These batteries are specifically designed and built for the sony vaio pcg-grs series PCG-GRS515M 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 sony vaio pcg-grs series PCG-GRS515M Batteries; even it delivers 5% more power than the original sony vaio pcg-grs series PCG-GRS515M Battery.