CellPhone Charger for Samsung Galaxy S II S2 S 2 4G (Boost Mobile),Samsung Galaxy SII S2 4G (Ting) - External Dock Battery Charger Wall Home Spare Extra Travel
You do not need a special back cover to use this batteryThis package is specifically designed for the cellphones we list here, if your cellphone is not in the list , then it's not for you.======================================================================100% Brand New.AC/USB Desktop Battery Charger :* Quick charge with automatic constant current control prevents battery from over charging, short circuit, and electronic shock.* Charge your cell phone battery without the phone.* Also work with OEM (original) battery.* LED charging light indicator. Turn red in charging, turn blue when done.* Input: AC 100-240V 50/60Hz 150mAh.* Output: DC 4.2V 350mAh  50mA.* USB Port Output: 5.2V 800mAh.* Use this charger to charge the stock battery as well, swap one out when the other dies.