About The Power Adapter

I use my macbook as my primary computer at home and in college. When I am using it at home or in my dorm, I always leave it plugged into the power adapter.
My question is, does leaving the computer plugged into the power adapter while in use and with a full charge keep power flowing through the battery or is the power taken strait from the adapter source. If the power is run through the battery, does it damage the battery to leave it plugged in that long. Should I change any of my charging habits?
Thanks.

The charging circuitry automatically stops charging the battery when the battery is fully charged. It will not turn back on until the battery's charge level drops below 93-94%. No damage is done to the battery. Removing the battery while on AC power will only result in the computer dropping the CPU's buss speed.
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
MacBook and MacBook Pro- Mac reduces processor speed when battery is removed while operating from an A-C adaptor
Battery University

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Question about the Power adapter

I just got my Macbook and I love it but I'm a bit confused as to the function of the power adapter. I plugged it in and it started to charge my battery. Is this supposed to happen? I thought the function of the adapter was to provide continuous power from an outlet supply. Maybe I'm under the impression that the second cord I received with my macbook is a power supply cord. Is it?

Also You can run the computer without your battery in but I believe it's not good for the computer.
This link explains the point you were making. MacBook reduces processor speed when battery is removed while operating from an A/C adaptor

The power adapter gets very hot. Any suggestions?

The power adapter part that plugs into the computer gets very hot. I have replaced the battery and replaced the power adapter. It also has a hard time connecting and recharging the battery. Is it possible to change out the plug in part in the computer and is it expensive? Does it sound like this is what is needed to fix it? Its about 3 years old. Any suggestions would be appreciated. Thanks.

Hot is normal for the charger but very hot is not. If it were mine It could be that your MBP is drawing too much current. I would take it to the Apple Store and have it checked out.
Allan

Noise on audio output when using the power adapter

I'm a musician and use my mid-2007 MBP 15" in my live rig. When I use the power adapter, I hear a buzz, sometimes accompanied by a slightly louder buzz that cycles on & off about 1x/second. There are a few weird things going on here:
1. The buzz does not happen all the time. That leads me to think it may be noise in the AC line that the adapter is plugged into.
2. The noise is heard when I use both the built-in audio output AND an external USB audio interface.
In any case, when I disconnect the power adapter and run my MBP on battery, the noise goes away completely. I can probably do this on most gigs, but I'm a little nervous since I run a FW drive, an external USB audio interface, and my midi keyboard (powered by USB) so I am putting a little heavier than usual load on the MBP's battery.
As I said, this may be a noisy AC line. Another guess is that it's the PMU inducing noise into the audio circuitry. I'm hoping a simple AC line filter can help me but I thought I would ask here first in case anyone else has dealt with this. TIA for any help!

I had a similar problem and fixed it with a $5 universal travel adapter. Yours might be different but here's my situation. Try it for little cost and see if it works.
I'm also a muso with an iMac running external KRK speakers via USB Mbox2. Previously I had a Macbook Pro and the same audio problem. I've been putting up with a very low volume, high pitch noise until now. I simply plugged the Mac power cord into a universal travel adapter which then goes into the wall. For Aussie users there is an adapter on ebay that will allow a 3 pin Aussie plug to go into female side and has a two pin Aussie male on the other. For US users you can probably get the same although there is a 59c product that will do the trick called a ground lift adapter. Applecare actually agreed this was the best fix and confirmed there would be no problems with power supply or Mac performance. What a gem ! God knows I've looked into all kinds of alternatives that could have cost hundreds instead of $5.

Where can I find a replacement for the power adapter tip?

I need to replace the small adapter that allows the power adapter to be inserted into a socket. Does apple sell this part separately?
The adapter itself works fine. But the tip that gets inserted into the adapter, and then the wall, has started to make sparks. I'm afraid it's going to catch fire, or cause a fire. When plugged into the wall, I hear sparks and I see smoke coming out. If I adjust it's position by slightly withdrawing it from the wall socket, so that there is minimal contact, the sparks stop. But I am a little worried now that I can't leave my MacBook Pro retina plugged in without risk of fire. This started about a month ago after two years of use without any issues.
To be clear, I'm not talking about the adapter itself, but the tip that gets inserted into the adapter, and in turn allows the adapter to be inserted into a socket.
It seems wrong to shell out $80 for a whole new adapter when all I need to replace is the wall adapter.

