://discussions.apple.com/thread/4480944?tstart=0
Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad
iPhone, iPod, Using the iPad Charger
http://support.apple.com/kb/HT4327
Install and use Battery Doctor HD
http://itunes.apple.com/tw/app/battery-doctor-hd/id459702901?mt=8
To Extend a Device’s Battery Life, Get to Know It Better
http://tinyurl.com/b67c7xz
iPad Battery Replacement
http://www.apple.com/batteries/replacements.html
In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.
~~~~~~~~~~~~~
Since you are a new iPad user .....
Complete guide to using iOS 6
http://howto.cnet.com/ios-6-complete-guide/
Guide to Built-In Apps on iOS
https://sites.google.com/site/appleclubfhs/support/advice-and-articles/guide-to- built-in-apps-ios
You can download a complete iOS 5 iPad User Guide and iOS 6 iPad User Guide here: http://support.apple.com/manuals/ipad/
Also, Good Instructions http://www.tcgeeks.com/how-to-use-ipad-2/
Apple - iPad - Guided Tours
http://www.apple.com/ipad/videos/
Apple iPad Guided Tours - Watch the videos see all the amazing iPad apps in action. Learn how to use FaceTime, Mail, Safari, Videos, Maps, iBooks, App Store, and more.
http://www.youtube.com/watch?v=YT2bD0-OqBM
http://www.youtube.com/watch?v=ROY4tLyNlsg&feature=relmfu
http://www.youtube.com/watch?v=QSPXXhmwYf4&feature=relmfu
How to - Articles & User Guides & Tutorials
http://www.iphone-mac.com/index.php/Index/howto/id/4/type/select
iPad How-Tos http://ipod.about.com/lr/ipad_how-tos/903396/1/
You can download an iPad User Guide to the iPad from the iTunes store.
 Cheers, Tom

Battery life seems short or the battery does not hold a charge, seems to drain quickly or does not last as long as expected.

Solved!
Go to Solution.

IMPORTANT Notes while charging your Reader device:
It is recommended to charge the Reader using the supplied AC Adapter. When using the AC adapter to charge your Reader device, the lightning bolt symbol that appears next to the battery icon [FIG. 1] on the display of your Reader device is an indication that it is connected to AC power and is charging the battery properly. If the lightning bolt symbol is not present, double check the AC Adapter to ensure that your Reader device is properly connected. This symbol does not appear while charging via a USB connection.
If you charge via a USB connection and leave your Reader Digital Book connected to the computer to charge and the computer goes into sleep/hibernation, charging will stop and the red charge indicator on the Reader will turn off. If left connected, your battery may begin to discharge. To avoid this, turn off any sleep/hibernation settings while charging or set your sleep or hibernation settings to come on after your Reader Digital Book has been charged and then disconnect it from the computer once charging has completed.
It will take approximately 4 hours to achieve a full charge with a computer. It will take approximately 2 hours to achieve a full charge with the optional AC Adapter.
If your Reader Digital Book is left connected to a powered USB hub while the computer is shut down, your battery may begin to discharge. Disconnect your Reader from the hub when the computer is not powered on.
Always verify that your Reader is fully charged by disconnecting it from the computer and checking the battery indicator. The battery indicator will display 4 black bars when it is fully charged
On a full charge, the battery has the capability of up to 7,500 continuous page turns. Actual battery life will vary based on usage patterns, settings and battery conditions. When the Reader is turned on, off, or a page is marked, battery power is used, thus lowering the expected battery life.
NOTE: When storing the Reader for a long period of time, use the Device Shutdown feature in the Advanced settings menu. After using Device Shutdown, it may take approximately 30 seconds for the Reader to start the next time the Reader is turned on.
Playing audio will reduce the battery life. If you did not start audio play back intentionally, confirm audio is not playing. You will not hear playback unless headphones are connected. Audio playback will continue until it is stopped by turning it off from the Now Playing menu. To see if audio is playing, press the HOME button and then press the OPTION button. If Now Playing is displayed in the dialogue box that appears, tap Now Playing and this will take you to the song that is playing. Press the Pause button to stop playback of that song and then press the HOME button.
