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Battery percentage problem in my Macbook Air M1

H

Hegyirabló

macrumors newbie
Original poster
May 23, 2021
5
1
Hi Everybody!

I bought a Macbook Air M1 since three weeks ago. And I have a problem with battery percentage. If I turn it on with plugged in charger, the battery percentage is only 99%. After one or two hours, always 99%. BUT, if I unplug the charger, immediately switches to 100%. Again I plug the charger, switches 99%. Unplug, 100%. Plug, 99%, etc, to infinity. Optimized battery charging always off with me.

What is this? How can I fix it?

Thank you very much!
 
It seems to me it tries some sort of trickle charge. Unplug it and do three or four cycles down to 5/7% then recharge and when full, disconnect and just use battery. I don't like keeping the mac plugged to the grid all time.
 
Similar thing here I really wasn't thinking too much about it although it is kinda weird. Never happened to me before on any windows laptop.
 
Nope I have so many things to worry about these days I didn't bother to put this on the list although it's not a good look from apple. I think it's another example of the buggy mac os. @Hegyirabló
 
Last edited:
Hegyirabló said:
Hi Everybody!

I bought a Macbook Air M1 since three weeks ago. And I have a problem with battery percentage. If I turn it on with plugged in charger, the battery percentage is only 99%. After one or two hours, always 99%. BUT, if I unplug the charger, immediately switches to 100%. Again I plug the charger, switches 99%. Unplug, 100%. Plug, 99%, etc, to infinity. Optimized battery charging always off with me.

What is this? How can I fix it?

Thank you very much!
Click to expand...
Did you try to do what I suggested? Use it normally until it reaches 5 or 6%, then recharge to full, then disconnect and use. Those full cycles should work. Please let me/us know how it goes.
 
There is a algorithm hard coded into Big Sur to insure it learns the charging and battery usage. It is designed to pause the charing at about 80 % and hold there even if plugged into charger for hours. That is, unless the fuser over-ride this and forces the charging to above. Though, it will usually pause again at 90%. So the 99% while plugged in and disconnect and reconnect might be confusing the algorithm functionality resulting it this behaviours
 
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