1200mAH Replacement Battery for iPhone 3GS 8G 16g with 7 Pcs Tool Kit High quality, li-ion pack , 1200mAh Battery capacity High durability with extra power ,Without memory effects over 300 cycles Built-rechargeable battery protection circuits safty, Voltage 3.7 V Compatible with iPhone 3GS 8G or 16G, not for iPhone 3G Easy change with tools provided , Save upto 0 with this change kit