This is a brand new genuine Sony brand battery. The superior Sony cells inside the battery cartridge 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. The battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 1 year warranty.

You can expect about 3 - 5 hours of run time with this computer battery when new, depending on your energy use. Sony laptops are equipped with proprietary software which interfaces with the computer chip in your Sony battery pack. Other battery brands will require a software update to change your computer's BIOS to avoid violating Sony's software copyrights. This can be a potentially risky operation with a worst case scenario of completely disabling your laptop. In particular, laptops which use the Windows 7 operating system have a very low success rate with BIOS updates. Sony genuine brand batteries are "plug & play" ready as soon as you snap them in.

This battery replaces the Sony Vaio VGN-AW, VGN-BZ, VGN-CS, VGN-FW, VGN-NS, VGN-SR series laptop batteries and additional machines which are listed at the extreme bottom of this web page.