How do I increase my battery capacity
How do I increase my battery capacity
iPhone X, iOS 15
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You can't.
Batteries degrade over time with usage, that's just how they work. You can expect about a 1% drop per month with average use on an iPhone.
Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.
Here are some tips on maximizing battery life.
Batteries - Maximizing Performance - Apple