Poweradd&trade; Extended Li-ion Battery 2200mAh Compatible for Samsung Galaxy S3 SIII i9300 Made with grade A Li-ion cells with 500 recharge cycles(3.8v/2200mAh) Rechargeable li-ion battery with no memory effect and environment friendly Built-in integrated circuit chip prevent overcharging and extending battery life Voltage:3.8V/capacity:2200mah Package included:1Poweradd cell phone battery,1User manual