http://www.amazon.com/gp/product/B00317ZW48?ie=UTF8&force-full-site=1 My original battery lasts me only 6-8 hours, I'm a heavy user. Bought two for under $10 from OEM Planet, free shipping. Arrived in 5 days. Work perfectly, and are identical in every way to the original. Honestly don't buy anything from the store, these aren't chinese fakes. I keep em in old school gameboy game cases. Save yourself a case of beer or night out with the gf, and avoid the $30-$50 waste of money on an extended. Is anyone getting over 10 with a rom on gingerbread? It seems to be eating a lot, in comparison to froyo. I remember 15+ on liberty 1.5 with a lower clock and voltage.