Using ac adaptor with battery

just wondered- if ac adaptor is plugged in, once battery is fulluy charged, does the battery cut out and all power is received from the ac adaptor

Based on my experience no. However, you can remove the battery anytime the machine is plugged in without ill effects (other than if the A/C should suddenly lose power). You will though find that cycling the battery charge and draining it following these directions can prolong its life:
http://www.apple.com/batteries/
Consider having power via A/C and battery a sort of backup. If the power should be lost when a file is being created, you may not be able to recover it.
If the power should be lost while the operating system is running the directory may get damaged*:
http://www.macmaps.com/directoryfaq.html
So is it good to have both plugged in at the same time? Some would argue one way or the other based on both of the above being true.
- * Links to my page may give me compensation.

Similar Messages

Underclocking CPU and using only AC with battery attached

Is it possible to underclock the CPU and use only AC but with the battery attached to the MBP? If the magsafe connector is unplugged the MBP can switch instantly to use the battery.
There are many times when an underclocked MBP is enough, like when browsing the web, writting and listening to music. But using only AC with no battery is risking losing information.
And, if it's possible it can even be an option in the menubar (along with turning off-on WiFi and bluetooth). This way, if more power is needed (ie: running Corel's Painter X), it's a matter of just click underclocking-off.

A question remains: Why do you want to do this?
Do you want to maximise the life of your battery?
Do you want to develop sophisticated software that cares about power usage?
Do you care about the planet and want to minimise your ecological footprint?
As far as "an AC adapter that takes the place of the battery and can power the MBP with enough energy" - it is supplied with your computer and is the common or garden variety 85W powerbrick. Furthermore, when the AC is connected "the battery will never be used when not necessary" (only if the power demands are sufficiently high that the power adapter can't supply all the power required) - just as you desire.
Just to make it clear - when the AC is connected the computer draws its power from the AC first, regardless of whether the battery is in place or not.
I think you will achieve what you want by using the MBP normally, as designed, and not doing anything special. I think it is designed to do exactly what you seem to want.

Use power adaptor or battery

When to use which (Macbook Pro)? Use the battery at all times and drain then recharge or just when an outlet is not available?

That was copied and pasted from the article named above under the sub heading "Standard Maintenance". I did read that. But that does not really describe how I use the computer. I do not travel with it much. I use it more like a desktop. I purchased the notebook because of it's small footprint and portability. I use it in various places around the home on a daily basis. Wherever I am there is an electrical outlet handy. If I follow the principal of discharging and recharging once per month then I would be using the power adaptor almost constantly. Is this truly recommended?

HT1665 Why don't I get FM radio when using lightning adaptor with my ipod?

I've got a 7th generation Nano. Using the Apple Lightning adapter for my dock, I get no radio reception. What's going on?

You need to have your headphones inserted - they're the aerial.
I've tried a variety of headphones and they all seem to give reception. Not sure how you're affected when using your dock ie whether you can still have earphones inserted. You may need to get a double male cable and insert one end in the ipod and one in your dock (if it has that facility).
M.

New Mac's battery charge percentage drop quick using AC adaptor 24/7, should I be worried?

I use my mac with AC adaptor 24/7, but the battery capacity drop 4% in 3 days... should I be worried? Is it some kind of hardware problem?

Hi,
Well, it's only England, so no extreme temperatures, but I can see my breath in the morning when the heater hasn't been on! I didn't think it would be too cold, but seeing some other posts wondered if that could be a contributing factor, being the unusually cold weather here over the past two/three weeks.
I'm just panicking in case my battery or charger is about to go, just when I really need them.
I'll calibrate the battery -- which is something I wasn't aware of until reading this forum today.
The problem is, I'm traveling to the Caribbean to the opposite temperature problems may arise -- to hot and humid. I think I'll buy an extra battery to be on the safe side.
At least neither of you has said: 'oh dear, that sounds like a failing battery.' So I'm a little less panicked now. I'll keep an eye on it and post back if anything dire happens over the next few days.
Thanks for taking the time to respond.
Cheers,
Tracy

I am using my Ipad on a remote craftshow site and am having problems with battery lasting 8 hrs. Can I use a 12v rv battery to recharge it or atleast maintain the charg over longer periods of time? I have a dc adapter. thanks

I am using my Ipad on a remote craftshow site and am having problems with battery lasting 8 hrs. Can I use a 12v rv battery to recharge it or at least maintain the charge over longer periods of time? I have a dc adapter. thanks

You should be able to use the battery if you get a car type charger which recharges mobile devices.
The full size iPads use a 10-12W charger, whereas the mini uses a 5W charger. Many car chargers only supply 5W. But at 5W, the car charger should give you some extra time on your iPad. It would be best to use a 10-12W car charger.
 Cheers, Tom

Can I use a 85w adaptor with my (60w) MacBook Air?

