Get longer battery life with a new Sony Vaio VGP-BPS21 laptop battery. This battery ships fully tested and ready to go. Unlike other batteries on the market, this battery DOES NOT require a BIOS update for it to be recognized the Sony battery software. This battery is compatible with all versions of Windows including Windows XP, Windows Vista & Windows 7.

This VGP-BPS21-B battery replaces the Sony Vaio VGN-FW, NW, NS, CW, AW, BZ, SR, VPC-CW, VPC-F, VPC-S, VPC-Y series laptops and many more listed at the bottom of this page.

Inside the VGP-BPS21 battery are South Korea's best Lithium-ion rechargeable battery cells. The superior battery cells will provide longer run times between charges as well as a longer service life than cheaper batteries. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This means you can recharge your laptop any time without diminishing your battery capacity. This laptop battery replacement is typically superior to the original battery and is 100% compatible with your Sony Vaio VGP-BPS21 notebook computer. The battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.

You can expect about 2 - 3 hours of run time with this Sony Vaio VGP BPS21B battery when new, depending on your energy use. The higher capacity battery cells inside this cartridge have an energy capacity of 5200 mAh. This battery will be compatible with batteries rated at 4400 & 4800 mAh capacities while providing up to 20% more run time. If you are looking for even longer run times please see our Sony BPL21 battery.