Extend the battery life of your Apple iPhone 3G and 3G S with the Energizer AP1500, a rechargeable lithium polymer battery in the form of a slim light weight protective case with non slip grips. Piano Gloss Finish. Also includes LED battery indicator light. Product is Apple certified (works with iPhone) Extra battery life as follows: stand by time 255 hours; talk time up to 4 hours; internet use up to 4 hours; music time up to 20 hours; video time up to 6 hours.