These batteries are specifically designed and built for the toshiba satellite a10/a15 series G10/15/20/25 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 satellite a10/a15 series G10/15/20/25 series Batteries; even it delivers 5% more power than the original toshiba satellite a10/a15 series G10/15/20/25 series Battery.