Sony 6-cell VGP-BPS30 Battery for SONY VAIO T11 T13 Series Compatible with VGP-BPS30 Sony VGP-BPS30 Laptop Battery High Quality Laptop Battery 11.1V 4050mAh 6-cell Designed for SONY VAIO T Series,SONY VAIO T11 Series,SONY VAIO T13 Series,SONY VAIO SVT-11 Series,SONY VAIO SVT-13 Series, 1 Year Warranty