I have an old MBP and a new MBA. Can I use the old 85w adaptor with the MBA?

crh24 wrote:
The question to be answered is pretty simple:
"Does the increased output cause a high enough rise in temperature to shorten the life of even one of the components in the charger?"
If the answer is "yes" then do so at your own risk. If the answer is "no", then it is safe to do so and all you face is a longer charge time.
As users with no insight into the design specifications of the charger we have no appreciable method to determine the answer to that question. Therefore I hold the position that I will use a lower powered charger only if forced by circumstances to do so. I will not do so as a 'routine' method of charging my devices.
Ohms Law has not been repealed!
An 85w supply connected to a 60w load will output 60w, somewhat less than it is capable of and no more than the load (your Mac) needs.
The reverse case is that a 60w supply connected to an 85w load will output 60w, less than the load needs (but more than enough to operate) and 60w is the design output so the supply will be just fine.

I would to know what is the better option, mac book pro with CA on, or use with battery until it`s discharge

I have one doubts if is preferable work with mac book Pro all together with battery and to connect it when discharge or work with the connected to CA cable.
I read in somewhere apple do not recomended work with the CA cable all the time, but in other articles said that its no problem if you realize a complete cilce of discharge an charge one time at month,
thaks for help

Keep it plugged in when near a socket so you keep the charging cycles down on your LiPo (lithium polymer) cells / battery, but not plugged in all the time. When not being used for several hours, turn it off.
And best "tip" is if its near a socket,...plug it in as long as you can (especially at home) since cycle count on the battery are the "miles that wear out the tires (battery)", however again, not plugged in all or most of the time.
http://www.apple.com/batteries/notebooks.html
"Apple does not recommend leaving your portable plugged in all the time."
General rule to remember of Lithium batteries is:
Never drain them LOW & never store them HIGH
While cycle count is commonly seen to be the “miles” on your Lithium Ion pack cell in your Macbook, which they are, this distinction is not a fine line at all, and it is a big misconception to “count charge cycles”
*A person who has, for example, 300 charge cycles on their battery and is recharging at say 50-60% remaining of a 100% charge has better battery usage and care than another person who has 300 charge cycles at say 15% remaining on a 100% charge.
DoD (depth of discharge) is far more important on the wear and tear on your Macbook battery than any mere charge cycle count. *There is no set “mile” or wear from a charge cycle in general OR in specific.    As such, contrary to popular conception, counting cycles is not conclusive whatsoever, rather the amount of deep DoD on an averaged scale of its use and charging conditions.
(as a very rough analogy would be 20,000 hard miles put on a car vs. 80,000 good miles being something similar)
*Contrary to some myths out there, there is protection circuitry in your Macbook and therefore you cannot overcharge it when plugged in and already fully charged
*However if you don’t plan on using it for a few hours, turn it OFF (plugged in or otherwise) ..*You don’t want your Macbook both always plugged in AND in sleep mode       (When portable devices are charging and in the on or sleep position, the current that is drawn through the device is called the parasitic load and will alter the dynamics of charge cycle. Battery manufacturers advise against parasitic loading because it induces mini-cycles.)
Keeping batteries connected to a charger ensures that periodic "top-ups" do very minor but continuous damage to individual cells, hence Apples recommendation above:   “Apple does not recommend leaving your portable plugged in all the time”, …this is because “Li-ion degrades fastest at high state-of-charge”. This is also the same reason new Apple notebooks are packaged with 50% charges and not 100%.
LiPo (lithium polymer, same as in your Macbook) batteries do not need conditioning. However...
A lot of battery experts call the use of Lithium cells the "80% Rule" ...meaning use 80% of the charge or so, then recharge them for longer overall life.
Never let your Macbook go into shutdown and safe mode from loss of power, you can corrupt files that way, and the batteries do not like it.
The only quantified abuse seen to Lithium cells are instances when often the cells are repeatedly drained very low…. key word being "often"
The good news is that your Macbook has a safety circuit in place to insure the battery doesn’t reach too low before your Macbook will auto power-off. Bad news: if you let your Macbook protection circuitry shut down your notebook at its bottom, and you refrain from charging it for a couple days...the battery will SELF-DRAIN to zero (depending on climate and humidity)…and nothing is worse on a Lithium battery being low-discharged than self-draining down to and sitting at 0
Contrary to what some might say, Lithium batteries have an "ideal" break in period. First ten cycles or so, don't discharge down past 40% of the battery's capacity. Same way you don’t take a new car out and speed and rev the engine hard first 100 or so miles.
Proper treatment is still important. Just because LiPo batteries don’t need conditioning in general, does NOT mean they dont have an ideal use / recharge environment. Anything can be abused even if it doesn’t need conditioning.
From Apple on batteries:
http://support.apple.com/kb/HT1446
Storing your MacBook
If you are going to store your MacBook away for an extended period of time, keep it in a cool location (room temperature roughly 22° C or about 72° F). Make certain you have at least a 50% charge on the internal battery of your Macbook if you plan on storing it away for a few months; recharge your battery to 50% or so every six months roughly if being stored away. If you live in a humid environment, keep your Macbook stored in its zippered case to prevent infiltration of humidity on the internals of your Macbook which could lead to corrosion.

