Hi guys, I was asked this question by a family member who owns a 4s. I now own a HTC one and I didn't actually know the answer. Is there a need to calibrate batteries? Is it bad for the phone to be left plugged in overnight? I'm sure if these are myths or whether the newer batteries require calibration. I've never had an issue iwth leaving it plugged in over night before. Whats the appropriate course of action to make sure the battery lasts along as it should? I actually turn my phone off alot, is that a bad idea? Or should I be slipping it into airplane mode instead? Cheers guys, the question applies to both phones thanks Edit: I also charge the phone whenever I can, regardless of battery life, ie in the car, at work.. is this a bad idea?