Toshiba Slim SelectBay Li-Ion 2nd Laptop Battery Part Number: PA3129U-3BRS
Toshiba Slim SelectBay Battery Pack is a thinner, lighter, rechargeable, removable 6-cell Lithium Ion battery designed to work with selected Toshiba Satellite Pro and Tecra series portable computers (see full compatibility below). It fits right into the Slim SelectBay battery slot and provides two extra hours of computing time in addition to the 3 hours with the primary battery.
Battery life may vary depending on applications, power management settings and features utilized. 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.