U430 - How to use properly with battery?

Is it o.k to conect the charger to the computer constantly?
I mean, there is switch that when the battery full load it charge directly the computer?
I ask because most of the time my computer on my table and I don't know if it's good to conect it to the charger constantly or everytime it is full disconect the charger.
Thank's!

A laptop computer battery should last between two and four years, or around 1,000 full charges, i have mine always connect to power when at home and the battery now holds about 50% charge it is 7 years old and well exceeded my expectations on life of the battery
now days it all about storing the battery
Fully charge new batteries before use.
A laptop battery’s health deteriorates the more you charge and discharge it, running it from a power source will make your battery remain in a state of charge/recharge. Instead, when your battery gets to near 100% charged, unplug it from the power and plug it in again when it is low.
Heat will dramatically affect battery life for both batteries in your laptop and spare batteries you have stored. Keep spare batteries in a cool place and try to make sure that your laptop has plenty of ventilation so that the battery does not get too warm.
Keeping the laptop cool will also reduce the need for your fan to run which also uses more battery power.
If you are using your laptop as a desktop replacement, consider removing the battery and just running the laptop directly from the power source.
Store spare batteries or if you not going to use it for a week or so with approximately 40% charge, batteries even when stored will discharge over time.
Adding more RAM to your laptop will actually decrease battery consumption as RAM will be used rather than your hard drive to run resource intensive processes.
Your hard drive is a mechanical device and is a significant power hog.
Try to minimize CD/DVD drive use. As with your hard drive, your optical drives are a mechanical device that will consume a lot of power when in use.
hope this clears a few things up
Thx dave
yoga 2, lenovo b540
3 custom gaming pc systems

I have recently update to the OS Maverik and I use a projector with a mini display port adaptor to my MacBook Air, ever since the only thing that projects is my desktop picture. I cannot get it to project my school work that I need to teach my students.

I have recently update to the OS Maverik and I use a projector with a mini display port adaptor to my MacBook Air, ever since the only thing that projects is my desktop picture. I cannot get it to project my school work that I need to teach my students. Help!

Hi Becki514,
Welcome to the Support Communities!
The following articles may help you with your projector issue:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
http://support.apple.com/kb/ht3382
Mac notebooks: How to use your computer in closed clamshell (display closed) mode with an external display
http://support.apple.com/kb/ht3131
I hope this information helps ....
Have a great day!
- Judy

Used wrong charger with ipod classic, now it wont turn on, displays the low battery icon even though its connected to the wright adapter

used wrong charger with ipod classic, now it wont turn on, displays the low battery icon even though its connected to the wright adapter.
Can anyone help ?
please?

