I bought 3500 batt from ebay for 7.00. I shut off the 3G data update and running JD. I easily get 50hrs of use and really enjoying the phone now! My friend at work has an EVO and he chews through the power and is always charging it at work. The new back has really grown on me and I can grip it nicely. Samsung should have put one of these in from the start. My epic blows the EVO screen away in color and contrast and brightness. I am now pretty darn happy. It is cased in a standard leather fold-over case from ebay with leather inner and out lining. It was a little tight with new power but is really working well for me.