This is a brand new Asus U53 replacement battery. This battery ships fully tested and ready to go.

This battery is designed for the Asus U53 series, U52 Series and U42 Series laptops. Any Asus computer model that begins with these model numbers uses this battery.

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 laptop battery replacement is typically superior to the original battery and is 100% compatible with your Asus U53 notebook computer. The battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.

You can expect about 4 - 5 hours of run time with this Asus U53 battery when new, depending on your energy use. The battery cells inside this cartridge have an energy capacity of 5200 mAh. This battery will be compatible with batteries rated at 4800 or 4400 mAh capacities.