What is the battery life percentage
I hv a iphone 8 plus i think my battery is too weak i cant use it whole day
iPhone 8 Plus, iOS 11.3
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That your battery will not last the whole day is not necessarily a fault with the battery. Much depends on how you use it (particularly where energy intensive games, level of brightness, background running apps etc.
https://support.apple.com/kb/HT201264?viewlocale=en_US&locale=en_US