Yeah, I'm not a scholar of batteries either but over time if you don't run the battery down to 0% periodically you may find that the fuel gauge gets out of sync. So you can have a situation for example when your battery charge says 0% but the phone is still working, or you can have 30% charge and a powered off device. So that's what your calibrating is the charge readout probably not the battery itself. I think you could get into situations too where if the gauge on the battery is out of sync with the cells, it might attempt to charge an already filled battery unnecessarily, but I think there is a few other checks to prevent that from happening. I'm not sure what programmatically goes on in battery management firmware. It is probably slightly different for every firmware. I don't calibrate batteries regularly but I had to do that once because the phone and computer were showing weird battery numbers. I had them both showing 100% charge after a full 8 hours of heavy use. So maybe this clears up some things or if I'm misunderstanding something then we can find some decent answers and not get confused. I think battery firmware changes with every update too. Maybe this is related to the random reboots and failed sign-ins to icloud stuff after ios 9.1 updates, neither of which were fixed from a full restore from itunes but I don't know. But phone is very unhappy at the moment.
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