[Aftermarket Product] 3500 mAh Ext Extended Battery Backup Spare Replace Replacement+Cover Door Plate Panel Faceplate Fascia For Samsung Sph-D700 Galaxy S Epic 4G High Capacity reliable Lithium-Ion Battery rated at 3500mAh Expect to Approx. Double Your Talk and Standby Times This battery for you to keep as a reliable extra power source handy Advanced lithium-ion technology keeps phone working at optimum performance.