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How to drain an iPhone battery completely in order to calibrate it in a right way?
iPhone 7, iOS 14
Well, how to do that properly? Because I'm having an issue with incorrect battery percentage, when I restart the phone it shows the real percentage for about one sec, then it shows some other percentage...
You don't need to do that.
The battery does not need any calibrating.
Never let drop below 30%.
Really? I didn't know that!
There is no need to calibrate it.
Your battery sounds like it is failing. Did you check Settings > Battery > Health and see what the percentage is?
How to drain an iPhone battery
