This is a brand new Asus X556UQ battery. You can expect about 4 to 5 hours of run time with this Asus C21N1509 battery when new, depending on your energy use.

We use the highest quality lithium-ion battery cells and components that charge faster and last longer than cheaper, lower quality batteries. Low quality batteries can wear out in just a few months. Our batteries can last up to 5 years.

Each battery is tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.