I have a 16 pro max, the battery health is 100% and it has 144 cycle count, the battery is mostly good but the problem is that when the battery drops to about 20-30% and then I leave the phone off for about 3-5 minutes, the battery drops 2-3% (this only happens when the phone is below 30%)
iPhone 16 Pro Max
For clarity by "off" did you mean powered down or just screen off?
Powering phone down then up again will use quite a lot of battery, maybe 2%
Leaving it powered down for several hours may show a bigger loss.
Check your iPhone battery for Self-Discha… - Apple Community
I’ve never bothered to check that “feature”; I just use the phone and charge it when it goes below 20% (which is almost never). But I suspect the battery gauge is less reliable when the battery is nearly depleted. I see little point in attempting to micromanage the battery I just use and enjoy the phone and pretty much ignore the battery gauge until it warns me that it is below 20%.
just the screen off
iphone 16 pro max drain battery when powered off
