Internal Battery for Lenovo ThinkPad T570 T580 P51s P52s Business Series Restore your Lenovo ThinkPad T570, T580, P51s, or P52s to optimal performance with this genuine 32Wh internal battery. Specifically designed as the internal battery component for these business laptops, this 01AV493 compatible battery works in conjunction with the external battery to provide extended runtime and battery redundancy. Features precise 15.28V output and compact design.