Topeak RideCase PowerPack

Recharge your smartphone on the go with Topeak's RideCase PowerPack. The 5200 mAh Lithium-ion battery fits the iPhone, iPad, or any other smartphone with a Micro USB port and attaches to the stem for easily accessible, yet out-of-the-way power backup for your phone. In fact, it can charge your iPhone up to 3 times before you need to plug it back in!