NOTES:
Due to the nature of the E Ink electronic display technology, the LCD can retain an image without having power. Turning the page is the only time power is consumed. If the Reader's power is drained, the LCD will retain the last image that was displayed, thus making it appear like the Reader is frozen and in some instances it will not have enough power to perform other operations such as turning on or off.
Battery life can be affected by operating temperatures below 41 degrees F, lack of use, or if the battery has not been given enough time to fully charge.
As with any battery, if the Reader is stored for an extended period of time, the battery will discharge on it's own. Therefore, it may be necessary to charge the battery prior to use.
If the Reader has not been used for an extended period of time, repeatedly charging and discharging will improve the efficiency of the battery.
If the battery life still seems short, the battery may need to be replaced.

IPhone 4S Battery Life: Best solutions and procedures for 1st time user: 1-Do you have a battery life issue (learn first what the usage time spec is about) 2-What can you try to remedy the situation without reading 500 pages of posts

What follows is a grouping of some of the most fruitful procedures - from what I've seen in the biggest battery life issue thread - and some background information and discussion for solving or improving the battery life with the iPhone 4S and may be applicable also to devices on which iOS 5.0/5.0.1 has been applied. Credit goes to the respective users who contributed this information to the forum and they should be commended for doing so. This is not a final listing. The goal here is to provide a first stop sort of knowledge base document for newcomers instead of having them perusing the never ending threads where the wheel is reinvented on every page...
Please don't post your questions, usage screenshots, or claims that it worked or not for you or anything here except PROCEDURES/DEBUG STEPS/SOLUTIONS or improvements to the procedures already listed here. Try to use point form and to be as concise and clear as possible. Hope all this helps.
Thank you and good luck!
General info and specs
First, take a look Apple's battery tips, info and specs(obligatory reading for all Iphone 4S users - read it once and for all):
http://www.apple.com/batteries/iphone.html
http://www.apple.com/batteries/
... you didn't read it? loll Always remember this i.e. the definition of "usage":
Usage: Amount of time iPhone has been awake and in use since the last full charge. The phone is awake when you’re on a call, using email, listening to music, browsing the web, or sending and receiving text messages, or during certain background tasks such as auto-checking email.
I'm still not convinced you read the links so here's what Apple has to say in terms of fine tuning your battery life:
Optimize your settings
Depending on how they are configured, a few features may decrease your iPhone battery life. For example, the frequency with which you retrieve email and the number of email accounts you auto-check can both affect battery life. The tips below apply to an iPhone running iOS 5.0 or later and may help extend your battery life.
Minimize use of location services: Applications that actively use location services such as Maps may reduce battery life. To disable location services, go to Settings > General > Location Services or use location services only when needed.
Turn off push notifications: Some applications from the App Store use the Apple Push Notification service to alert you of new data. Applications that extensively rely on push notifications (such as instant messaging applications) may impact battery life. To disable push notifications, go to Settings > Notifications and set Notifications to Off. Note that this does not prevent new data from being received when the application is opened. Also, the Notifications setting will not be visible if you do not have any applications installed that support push notifications.
Fetch new data less frequently: Applications such as Mail can be set to fetch data wirelessly at specific intervals. The more frequently email or other data is fetched, the quicker your battery may drain. To fetch new data manually, from the Home screen choose Settings > Mail, Contacts, Calendars > Fetch New Data and tap Manually. To increase the fetch interval, go to Settings > Mail, Contacts, Calendars > Fetch New Data and tap Hourly. Note that this is a global setting and applies to all applications that do not support push services.
Turn off push mail: If you have a push mail account such as Yahoo! or Microsoft Exchange, turn off push when you don’t need it. Go to Settings > Mail, Contacts, Calendars > Fetch New Data and set Push to Off. Messages sent to your push email accounts will now be received on your phone based on the global Fetch setting rather than as they arrive.
