i found charging in windows to be strange.. i switch to android and charge mine of a 5v 2amp charger and it charges pretty good with ampere open 4 hours to be fully charged. kind of sucks for working in windows while still be plugged in.
Yeah even with 2 years of time it would be unplugged and plug again forever! so far it seems battery isnt too bad after the first power cycle down it doesnt seem to get a constant charge tho it likes to hop between 800-1250 maH quite a bit.