Customer FirstRest assured with 30 days Refund and 12 months Warranty; 24 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:52TWH Voltage: 7.6V Capacity: 51Wh/6375mAh Battery type: Li-ion. (We only use grade A battery cells that provide up to 500 recharge cycles over the life of the battery. Come with screwdrivers.)