Backup Battery for Cell phone Capacity: 2000MA Backup Battery Charger for iPhone 3g&iPhone&iPods* Battery Type:Lithium-ion battery* Capacity:2000mAh* Rated Input: 5V,800mA* Rated Output:5V,500mA* Charge time: Around 4 hours* Dimension:67*62*15mm,the width & depth is same as iPhone 3G* Weight:65g Compatible with:* Work for all iPhone 3G,iPhone,all iPod models,Mobile phones,MP3 & MP4 Players