With a built-in battery, this OtterBox Defender Series 77-25819 case delivers additional power to your Apple iPhone 4 or 4S on the go. An iON Intelligence app shows the power status for the case and your phone for simple information at a glance.

OtterBox - Defender Series Battery Case for Apple® iPhone® 4 and 4S - Graphite

$129.99

With a built-in battery, this OtterBox Defender Series 77-25819 case delivers additional power to your Apple iPhone 4 or 4S on the go. An iON Intelligence app shows the power status for the case and your phone for simple information at a glance.