I think HTC are trying to emulate Apple's laptop technology. On my macbook pro, it will charge up to 100 but say you do something processor hungry for a couple of minutes where it can't charge fast enough so it drops to say 98%, it will keep it at this level until it drops under 95%. The reasoning is because the new batteries work better this way instead of trickle charging, which in the long term damages the battery life. Also, so far I have used 10 'cycles' of the battery; one cycle counts as every full 100 discharge, so a drop from 90 to 60 counts as only 30%. HTC are gonna need to work at it to achieve something similar.