Genuine Toshiba Qosmio X500 X505 12 Cell Battery PA3730U-1BRS A000051280PA3730U Specifications * Capacity: 10.8V x 8000 mAh * No. of Battery Cell: 12-cell * Dimension & Weight: 3.78 W X 8.18 L x 0.89 H; 1.43 lb * Compatible with Toshiba Satellite P500, P505 and P505D series portable computers; Qosmio X500 and X505 AVPCs * RoHS compliant * Battery Life: 3 hours 54 minutes ~ 5 hours* (Normal Mode) * Recharge Time (Main Off/On): 4.5 Hours / 10.5 ~ 21.5 Hours Battery life may vary considerably depending on product model, configuration, applications, power management settings and features utilized, as well as the natural performance variations produced by the design of individual components. Published battery life numbers are achieved on select models and configurations tested by Toshiba at the time of publication. Recharge time varies depending on usage. Battery may not charge while computer is consuming full power. After a period of time, the battery will lose its ability to perform at maximum capacity and will need to be replaced. This is normal for all batteries.