Battery percentage
Sir. My battery percentage suddenly falls down with in few days from 100 to 97. What’s the error
iPhone 13
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There is NOTHING wrong with your phone. Batteries are consumable parts. With EVERY full cycle battery charge, the battery will hold a little less charge than it did when new. This is what batteries do. ALL BATTERIES. Your battery health will continue to reduce with every battery charge and when it reaches 80%, which is will do without question, it will then be time to pay to have the battery replaced in your iPhone. Until then, don't obsess over something which is normal, and will continue to occur.
Read this article about maximizing battery performance, but do know you cannot stop batteries from declining --> Batteries - Maximizing Performance - Apple