BYD Power Battery Stick for IPhone 4S 4G 3GS 3G HTC Blackberry Samsung Android Phones,Original BYD Power Bank,2200mAh Power Stick For Mobile Phone,PDA,MP3 Player. Best Replacement Rechargeable Battery Stick manufactured by BYD,Capacity: 2200mAh, 3.7V / 8.1Wh Input: DC5V / 900mA (max),Use USB cable to charge Mobile Power,Charge and discharge at the same time The product widely uses in the handset, intercom, digital camera, MP4, PDA and so on,Output: DC 5V / 900mA (max) Input port: Mini Usb,Products: BYD Mini Battery Energy Sticks Small, Convenient and Easy to use,External power for your digital products.Dimension: 21.3mm (D) x 129mm (L)