I hear if your turn the phone off it will last 2 days on a battery charge!
Seriously, this phone has horrible battery life and unfortunately the only solution I found was to run Mighty's custom ROM's. I can usually get through a 10 hour work day with mild use of the phone with out it dieing on me. Flashing a custom ROM is not something I wanted to do but I am stuck with the phone and had to do something to make it work.
I have to laugh at all the suggestions on how to get more life out of the battery, turn this off, don't use that, disable this. Why did we pay all this money for a phone that you cannot utilize the features on?
Even with custom ROM, following all the suggestions here and minimal use of the phone there is NO WAY I can get more then a day out of my battery.
HTC/Sprint should be recalling all Diamonds in my opinion as they do not live up to anywhere close to the suggested battery life.
.