I've notice a big difference now. I bought a cradle charger and put the extended battery in the extra battery slot. I let it charge in there for about 30 hours. It's been an hour so far and it's still at 100 percent. I think if you charge this battery out of the phone you'll see a huge difference. I am definitely going to order another battery soon as we as another cradle charger. I got the cradle charger from Amazon for about 12 dollars plus shipping. Awesome deals.

Originally Posted by Jive Turkee

I tell people to buy an external charger or cradle. I get great battery life as I rotate batteries. I very rarely charge the battery while in the phone.

x2 and do recommend

There is a seller on eBay (moretalktime) who sells custom TPU cases for a lot of phones including the evo 4g with the extended battery.

Amazon deals sound amazing, but are they good quality and wont fly to rubbish bin in like couple of months? I am looking for a good extended battery myself for my Evo! I ve been reading and searching and came across this Mugen brand which has stellar reviews!!! But the price 8-l !!!! definitely not amazon! any advice??