Battery health
My battery health become 99% after 4 months and after two days i downloaded the new ios version it become 98% after day and my iphone is iphone 12pro
iPhone 12 Pro, iOS 14
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This is normal. Lithium batteries degrade over time, this is why your battery might not last as long now as when you originally purchased your device. It should reach around 80% after two years.
You can find out more information about battery, charging and optimising your battery to get the most out of it here