BL-44JS for Sprint LG Viper 4G LTE LS840 ~ Extended Capacity 3600mAh Li-Ion Battery + Back Cover ~ Mobile Phone Repair Parts Replacement BL-44JS for Sprint LG Viper 4G LTE LS840 Extended Capacity 3600mAh Li-Ion Battery + Back Cover Mobile Phone Repair Parts Replacement The same as picture shown. The extended battery is thicker than a normal one, so buyers should use the back cover, which is included for this item.