new battery. battery. For optimal performance, calibrate your newly installed battery: Drain battery below 10%, then charge uninterrupted to 100% [ … ] This guide instructs you to detach the front panel assembly; this is intended to prevent damage to the display cables. If you feel comfortable supporting the display carefully while peeling the battery out of the iPhone, you can skip the display removal and go directly to the battery removal steps.

reverse order. order. For optimal performance, calibrate your newly installed battery: Drain battery below 10%, then charge uninterrupted to 100%