WHow long have you left it to charge? Have you tried resetting it after a short period of time to see if that can help jumpstart the charging process? To do this, press and hold both the Select/Center and Menu buttons together long enough for the Apple logo to appear.
B-rock

Why mu brand new macbook air always black screen while i use it with battery?

why mu brand new macbook air always black screen while i use it with battery?

Press F2 key couple of times.
Reset PRAM. http://support.apple.com/kb/PH4405
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Is the battery charged?
You can return a new Mac within 14 days of purchase.
A new Mac is in warranty for 1 year from the date of purchase.
A new Mac comes with 90 days of free tech support from AppleCare.
AppleCare: 1-800-275-2273
Call AppleCare.
Best.
Best.

When i Using 3G internet The battery is reducing very fast. maximum I can Use 2.30 Hours with internet using. Is this possible ?

When i Using 3G internet The battery is reducing very fast. maximum I can Use 2.30 Hours with internet using. Is this possible ?

How long are you using internet for? Are you using WiFi or mobile data? Are you watching video on websites? There are many variables that could explain a perfectly natural battery drain. As I said previously you should try recalibrating the battery. My phone used to drain by mid-afternoon with little to no use until I found out about recalibrating. Since then its been fine and its something I do at least once a month.

Use nano with battery charger after battery has died?

Hello
I am wondering if it is possible to use the nano with the battery charger plugged into it after the battery in it has been used up? Because the battery seems to decay pretty fast and my primary reason to have the nano is as an input to my amp...
Thank you.

yes this ok to do. I do this all the time when I am listening to tunes at home. It saves the battery from discharging as quick
jid

Power adaptor and battery HOT!

This is the message I sent to Apple a few minutes ago. Maybe some of you can have some answers as well. Thanks!
"Dear Apple,
First of all, I would like to kindly express my apologies for using the feedback form to send you some thoughts about my MAC. I did not know who else to address to.
I have bought my MAC in September 2009, through the Apple Store online. It has been delivered in Norway, where I am living in the present.
Unfortunately, I have never been very satisfied with it, due to two main issues.
First, I have noticed a problem with the battery and power adaptor since the very first day. They are both heating up very fast, after just some minutes, and then the mac is really, really slow (even if I have just one open application). I have tried a few times to go to a service provider in Oslo, but they said it's working fine. The first time I had a visit with a service was in the first week after I bought it. Then, when I had this screen problem, so I took advantage and I asked them to check again the battery (they had it for a week or two). They said it was fine. A few weeks ago I visited 3 different services with the same issue - no problems found.
Of course one could say that this is the proper way of working of a mac, but how can a mac work so slow when they all say it is so fast? I have asked around and none of my friends had a similar problem, since they've purchased it.
I decided to write you now due to the fact that a few days ago I had to use a friend's mac for some hours (which is older than mine, a simple MacBook; plus, he uses it much often than me). It was working perfectly! Not at all slow, no heating.
Then yesterday I had my power adaptor plugged in for half an hour - then I saw that the mac was not charging (how come?). When I touched the power adaptor, I literally burned my finger. Of course I got scared as well. I tried to change the power adaptor with another one - it did not get so heat up, but the battery of the mac was still burning, as usual. I used to keep my old PC in my lap, with the mac it was always impossible, unfortunately.
With lots of regrets I am writing this message. I have never felt that I had a 'real mac', like the other friends of mine, although I was so excited in the beginning. I sincerely hope that I am a unique user.
Now I am planning to sell it to someone (I don't think I can get even half of the price now, since it is pretty old) and get back to some usual PC. With all the regrets in the world, again, because some of the features were indeed really cool (like the trackpad, for eg).
Thank you for reading this! Good luck with your future products! And may God rest in peace Steve Jobs, I hope the business will not be affected.
Best regards,
Cristina Moldovan"

45W is definitely not correct for any 15" model. Here are the correct model power adapters:
http://docs.info.apple.com/article.html?artnum=75448
Yes it can hurt and potentially create a fire hazard if you use the wrong adapter. Get the correct one.
As for the display resolution the 867 Mhz TiBook was released on this release as a:
http://support.apple.com/specs/powerbook/PowerBookG41GHz-867MHz.html
1280 x 854, 1152 by 768 supporting display. Check the inside of the machine's battery bay to verify it is an M8858LL/A. If it isn't then this might be a bit of a Frankenmac.

Using ac adaptor with battery

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