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A question to people who have done battery swaps - do you need to erase-restore an iPhone beforehand for the process, or you just give it to the repairers as is? If the latter, do they ask you for a passcode?
I did it twice in my life and I didn’t erase the device before doing. Don’t give your passcode to ANYONE, Apple included.
I don’t know about third parties repairers.
For sure it is recommended to have a backup before doing that, but a backup is recommended anyway
 
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My 15 PM dropped to 85% after 320 cycles. Maybe I need to upgrade...
 
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