This Vaio PCG-5K1L battery is compatible with the BPS9 series of Sony battery part numbers as well the BPL9 high capacity versions.

This Sony PCG-5K1L battery DOES NOT require a Sony BIOS update from a CD or web page in order for the battery to be recognized by your Sony laptop. This is the Black version. Here you can find the silver BPS9 battery here. This battery is compatible with all versions of Windows including Windows XP, Windows Vista & Windows 7.

Inside Each Sony PCG-5K1L 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 Sony PCG-5K1L battery is 100% compatible with your Sony PCG-5K1L model. Each battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.