The Green Cell SY05 is a replacement laptop battery for selected Sony VAIO models. It is listed for the VGN-FW series, PCG-31311M and VGN-FW21E, and corresponds to the VGP-BPS13 and VGP-BPS21 battery references.
Its lithium-ion design has a stated capacity of 4400 mAh and voltage of 11.1 V / 10.8 V. The pack contains 6 cells, with overcharge and overdischarge protection listed in the product specification.
Finished in silver, this battery provides a compatible power source for the listed VAIO laptops. Its product code is SY05, which identifies this Green Cell variant.