The Runtastic Battery Case extends the life of your iPhone battery by many hours. It is perfect for long fitness activities (10+ hours of hiking, biking, ...). The Runtastic Battery Case also serves as a protective case, an integrated On/Off key and an integrated USB cable, so there is no external cable needed to charge battery. Thanks to the sync function you can always stay up to date how much battery power you have left.- Capacity: 1700 mAh Li-Poly - Compatible for iPhone 4 and iPhone 4S - Integrated USB cable- Ideal for long fitness activitiesFind out the Runtastic Battery Case For Iphone 4 / 4S in stock and at the best price. Also have a look on our Heart rate monitors and gps sales and choose our best offers. Find the latest reductions and discover all our sales on Accessories products at amazing discount prices! All this to ensure you get the cheapest deal every time at Runtastic free delivery New York.