Spyder i4 Power Shadow 2000mAh Battery Case and Charger / Sync Dock for Apple iPhone 4 and iPhone 4S (Retail Packaging) - Black 2,000 mAh Li-ion Battery "A"-grade Battery Cell On/off Button Battery Level Indicator Adds Minimal Size & Weight Includes convenient Charge/Sync Dock. Certified Made for iPhone. Fits both AT&T and Verizon iPhones. Adds minimal size and weight. 2000 mAh capacity provides up to -