I have the 1850 mugen extended battery and it is awesome. It lasts a full day of moderate to heavy use of texting and internet use and part of the next morning when I don't get a chance to charge it. I'm fixing to get a rocketfish case for my dinc from best buy. It's a lil pricey but its the thinnest case I have found. Let ya know how I like it after a lil bit of use.