Samsung Infuse 4G Extended Battery 3500mAh SGH-i997 AT&T Increase Battery life Powerful grade A 3500 mAh true high capacity battery makes all the difference for the Samsung i997 Infuse 4G user. Include back cover. Lightweight Lithium Ion battery is about 2/3 the weight of a comparable capacity NiMh battery! This grade A cell battery features powerful Lithium Ion, so there is no memory effect either! Notes: A new Lithium Ion battery's full performance is only achieved after the initial 2-3 complete charge and discharge cycles. Battery may not fit into desktop charging stands & some holsters & cases. Back Extended Battery door is included!