Customer First24 x 7 email support. We specialize in providing quality power products and quality customer service.(Note: return windows will close after one month, If you have any problem with battery, please Contact us - in "YOUR ORDER" options click the "contact seller".) Tech Specs & 100% New ProductsModel: BTY-M6M Voltage: 15.2V Capacity: 99.99Wh / 6578mAh Battery type: Li-ion Cell: 4-Cell. (We only use grade A battery cells that provide up to 500 recharge cycles over the life of the battery. Come with screwdrivers.)