Green Power Solar Battery Case for iPhone 4, 1800mAh Li-Polymer Battery, Mini USB, UV Coated Case - 1 Pack - Case - Retail Packaging - Black High Capacity Rechargeable Battery - 1,800mAh Li-Polymer Battery Convenient Solar Charger Crystal Protection Case - UV-coated Polycarbonate Crystal Easy Sync & Charging Battery Level Display - 4 LED Indication Levels