I have an Evo and was very frustrated feeling like I had to be tethered to an electrical outlet whenever possible to prevent my Evo from dying when I needed it most. I could not get through a day of work (8 hours) without charging. I bought one of those extended batteries with a larger cover on eBay for less than $1 plus about $9 in S&H. I've gone 24 hours now without charging and still have half of the battery left. The retail price for one of these batteries is over $50. I'm extremely pleased with the battery I received and it's performance. on eBay, search for "Evo extended battery" Some sellers are overseas (Asia) and may take 3-4 weeks to ship to US addresses. My only complaint is solved! I Love my Evo!