This is a brand new Sony BPS9 VGN-SZ691N battery.

This battery ships fully tested and ready to go. Unlike other batteries on the market, this battery DOES NOT require a BIOS update from a CD or web page in order for the battery to be recognized by your Sony laptop and can be used immediately. This battery is Black in color, if you require the Silver battery please click here. This battery is compatible with all versions of Windows including Windows XP, Windows Vista & Windows 7.

Inside the VGN-SZ691N 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 SZ691NX battery is typically superior to the original battery and is 100% compatible with your Sony Vaio VGN-SZ691N laptop. The battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.