Kensington K39253US PowerLift Backup Battery and Dock for iPhone 4, 3GS and 3G-Charger - Retail Packaging - Black

Kensington K39253US PowerLift Backup Battery and Dock for iPhone 4, 3GS and 3G-Charger - Retail Packaging - Black by Kensington (63)Buy new: $49.99 $36.56 33 used & new from $27.00(Visit the Most Gifted in Batteries list for authoritative information on this product's current rank.)Review & DescriptionThe Kensington PowerLift Back-Up Battery, Dock and Stand gives your iPhone hours of extra power