These batteries are specifically designed and built for the toshiba satellite 5105 series 5105-S501 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 satellite 5105 series 5105-S501 Batteries; even it delivers 5% more power than the original toshiba satellite 5105 series 5105-S501 Battery.