What about the world travel adapter
http://store.apple.com/us/product/MB974ZM/B?fnode=MTY1NDEwMQ
The Kit is designed to work with iPod, iPhone, iPad, Apple MagSafe Power Adapters (for MacBook and MacBook Pro), Portable Power Adapters (for iBook and PowerBook), and AirPort Express.

Is the power adapter rated 100-240v for the HP Stream 13 Laptop ?

Hi,
I want to buy it. and i want to be shore about the voltage...
.....Is the power adapter rated 100-240v for the HP Stream 13 Laptop ?
Thank You.

I might have tested it myself a few months ago, I cannot remember the results but I believe booting from the SD slot is not supported by the UEFI firmware. It is mentioned here in the comments of this Amazon review for the Stream 11: "I have not been able to boot ANYTHING from the micro-SDXC slot. I can install Ubuntu on it, but I cannot boot from it. I don't know if booting is even possible."

Using my macbook pro whole day with the power adapter , will it affect my battery? Please help

Using my macbook pro whole day with the power adapter , will it affect my battery? Please help

It doesn't affect the battery. You can use your MacBook Pro plugged in all the time without damaging the battery. You only have to be sure that you unplug it and run a battery cycle (drain the battery without letting the Mac turn off and charge it fully) at least once a month to keep the battery life.
If you want more information about your battery > http://www.apple.com/batteries/notebooks.html

If I always have my MB Pro plugged into the power adapter. . . .

If I always have my MB Pro plugged into the power adapter, will my battery still wear out as it would if I were depleting and recharging it daily?
I tend to find a power outlet anywhere that I go in order to run my MB Pro on the adapter rather than using battery power. It's a habit that formed while using my 6 year old Powerbook G4 with about 5 minutes of battery life per full charge.
I understand that it shouldn't wear out to the same extent as running the battery down constantly, but is there still a significant effect?
Does the adapter bypass a full battery and power the computer directly?
I feel like an idiot asking this question, but I am really curious.
Thanks in advance for your responses.

Various yes and no takes on it:
[http://news.tigerdirect.com/2008/02/08/fact-or-fiction-leaving-your-laptop-plug ged-in-all-the-time-will-harm-your-battery>
[http://forum.digital-digest.com/showthread.php?t=83889]
The official Apple stance (which I take to be a "don't" leave it always plugged in):
http://www.apple.com/batteries/notebooks.html
However, still more takes on the issue:
http://discussions.apple.com/thread.jspa?messageID=9867559
[http://www.google.com/search?q=leavelaptop+plugged+in+permanentlysite:apple.com]
Message was edited by: Limnos

Verizon Westel 327W abroad - Buzzing sound from the Power Adapter ?

So I moved to Caribbean Islands for schooling and the DSL Modem from local company here was plain 1 port one. The voltage here is 220V, so I have put a transformer and then plugged my Westel 327W into 110V and it works great.
However, I am noticing a buzzing sound from within the power adapter. The adapter is running somewhat hot since I plugged it in a few days ago. Should I be concerned about this buzzing sound or is it just that its sitting on my desktop and I am noticing it now ? Its loud enough to be heard in a completely quite small room....
Thanks

Hi D_U, sorry to hear of your issue, sounds electrical and thereby out of my scope of support.
Constance
Verizon Telecom
Fiber Solution Center
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What to do about the power?

hi guys.
Just wondering which is the best overall way to use your laptop battery and power adapter.
For example. If i am using my laptop at home for a long period of time, the power adapter is in, and the battery will be fully charged. Is that ok? or should i use the battery up, and plug back in....i just don't know.
Would be help if you guys could give some feedback on this and what you guys do for best performance.
Thanks,
Mark

Ultimately you should do what you like.
For maximum battery performance though all you need to do is…
1) Use your MBP on battery on average about an hour per day. For the best longevity your should aim to have around 300 cycles on the clock after around 2 years. If you can do this then you battery will perform as well as it's going to at that age. Don't be afraid to have more cycles than this as well.
2) Calibrate once every 4 to 8 weeks. While this does help the longevity of your battery it does help you correctly monitor the state of your battery's health.

