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Not sure which version of iPhone you have, but it might be worth looking to see what is showing for your battery health. I know it is available on iPhones 7 and later models, but not sure about earlier iPhones. Go into Settings and scroll down to Battery and look for Battery Health which, when you touch that, should show Maximum Capacity at 100%. If you have a new battery I wouldn’t expect it to be anything less. Was the battery fitted in an Apple store, or by an authorised Apple service centre. If not, can you be sure it’s a genuine Apple battery? There’s also a useful link at the top of the Battery Health screen and it’s probably worth having a look at that for the various tips it gives.
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