Hi all, I've a Macbook Pro 14" M2 pro max and on friday afternoon I turned it off with 100% battery. This morning I turned it on and the battery was 93%!! How is it possible?? What do you think it could be due to? I'm not familiar with Macbooks with Apple processors but it doesn't seem normal to me…
Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Mac off and battery drain
- Thread starter axelv73
- Start date
- Sort by reaction score
That because Apple does this for battery preservation this happen down to 80%! this is normal!
My mac was off, not in sleep mode
So you say as soon as I turned it on it started the battery optimization? Objectively, it is now 80% connected to the power supply…
I don't think that's how that works. If the machine is completely shut down, I don't think battery optimization kicks in. When I shut down either of my M1 Pro machines, they are at the same percentage when I boot them back up, and they both have optimized charging turned on.
OP, I do wonder about your Power Nap settings and/or if something is preventing your computer from shutting down when it's supposed to.
You have to blame the millennials because they kick and screamed for years for this kind f behavior! I guess you are special!
I was talking to you! I was stating fact because I remember years and years of people screaming for this behavior in computer batteries for awhile to help preserve the lithium battery in Macs for the long term for those using laptops as desktop and always stay plug-in
Is it possible to recover this morning's optimization process? To see what time it started and how much was the battery? Because objectively the optimization started as soon as the mac started, in fact it is stopped at 80%, having brought the system from xx% to 80%.
You need to chill and read the OP again.
This could be normal, that's less than 2 % a day. The perceived percentage loss could probably be traced back to several different "issues", for example the percentage reporting not being exactly accurate (we're basically measuring the voltage in real time and guessing the amount of charge left from how it behaves) and the battery actually losing a bit of charge over time (which is normal and faster when it's fully charged). I wouldn't lose my sleep over it.
I wouldn't even drag battery optimization into this. That's an algorithm that limits charging, and it certainly does not discharge the computer on its own. Battery optimization stop the charging process when it thinks you won't be needing it fully charged anytime soon, and it can slowly let the charge come down from > 80 % back to 80 % (which is the target value), but that's only when the machine is already running and consuming power.
Ok ok but I was wondering because just when I turned on the mac the battery discharge for optimization started. Thanks anyway for the detailed answer.
I'm not sure I understand. I like the battery optimization feature. I've been using it as long as it's been available on multiple MacBooks and it's always been reliable for me. For example, my work computer stays at a steady 80% because it rarely gets unplugged or shut down, but my personal one always tops up to 100% when I plug it in because it's rarely plugged in and almost never shut down. Seems like everything is working the way it was designed to work.
I'm just saying it's not supposed to be managing anything at all if the laptop is completely shut down. Shut down means shut down for the most part. If OP is in sleep though, who knows what's happening in the background during Power Nap or whatever else.