Bastex Lg Thrill 4G Optimus 3D Replacement Lithium-Ion Extended Battery with Black Cover (3500mAh) This Replacement Lithium-Ion Extended Battery with Black Cover (3500mAh) is a great backup battery for you. Keep one for your cell phone handy at home, in the office or on your travel. High Capacity rechargeable battery rated at 3500mAh for your cell phone Expect to Approx. Double Your Talk and Standby Times Extended battery for you to keep as a reliable extra power source handy Advanced technology keeps phone working at optimum performance. Includes a battery cover that is specifically designed for the battery and your phone