I am no expert but in my experience with flashing roms i have never found an absolute need to recalibrate battery or specifically backup the related files.Is it a good idea to recalibrate when flashing roms probably so.is it necasary when just changing batterys probably not unless you really like to keep track of your battery usage.
i never use battery apps to calibrate any battery, i just charge them to 100% and let the die to the phone powers back down. Battery calibrate apps are just another app running using resources for no reason.
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