Power Bank caused poor battery life, Wipe Battery Stats.
I thought I share my negative experience about using a power bank / portable phone recharger. I had bought a very cheap 5000mAh power bank from China on eBay. Sorry I no longer have eBay link but what I bought which was advertised as HTC One X compatible and it included a 1A power out USB port.
I charged the power bank and then charged my phone from 50 odd % to 100%. Then again from 37% and it only got as far as mid 50s% and the power bank ran out of juice. Afterwards charging my phone normally would take roughly 2 - 3 hours to charge and although it was showing 100% I would get no more than 5 - 6 hours of battery life. I put up with this for some time and eventually bought and installed a replacement battery which was authentic. I charged my phone and the same thing happened. No more than 6 hours of life. So I thought something had been ruined in my phone.
Anyway I have ViperX on my phone and last night noticed there had been a new version 3.6.1. I was in the ClockworkMod advanced settings to wipe the Dalvik Cache that I saw an option to Wipe the Battery Stats and the battery works perfectly.
Out of curiosity does anyone have any knowledge of what may have occurred with my battery/phone by using the power bank.