Battery for Sony Vaio VGP-BPS21 VGP-BPS13A VGP-BPS13B VGP-BPS13A/B VGP-BPS13B/Q | eBay
Sony Genuine Brand VGP-BPS21 VGP-BPS21A 6 cell battery for VGN-F NW NS CW AW BZ and SR series Laptop Battery also Replaces VPC-CW VPC-F VPC-S VPC-Y Series computer batteries
Amazon.com: GHU VGP BPS21A, VGP BPS21B, VGP BPS13, VGP BPS13 Q, VGP BPS13B 58 Wh Battery - UL Tested, 3+ Hours Duration, Fast Charging, Reusable 500+ Cycles, BPS13 Battery for Sony, Free Returns : Electronics