Shinntto(TM) High Quality Replacement Laptop battery for SONY VAIO VGN-NR21J/S; VGP-BPS9B, VGP-BPS9/B, VGP-BPS9/S, VGP-BPS9A/S, VGP-BPL9, VGP-BPL9C, VGP-BPS10;10.8v; 4400mAh; BLACK (Digital certification, insert and use! NO CD/download SOFTWARE REQUIRED and NO NEED TO UPGRADE BIOS UPGRADE)