iOS 15 nuked by battery health

[Kingskull]

My 12 pro max which is 8 months old only, got from 100% to 96% from beta 5 and now two weeks later it’s on 94%

fun fact is that my previous phone was iPhone 11 and I had ios 14 beta on it and the battery went from 100 to 79 in a month!!! And the battery was so rekt it worked on 1% for 6-8 hours and thats why I had to change my phone

I don’t want to go through that **** again 😩

 

[Cinimod1000]

It’s obvious there is some kind of issue. iPhone 12PM here. Purchased late October 2020 and was at 98% pre iOS 15 betas. Now at 88% and have been on all the 15 betas.
yes I’ll be replacing this phone with a 13PM, but have never seen this loss in battery performance in past betas. Is Apple now using crappy batteries - or is the iPhone 12 series battery calibration just bad?? Like the 11 series software was updated at one point to enable a recalibration of the battery……
Just to add I have only used the same Mophie 7.5 watt wireless charger that I have had for a few years now. Never a 15 watt magsafe….. or wired.

 

[Cookie285]

iPhone 12 PM ordered and received on release last year, 98% before iOS15. now I'm on 91% and i think it will drop a few more % in the next days seeing how the behaviour was over the past week Overall Battery life seems worse in iOS 15 and i barely get through the day where i had no issues on iOS14. Maybe it takes a few more weeks to calibrate itself, if not i hope it drops further enough for an AppleCare replacement.

 

[sabrelli]

Bought 12Pro Max March 5 2021,
Prior to IOS15 being installed two weeks ago, health was 98%, its now dropped to 95%

 

[Bea220]

I have NOT updated my software and I'm at 95% health at the moment. I've despised my battery life on this phone so much that I'm terrified to update to iOS15 PERIOD.

 

[Ansath]

I have NOT updated my software and I'm at 95% health at the moment. I've despised my battery life on this phone so much that I'm terrified to update to iOS15 PERIOD.

It's not actually that bad, also people obsesses far too much about the health, but it's natural for it to drop, and it does it differently for different people, due to what they do/how they do it.

I've got an iPhone 12 Pro Max, gets me a day and a half, minimum & I'm more of a power user. My mum rocking an iPhone SE (not the new one), she can go almost 2 days too, before charging. My other half, running an iPhone X, can get all day. Our battery health is different, but we still get decent usage.

 

[kb2755]

Down again after 15.0.2. At this rate, I'm nervous about stretching this battery to 2023/iPhone 15.

 

[Ansath]

Down again after 15.0.2. At this rate, I'm nervous about stretching this battery to 2023/iPhone 15.

Your post is just perfect after mine, showing my point.

 

[cynics]

The drop on an lithium ion battery from 100% to about 80-85% will be fairly rapid. Once it gets there it will hold for a quite a while.

The iPhone 13 has a lithium battery with a nominal charge of 3.83 volts, its charged to ~4.45 volts. Dwelling at this overcharged state isn't good for the battery. Apple optimize charge is there specifically to minimize that dwell time. This is why that initial drop in health seems so rapid.

Conversely though, if the battery was only charged to 4-4.1 vdc to maintain its health it wouldn't last as long which puts us back in the same spot as if it was at a low capacity since the day it was bought.

Battery health doesn't exactly translate to longevity either. A battery with 80% health can last longer than 80% of what it could when it was new. There is a lot of factors that play into this.

Point is, don't worry about it. The time you invest into worrying about this could be invested into a few hours of overtime at work which would pay for a new battery plus a lot more.