Macbook Pro gets really hot including the power adapter

Hi Guys,
Good day to you all!
I just have an inquiry about my recently purchased Macbook Pro 15-inch (non-Retina). On the first 2 days of using it by just running Mac Mail, Safari, and iTunes, it's temperature is really acceptable. However, on the 3rd day, the base of the Macbook Pro was really hot, including the Power Adapter. I even noticed that the fan was making a loud noise, just like a jet engine (just being exaggerated). But the fan activity is really unusually loud. When it got that hot, I was doing Skype with my wife, playing music in iTunes, copying photos from an external hard drive to iPhoto, and using Facebook in Safari.
What I did was I unplugged the power adapter, and let the battery reach 0% until it automatically goes to sleep. Then I will be charging it while it's off as part of the battery calibration link that I've found at the Apple support page. Also, I did the SMC reset.
I was just concerned because I don't know if I'm going to ask for a one to one exchange since it's still within the 14days return period for Apple Online Store purchase.
I hope someone can give me a suggestion and other recommendations to sort out the heat and fan issue.
Best regards,
Aris

It could if the camera wasn't properly wired and the camera was used a lot, or if the Skype software accessed the graphics chip a lot and the graphics chip was somehow damaged. A cooling pad is not a bad idea. But heating issues with Macs that present themselves with automatic shutdown are about the only one's I'd really get concerned about for the Mac. The notebook is not a laptop, and a cooling pad makes sense mostly if you are going to use it as one. Cooling it down would certainly help it regardless. If you notice a difference in performance with it, that might be worth while checking the hardware test mentioned on my tip and taking it in for. Do get AppleCare before it is a year old. That way you can bring it in and get the hardware fixed up to the third anniversary of buying the machine.

Is it better to use my Pro with the power adapter plugged in or out?

After charging my MBP's battery to 100%, which is better?
- keep the power adapter plugged in to the laptop and resume using until you want to turn off the laptop
OR
- because the battery is already at 100%, unplug the adapter and resume using until you feel like you should charge the laptop again (maybe around 80%-90%)

If you are convenient to an AC outlet it's fine to use the adapter. However, keeping the AC adapter connected will not have an adverse affect on the battery. Once the battery has been fully charged it will stop charging. Recharge will begin once the battery's charge drops below 95%. LIthium-Ion/Polymer batteries do not exhibit memory effects. See the following:
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
Battery University

Is the power adapter in the world travel kit identical with the one in the world travel kit?

I was told that to charge my Ipad2 in Europe I need to buy the world travel adapter kit - with the apple power adapter that looks the same as the one that comes with the Ipad2 - plus the adapter plugs. I do not need any more adapter plugs - have lots of those and multiple ones for Europe. So why am I being told by Apple store people that I must buy the "kit" for $39 when I already have a power adapter that is 110-240 . I can see taking a second power adapter - in case something happens to the original one- but why am I told that the power adapter in the kit is "different"? If so - different in what way?

To follow up: I'd put my apartment number (there are about five hundred at this address) in my address information (or Apple pulled it in with the information that goes with my Apple ID), but the number didn't make it into the shipping label. Calling DHL got the apartment number added, and they will attempt delivery tomorrow.
So calling DHL was the thing to do. I even grudgingly admit that having me make the call provided the information needed to close the case.
Two residual complaints: Apple/DHL should have formatted the address label correctly. And, DHL should have registered a shipping exception, which should have gone to Apple (or me), so I could have been told of the problem two weeks ago.

Can I replace my power adapter for free within warranty for the hook which is used to coil the cord on the power adapter is broken.

Can I replace my power adapter for free within warranty for the hook which is used to coil the cord on the power adapter is broken when fall down.

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Stop the sleep blinking light in lenovo g-470, whining sound from the power adapter , HEEEEEELP !!!

Hi, hope anyone can help me.
I own a lenovo b560 and a g470, the sleep light will blink when I go to sleeping mode, anyway the problem is not the light, the problem is the whining sound it produces the power adapter when the light start blinking, in both machines I hear that whining noise, but in the g470 is much louder, I don´t know if this is because I have a faulty adapter or something, the strange thing is that both adapters make the noise when I sleep the laptop, when I turn off or hibernate the whining sound disappear.
Also, I notice that the whining sound alternate in 2 types of sounds, one is high in pitch and the other lower, the high pitch is when the blinking light turn on when go to sleep and the lower pitch of the sound is when the light go off, and that is repeating until I resume the laptop, it´s very annoying, especially when I´m in a quiet room.
So my theory is that maybe somehow I can turn off the blinking light when the laptop goes to sleep and then maybe the whining sound will go away, but I don´t know, it´s only an a idea.
Any help will be appreciated.
Thanks !
Solved!
Go to Solution.

I can really understand your pain with this issue.
Kindly update the BIOS and display driver from the lenovo website then check if the issue persist.
The issue should be resolved after this.
Best Regards,
Tanuj
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About The Power Adapter

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