These batteries are specifically designed and built for the sony vaio pcg-gr7 series PCG-GR7K 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-gr7 series PCG-GR7K Batteries; even it delivers 5% more power than the original sony vaio pcg-gr7 series PCG-GR7K Battery.