Auto-check fewer email accounts: You can save power by checking fewer email accounts. This can be accomplished by turning off an email account or by deleting it. To turn off an account, go to Settings > Mail, Contacts, Calendars, choose an email account, and set Account to Off. To remove an account, go to Settings > Mail, Contacts, Calendars, choose an email account, and tap Delete Account.
Turn off Wi-Fi: If you rarely use Wi-Fi, you can turn it off to save power. Go to Settings > Wi-Fi and set Wi-Fi to Off. Note that if you frequently use your iPhone to browse the web, battery life may be improved by using Wi-Fi instead of cellular data networks.
Turn off Bluetooth: If you rarely use a Bluetooth headset or car kit, you can turn off Bluetooth to save power. Go to Settings > General > Bluetooth and set Bluetooth to Off.
Use Airplane Mode in low- or no-coverage areas: Because your iPhone always tries to maintain a connection with the cellular network, it may use more power in low- or no-coverage areas. Turning on Airplane Mode can increase battery life in these situations; however, you will be unable to make or receive calls. To turn on Airplane Mode, go to Settings and set Airplane Mode to On.
Adjust brightness: Dimming the screen is another way to extend battery life. Go to Settings > Brightness and drag the slider to the left to lower the default screen brightness. In addition, turning on Auto-Brightness allows the screen to adjust its brightness based on current lighting conditions. Go to Settings > Brightness and set Auto-Brightness to On.
Turn off EQ: Applying an equalizer setting to song playback on your iPhone can decrease battery life. To turn EQ off, go to Settings > iPod > EQ and tap Off. Note that if you’ve added EQ to songs directly in iTunes, you’ll need to set EQ on iPhone to Flat in order to have the same effect as Off because iPhone keeps your iTunes settings intact. Go to Settings > iPod > EQ and tap Flat.
Usage specs for the 4S - http://www.apple.com/iphone/specs.html:
Talk time: Up to 8 hours (12.5% per hour drain) on 3G, up to 14 hours (7.1% per hour drain) on 2G (GSM)
Standby time: Up to 200 hours (0.5% per hour drain)
Internet use: Up to 6 hours on 3G (16.6% per hour drain), up to 9 hours (11.1% per hour drain) on Wi-Fi
Video playback: Up to 10 hours (10% per hour drain)
Audio playback: Up to 40 hours (2.5% per hour drain)
So a scenario of normal usage could be for example: 4 heavy hours of 3G internet browsing (66.4%), with one hour of call on 3G (12.5%) and 22 hours of standby (11%) = 100%
A battery life issue is a problem where the drain is really out of spec either during usage or standby or both. For example, multi-% per minute drain during usage or a 10% drain per hour during standby is problematic. Browsing the internet on 3G during one hour and losing 16-17% is not.
Apple's test methodology for claiming the specs:
http://www.apple.com/iphone/battery.html
Procedures
davidch tips (reset+full discharge recharge):
Go through these steps to address the battery after updating to iOS 5.0.1:
1. Reset all settings (settings app-> general-> reset)
2. Go through initial setup steps (lang, wifi, siri, enable location, etc) and choose setup as new phone (don't worry your apps, data, contacts, mail will still be there). Do NOT restore from iCloud or iTunes (It can copy back corrupt settings)
3. Turn off system location services timezone and iAd
4. Fully discharge battery (tilll it shuts off with the spinning wheel)
5. Fully recharge battery (overnight if possible)
In my experience this improves the Standby battery drain issue significantly in most cases. It reduces drain from 2-4% or more per hr to 0.5% or less. It has worked for many, many users now. If it does not work after a few try's you may have a real battery or hardware issue and should contact Apple. Good Luck!
ram130's variant of davidch i.e. additional steps:
Now using davidch original steps and attaching the tweaks I made to get me more usage. As shown on page 29.
