NEEWER&reg; Rechargeable Li-ion Battery 1200mAh For Apple iPhone 3GS 16GB 32GB Compatible with: Apple iPhone 3GS 16GB 32GB.(Does NOT fit 2G or 3G iPhone) Replace low performance battery Keeps the music playing on your Apple iPhone with this replacement battery.? This is a high capacity / rechargeable Li-Ion (Lithium Ion) Polymer battery.? type:Li-ion battery,4.51Whr