Is it better to run the macbook pro with the battery charger plugged in at all times or wait for the power to run out and then re-charge it fully?
- Asked by Sanaa F from Thornhill
- Oct 1, 2012
- Flag as inappropriate (Is it better to run the macbook pro with the battery charger plugged in at all times or wait for the power to run out and then re-charge it fully?)
6 Answers from the Community
If you can be bothered charge the battery fully, disconnect and then let it run out until 10% and repeat the process.
This will increase the battery life and performance by a few years! compared to;
Keeping it plugged in all the time wears the battery down and it will only serve at it maximum proficiency for around 2/3 years then slowly start to degrade.
- Answered by Ruslan R
- Feb 12, 2014
- Flag as inappropriate Answer 1
It is scientifically proven that Li-ion batteries last longer when "cycled" from 0%-100%-0%-100% (rinse and repeat). Here's why: Think of batteries like a tank full of, we'll call it, juice. When the "juice" stays full or in our case plugged in, the bottom portion of juice begins to crystallize. Once crystallized, that part of the battery is effectively dead. Your battery meter might say 100% when in actuality, the device is really saying "100% of the LIVING portion of the battery". Likewise, if you always fill your tank to 80%, the top 20% of juice will crystallize.
So two rules here... Always charge fully, and always drain fully.
One more thing. Sometimes, we humans forget rules like this. If this happens, charge your battery fully next time around and let it charge 2 or 3 hours past full charge. Sometimes, this can recover some "dead" cells that are only partly dead (thank you billy crystal). If you do this religiously, you can actually get a battery that reaches 110% since batteries are typically measured with 100% as being slightly below capacity.
Hope this helps!
- Answered by Drew C from Nashville
- Feb 18, 2014
- Flag as inappropriate Answer 2
I think if you kept it on charge perm the batterys will be killed
Wait for the popup for battery life then plug it in
- Answered by Andrew S
- Feb 12, 2014
- Flag as inappropriate Answer 3
Lithium ion battery life is primarily determined by the number of charge cycles. One charge cycle, as defined by Apple, can be consumed by running the battery down from 100% to 0% once, or by running it from 100% to %80 five times. Discharging a battery completely was advisable for some types of batteries that pre-dated lithium ion batteries, but technology has moved on.
Apple has a very informative resource at www.apple.com slash batteries. (This tool wouldn't let me enter the URL.)
- Answered by Donald D from Santa Clara
- Feb 27, 2014
- Flag as inappropriate Answer 4
I don't have a definitive answer, but it's been my understanding that the whole "completely discharge, then completely recharge" cycling approach was really important in the days before Lithium Ion batteries were common, and Nickel-Cadmium were the main rechargeable batteries.
The old "Ni-Cad" batteries had what was called the "memory effect", which meant that if you didn't always discharge it, it would "remember" that (in effect), and shorten the useful amount of charge time plus shorten the lives of the batteries.
HOWEVER...Li-On batteries were invented specifically to address this problem among other things. I have Li-On batteries in my phone and my iPad which I've been using without doing this careful "full discharge" cycling for years and haven't noticed any decrease in usable charge.
Some people may still think this is necessary, and if they do it, their devices should work fine. But they would probably work just as well if they didn't, hence the confusion.
My main point is, you need to do more research. My feeling--NOT supported by rigorous testing or research--is that full discharge cycling is no longer necessary with modern Li-On batteries, so you should be able to keep your MacBook plugged in all the time without worrying about any "memory effect".
- Answered by Jefferson W from Albuquerque
- Feb 28, 2014
- Flag as inappropriate Answer 5
Just plug that sucker in and enjoy it. Use the battery for those days when you go outside.
As soon as you use the battery the screen goes a bit darker, to save energy. I like it bright, since I edit video and photos.
Hope this help.
- Answered by Juan U from Glendale
- Jan 26, 2014
- Flag as inappropriate Answer 6
MacBook Pro vs iMac..which is better to run adobe creativel suite 6 programs?
- Asked by Leila V from Flushing
- Oct 24, 2013
- Flag as inappropriate (MacBook Pro vs iMac..which is better to run adobe creativel suite 6 programs?)
Which macbook is best for running Matlab, Photoshop, Word processing, Excel, and Powerpoint? 13" macbook air or 13" retina macbook pro?
- Asked by Tongjai C from Cambridge
- Jun 30, 2013
- Flag as inappropriate (Which macbook is best for running Matlab, Photoshop, Word processing, Excel, and Powerpoint? 13" macbook air or 13" retina macbook pro?)
How long does it take to charge the battery on a new MacBook pro?
- Asked by Linda L from San Jose
- Sep 30, 2012
- Flag as inappropriate (How long does it take to charge the battery on a new MacBook pro?)