Go through these steps to address the battery after updating to iOS 5.0.1:
1. Reset all settings (settings app-> general-> reset)
2. Go through initial setup steps (lang, wifi, siri, enable location, etc) and choose setup as new phone (don't worry your apps, data, contacts, mail will still be there). Do NOT restore from iCloud or iTunes (It can copy back corrupt settings)
3. Turn off system location services timezone and iAd
4. Fully discharge battery (till it shuts off with the spinning wheel)
5. Fully recharge battery (overnight if possible)
6. Disable Siri 'Raise To Speak' and REBOOT *( if possible use another camera to verify the                 infrared is off after the reboot).
7. Set emails, icloud and calendars to fetch. ** test. Mines on hourly.
8. If your in a no signal and your phone is saying "Searching..." even after 10mins, reboot while in that area and after 1-2min it should say "No Service". This mainly applies to Verizon customers and improve battery life in these areas.
9. *optional* Goto Settings > General > Network and you will see "Hotspot.." loading something, wait a few seconds and it should say "setup personal hotspot" then exit out.
* I notice a great improvement after disabling this and rebooting. This increased my "screen on" usage or at least helped it. Make the change.
** I have not tested push yet to narrow down the drain but I had this change on my phone. I believe exchange push is responsible for some stand by drain. As for icloud, haven't notice much of a difference. Just try it for a day. My email still came in fast most times. Again still testing, will report back on these..
buxbuster tips(wifi sync, iCloud):
These are my own tested workarounds that worked for my iPhone 4S and seemed to have worked for others as well :
Workaround number 1. Deselect wifi-sync in iTunes and press sync.
If that doesn't work try :
Workaround number 2 : Remove iCloud, reset network settings. ( I guess this won't work for you since you don't have it enabled ).
If both workarounds fail, you can always try to completely wipe your phone. That also solved some of the cases out there.
rolandomerida tips - i.e. buxbuster and additional steps:
Finally, I solved the syncing error loop. My contacts are syncing flawessly again between my devices and iCloud, and yes, the battery stopped draining, which is the main topic here.
I followed instructions from buxbuster (check his workaround a few pages up!) and an additional BIG step to restore contacts and syncing, as seen in a MacRumors forum.
This is what I did:
1. Make a backup of your Address Book, using the vCard option (or both, it doesn't hurt). Save it for later.
2. In your iPhone, delete iCloud account. When it asks, accept both: delete AND delete from my iPhone.
3. Reset network settings. The iPhone will restart, then will ask you to unlock the SIM card.
4.Turn Wi-Fi on.
5. Add the iCloud account again.
That's for Buxbuster's workaround. For some, it might work just like that. My iPhone repopulated from iCloud after step 5, but I still had that "server error" on iCloud. I had to do some extra steps, since my Mac was not syncing to iCloud and couldn't edit anything on my Mac or iCloud. Syncing back had to be fixed, too. If not, the syncing loop would continue from my iPhone, and the battery would drain awfully again.
1. In System Preferences -> iCloud, I turned Contacts off. I chose "keep on My Mac" those contacts, but I got an empty Address Book after a while. And a few minutes later, iCloud contacts were empty and my iPhone also. It is scary at first! Now, before importing that vCard backup...
2. Turn Wi-Fi off. This is important, since your contact-empty iCloud will attempt to wipe your Address Book from your Mac in seconds after importing.
3. Import your vCard backup to Address Book. Just drag it to your blank Address Book window; it asks if you want to import "x" number of cards. Of course, say yes.
4. Turn Wi-Fi on, and then iCloud contacts on again (System Preferences -> iCloud). It will offer to merge your newly populated Address Book with iCloud (which is empty at this point). It should upload every single contact to iCloud, and then to your iDevices. If not, a fifth step would be to import the vCard file to iCloud, but it shouldn't be necessary.
So, with iCloud syncing working correctly, there is no battery draining! Again, that was my particular issue.
I can't tell if this is the single answer to the widely spread battery draining problem, but it sure can be fixed with these workarounds, and yes, Apple should address the problem with a future update, for we affected customers don't need workarounds in the first place
This is the MacRumors discussion:
http://forums.macrumors.com/showthread.php?t=1256807
And dont' forget to check buxbuster's fix, video, and THANK him!
