vigilante
Galvanizer
Thanks @ALPHA17 and @damn, that's a real comprehensive list and I think covers everything. Will try the listed things then maybe go for rooting as well. Didn't knew about the battery calibrator.Change the phone Network type to GSM only from WCDMA (preferred) / GSM.
After rooting the phone use Battery Calibrator to fine tune your battery power-cycles further.
Another general question, how good/bad is it to use the phone for gaming while the battery is charging? or does it matter? I have read that it's not good to make calls while charging.
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