Calibration doesn't do nothing and certainly not gonna give you better battery life.
Sent from my HTC One X using Tapatalk 2
Yes it bloody does lol I have done it a couple times for people and its the first thing HTC will recommend doing. After using your phone for long time charge and drain, installing new Roms the battery can loose its 100% charge that is why doing the Calibration fixes it.
Hell I have even seen it listed in manuals. There is also the Rooted way Charge phone till 100% green light unplug and restart into Recovery and delete battery stats, switch off phone and charge till again green light. Never tried this one has stock HTC way I have noticed works well.
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