Miless tips (full 800mb release of 5.0.1 and sanitizing a restore):
As for 4S battery life. Try doing this,
1. Settings>Location Service ... disable all location services you do not need. In particularly Facebook because it drains the battery a lot.
Scroll down to the bottom at Settings>Location services>System Services ... Disable Setting Time zone, location based iAds, Diagnostic & Usage.
2. Settings>Notification>Calendar ... turn off the Notification Centre.
3. Settings>General>Reset ... do Reset All Settings. Doing this will not wipe out your iPhone. It will just Reset the network settings, location warning, keyboard dictionary, etc... but it will clear up some corrupted data there. Generally this will help.
Try these 3 steps first... if it still drains a lot, try the following,
4. Drain your battery down to 1%. Then charge it up using USB from PC ... not the charger. The charger output 1.0 A ( x 5V from USB ... you get 5W power). From PC, output is only 0.5A x 5V = 2.5W power. Charging is slower but trickle charge 4S helps the battery retain its charge better. I think it takes about 3-3.5 hours to charge full from USB/PC compared to slightly below 2 hours using iPhone charger.
If after doing the above still could not solve your battery issues (mine with iOS 5.0 was ok up to step 4, but not iOS 5.0.1).... plug you iPhone to a charger (any charger), from iPhone, access your iCloud ... set it up if you havent. Back up your iPhone data to iCloud. if you do not have enough storage (only 5GB is free), go to details and select the apps you need its data backup, choose only those you really need and leave those unnecessary ones out. Back up your camera roll to your PC/Mac manually as it could be too big to backup to iCloud.... once you have it setup, make sure you are on Wifi ... tap backup to iCloud from your iPhone. It will take a while if the file is huge.
Once backup to iCloud is completed, plug your iPhone to PC/Mac and launch iTunes 10.5.1 (make sure you have 10.5.1)
Click Restore. It will automatically initiate a download of iOS 5.0.1 ipsw for iPhone 4S. Wait for the whole process to finish, ie. download, restore software/firmware.
Once its done, do not set up your iPhone from iTunes. Set it up on your iPhone. Go through the selection. When prompted, select restore from iCloud (from your iphone backup earlier). Keep your iphone plugged into iTunes while restoring backup from iCloud. Because while restoring from iClouds, some data will be synced from iTunes if you plug in, e.g. music, video, etc... unless you bought these content from iTunes store. Apps will be downloaded from App Store from the cloud.
Once it's all done restored. Turn off your iPhone,.. and turn it on again.
Now, hopefully your battery wont be draining so fast anymore. Usually it wont after this. But you need to charge your battery at least 4-5 cycles to stabilize the charge on the battery. I dont know why... but battery life seems to get better and better for me after a few charge cycles after all the above work.
Good luck. Let us know if it works for you.
W. Raider tips (Sirii):
Bottom line for me of things that helped battery life are:
1. Turing off Siri and Rebooting the phone by holding the Home button and Top button down, ignoring the slider, until the phone shut down. (turn off Siri, reboot, and check top front of iPhone 4S against a lesser camera like the front-facing camera on an iPad2 - making sure the IR sensor is off)
2. Fully draining the battery, meaning using the phone until it shuts itself off from a drained battery and then recharging it to 100% about 4, maybe 5 times. I charged it both with a Mac and a wall charger.
Hope this is helpful!
Comments
jmm514 remarks (Twitter):
I may have found something. I had Twitter disabled in my notifications, but got a tweet today that popped up on my home screen. Didn't know I had this enabled. At the bottom of the Twitter notification settings is the home scrren toggle. Since disabling this, battery life seems better. Considering there is no setting for frequency of checking for tweets, it appears the phone is continually connecting to wifi to check for new tweets.
