I have had my Desire now for about a week, Battery is useless. I have attempted to charge only when flat to condition battery (All new batteries need to be conditioned regardless on chemistry - i know as im an electronics engineer that has to play with such devices day in day out). Battery life has improved the first charge lasted about 4 hours, but i was playing. after that it lasted less than a day, and so the problem persists, I have now reduced display brightness and retrieval times for gmail and facebook. I have also disabled the always on internet. Wifi kills the battery in about 2 hours flat. Pretty disappointed and tempted to return it.