These Laptops Batteries are specifically designed and built for the TOSHIBA TOSHIBA Satellite 5100 Series With a longer power lasting time and quick time to be fully charged, the battery gives you the best performance possible compared to original manufacturer standards for TOSHIBA TOSHIBA Satellite 5100 Series Batteries; even it delivers 5% more power than the original TOSHIBA TOSHIBA Satellite 5100 Series Battery.