battery
my battery is draining fast what it could be a problem?
iPhone 6s, iOS 15
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Start by checking your battery's maximum capacity here:
Settings → Battery → Battery Health & Charging → See Maximum Capacity
If it is around 80% then you should change your battery. Apple also recommends replacing the battery at around 80%
You can find more information, as well as local prices for battery replacement here:
iPhone Battery Repair & Replacement - Apple Support