How to fix iPhone 7 battery that is draining fast?
My iPhone 7 battery drains fast. It doesn’t last 40 minutes.
what do I do to rejuvenate it?
thanks
[Re-Titled by Moderator]
iPhone 6, iOS 12
The battery might very well need replacing. Let some service do it or DIY.
Before doing that, you might try to recalibrate the battery, and see if that helps any (probably not if the battery is old):
Charge it to 100%, and keep charging it for at least two more hours.
Use your device until it shuts off due to low battery.
Charge it uninterrupted to 100%.