tmksnyder comments (notifications, corrupt data in iCloud):
For me, I found my iphone on wifi mysteriously connecting to my mac. I eventually narrowed it down to the Apple Move Trailers app which keeps a file in iCloud. The phone was trying to sync the file with the mac in the background even when the Movie Trailers app was closed (hitting the red x). Based on my macosx logs the iCloud process that was trying to sync was working directly between the phone and the mac without using itunes by connecting to an https address hosted on the phone. It was connecting every 3 minutes and failing (while phone was awake or awake during during a notification). I also found that iCloud control panel on OSX would error if I tried to delete the file. I fixed it by removing the App and doing a hard reset which stopped the sync. I probably could have turned off iCloud document sync in the phone but didn't think of that. My battery life has greatly improved while at home on wifi.    I am now at 28 hrs standby, 2 hrs 20 minutes of usage, and 68% battery. It was ok before where I could get 20-30 hrs standby and 6 -8 hrs usage. My usage today was phone calls, 3g surfing, and music via bluetooth in the car.
I also found even with Itunes iMatch, if I mass updated tages, art work etc, it would hit the phone on wifi even in standby. I was amazed.   Granted if I am not doing updates, Match won't hot the phone so this was a once in awhile event. I could drop my percentage by 5-10% in a matter of minutes when doing updates.   I think a lot of our problems are background processes, associated with iCloud, notification, and apps. More features means more battery.   I think the key thing is to keep track of what has recently been added or changed if battery life gets worse all of a sudden.   It may be an app that was recently installed and if possible you may want to completely remove it and not just quit it.
With twitter, i think it uses push notifications so it doesn't need to be running and actively poll on the phone. For instance , if i quit the mail app, i still will get mail notifications and can swipe the message and load mail. Apple Push Notifications servics maintain the connection to the phone and there are likely pings or connection checks that occur for the service on an os level not an app level. This minimizes the load so there arent a bunch of apps all runing and constantly checking. The notification service , if it is contacted from twitter or another service with data, will check the settings you have registered to the with the apple push service and send the notification to your phone. No matter what, there is a drain with notifications. M hunch is once one application is configured to receive notifications, connection checking occurs betwen the push service and the phone so it knows where it is on the network. If it is implemented correctly, these checks arent frequent if you are still and more frequent as you move. The other drain is for when the noification hits and is processsed. If i get 9 emails over night, my screen just popped up for 20 seconds or so to process each message using battery. I would even think that just go from low power to turning n the screen uses more juice than if the device was already on and i get the message. On nights I get no notifications, I see a 3 or 4 percent drop. On nights with a number of notifications, i have seen up to a 10 percent drop. Besides notifications, wifi sync and icloud will poll on the local network and use up battery if the host computer is on and running itunes or trying to sync a data file that is corrupt (which i had with the apple movie trailers app causing my phone to drain). For me turning off wifi sync and remving a corrupt file in icloud solved my battery issues and I get over 24 hrs of standby with 6 to 9 hrs of use and this is with all the normal location services and push serivices turned on.
See http://developer.apple.com/library/mac/ipad/#documentation/NetworkingInternet/Co nceptual/RemoteNotificationsPG/ApplePushService/ApplePushService.html for more info. I think it has a good overview of how the notifications work.

Well seems like that rumor of iOS 5.0.1 is finally gone the way of the dogs since developers got a beta of 5.1. So as stated earlier in the master discussion-> I suspect if you are filling up this thread with false post or creating a master set of links to various post that are unreliable you are wasting your time. Press is not going to touch the story due to poor or inaccurate sources which may be links from the master thread. This can include inaccurate information, combination of conflicting post or postings from users which may not own the device. Reputable press organizations have policies that require discloser and strict rules about what is a reliable source for a story. It is clear that many of the post in the master thread, which are links presented here are questionable.
Sorry to say that postings taken without any analysis of their totality have been propagated via various sites, for example sites such as http://www.2012federalbudget(dot)com. (Do not visit but I suspect that this is not the 2012 federal-budget site you would expect based on analysis of the records. There are plenty of sites like http://www.2012federalbudget(dot)com propagating questionable post in these threads.) One site for example in the discussion thread used a self signed certificate, the site had a log in to allow users to enter their OpenID. Seems many of these sites are pop and drop drupel configurations.
So remember this is how the really bad rumor of iOS 5.0.2 got started, the 5.1 memory leak issue, iCloud Issues, call quality, address book, etc.
