This is a brand new Asus A31-U20 battery for select Asus U20 laptop models.

This Asus A31-U20 battery for U20 models uses the highest quality Lithium-ion rechargeable battery cells and components. The superior battery cells will provide longer run times between charges as well as a longer service life than cheaper batteries.

This Asus A31-U20 battery is 100% compatible with your Asus U20 computer. Each battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.

You can expect about 2 hours to 2 - 3 hours of run time with this A31-U20 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.