MacBook Air m1 battery reduced to 98%

I purchased my MacBook Air M1 2 months ago, I have completed 57 charge cycles and my battery health is reduced to 98% even though I have been charging it in the perfect battery cycle between 30%-80%

, never over 80 nor below 30, Why is this happening even after such care of battery.


will letting MacBook always on power with 100% affect battery health even 1% ? I doubt !

MacBook Air 13″, macOS 11.4

Posted on Jun 7, 2021 3:32 AM

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Posted on Jun 7, 2021 7:10 AM

Batteries are considered Consumable Products. Over time it will degrade to a point where it needs to be replaced. In you case - the usage is normal as the capacity will go up and down all the time and never stay always at 100%. Apple Batteries are rated for 1000 Full Battery Cycles and / or 80% Capacity before needing Evaluation or replacement.


For additional reading on Battery and Apple Computers this link may help. About battery health management in Mac notebooks and especially for the M1 and Big Sur If battery charging is paused or on hold on your Mac

169 replies

Sep 21, 2021 2:51 PM in response to Moosatheduck

Got mine in early April. Only at 19 cycles, but down to 94%. That's pretty crazy. I use it for work and need to have it powered up so it can run my monitor. I'd go nuts if I had to work on a 13 inch screen all the time. I know I should take it off power more often and just work for a day or 2 until it runs down all the way, so maybe I'll suck it up an do that every couple of weeks. But losing 6% in just a few months is crazy, especially when they tout it for it's amazing battery life...

Oct 25, 2021 6:28 PM in response to pparadisom

it's hard for them to test whether popular applications like VSCode or Chrome works well with the new cpu architecture which may cause lots of cpu consumption and kill the battery pretty quickly.


It used less than 2G of memory for Chrome when i removed all enabled but unused plugins like Google Docs ... or Video related plugins!


If you buy a $2k machine just to read news & email, it should not be a problem :))


FYI: with similar # of Chrome tabs for my 2015 intel cpu, the memory is not as high so i think they'll need time to optimise apps for the new architecture to work efficiently when you open multiple of them.



Oct 30, 2021 11:05 AM in response to ia1009

Again, I’m not sure that’s as bad as it may superficially sound. At this rate it will take you 5 years to reach 80% (which seems to be the psychological threshold where your battery life no longer being what it once was becomes very noticeable), which is pretty much the average lifespan of a laptop before you tend to start itching to get a new one for various other reasons as well. But again, that's only based on a 1% drop so far. Others on here definitely seem to have batteries that are deteriorating faster than they should be on a per-cycle basis, so it's worth keeping an eye on it in case it accelerates.


To try to answer your question though, I’ve heard that Chrome isn’t energy-efficient but can’t confirm firsthand because I don’t use it much. One general tip is that screen brightness can significantly affect the battery life. I normally keep mine around 50%, whereas in the 75–100% range you can definitely tell the difference on the battery drain. Also, if putting it to sleep on battery, don’t leave anything connected to either USB-C port (not even an idle cable or adapter), as that will cause the battery to drain more than it should during sleep; which seems to be an actual bug (https://discussions.apple.com/thread/252191369) that Apple will hopefully sort out sooner than later.


Otherwise, how do you find the battery life in general? As I commented in the above-linked thread, I’ve found it’s amazing for certain things (e.g. watching Netflix in Safari with little else going on in the background—it will actually approach the advertised 18 hours of video) but then surprisingly average to mediocre for other things that you wouldn’t normally think of as particularly energy-intensive. Mixed bag.

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MacBook Air m1 battery reduced to 98%

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