Some of the postings have been very comical, I think the latest now is a dropbox issue. Seems that the length of the previous thread has resulted in various app engines of some proxy servers/tools reaching their limits.
So I would make sure to know the source of any information you link to. Make sure you avoid entering any information to outside links such as OpenID or Apple ID, these are big prize items for anyone with malicious intent. If you have issues and are a valid user contact APPLE CARE. (Note link is using McAfee Secure Short URL Service, and is https.)
http://mcaf.ee/ricdt
The original solution still represents a high level of success for users having any battery issues.
Install 5.0.1 on your iPhone 4s. Some users posting they are still using older versions, bad fake serial numbers, etc.
Make sure your device can run iOS 5.0.1 and is not altered.
Make sure you use a new Sim, not some cut down version which many users admit to doing. (Again, worth confirming what people are posting.)
Reset the device doing a hard reset and software reset.
Let battery drain and then charge for the full cycle, which is 24 hours.
I think you will find you will get the battery usage that APPLE has stated for the device.
Best of luck, stay safe and thanks

A1281 is the battery i got for my 15inch MBP. Is the battery life only 2 - 3 hours for a new battery on this device.

A1281 is the battery i got for my 15inch MBP. Is the battery life only 2 - 3 hours for a new battery on this device.
This is from Apple.
2 to 3 hours seems very low.
what is teh standard or advertised spec for a 15 inch Macbook Pro with this battery.
I would like to know so that i can return it if this is not normal.
Its expensive so comments would be appreciated.

I say it depends on your model? average usage is about 3-4 hours depending on what you use and how you use it. Adobe Flash player eats a lot of battery power so if you are on a web page and has flash player, likely that it's eating up battery because of it's power thirsty.
Also check your systems activity monitor. It could be possible that one of your program/apps did not close right and may be still running. So check for that and end the process if necessary.
If you have a backlight keyboard, in a broad daylight, it's not necessary to have it on.
I also suggest that you use it plugged in most of the time, and it's not going to hurt or damage the battery if you have it plugged in all the time. Only use on battery if you are going to places that has no access to the outlet. If you are at home, then keep it plugged in. Just keep in mind to fully drain the battery until it your MBP turns off on it's own. This is the calibration process so that you have the most accurate battery readings.
The standard for 2011 MBP is 7 hours on battery. Before that model is 10 hours, but i don't believe that previous models will last 10 hours. Last week I calibrated my battery readings from fully charged and it took 9 hours to completely drain out the battery (I have a 2011 model),
If you think it's not normal and that your battery doesn't meet your expectation then set up an appointment with the genius bar and have them test the battery. They will determine whether it is faulty or not.

MBP early 2011 battery life

I have the early 2011 release of the 17" MBP (8gig ram, 2.2ghz quad i7, 500 gig harddrive) and it seems like the battery life has just been cut inhalf. It lasts me about 3 and a half hours from just general use. Is my battery faulty? Really appriciate any feed back

That battery looks pretty good, capacity is really strong for so many charge cycles, but the voltage looks low, would expect it to be in the 11.5 to 12.5 volt range and you are showing 11.27 volts. A little low but not critical.
How have you been handling that battery with respect to discharge/charge? While Apple has a lot of material talking about periodic deep discharge to shutdown and charge as a means of calibrating the battery, in reality that does not calibrate the battery itself. That only serves to calibrate the charge reporting circuitry built in to Lithium-technology batteries. In fact, the Battery University, an independent group testing batteries, has shown that repeated deep discharge behavior significantly shortens Lithium battery lifetimes. The optimum balance of use (discharge) and line-connection seems to be around 50% discharge before charge. Deeper reduces cycle life very fast, lower discharge makes for a very high cycle life but why buy a portable?
Anyway, just some thoughts. Use of high intensity applications, including other operating systems, looks like it is degrading the charge time but the battery itself looks healthy.
Just keep using it, perhaps try not discharging below 50% for a while and see how it behaves for your.

IPad2 Battery Life Expectancy

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