Amstron provides reliable, high performance replacement batteries for your Toshiba laptops. The LTO-41 is designed to be 100% manufacturer compatible with Toshiba OEM part numbers PA3178U-1BAS and PA3211U-1BAS. Amstron Lithium-Ion batteries provide superior performance and reliability. The PA3178U-1BRS replacement Toshiba battery is rigorously tested for productivity and compatibility with the Toshiba Portege A100, Satellite 5000, Satellite 5100 and other series of Toshiba notebook models. The LTO-41 is designed to meet or exceed the original battery of your Toshiba laptop. • Chemistry: Li-Ion • Rating: 10.8V 4000mAH • Will meet or exceed original specifications • Warranty: 1 Year