This brand new Asus X401 X401A X401U replacement laptop battery features lithium-ion cells. Li-ion battery technology provides longer run times with less weight.

Li-ion batteries are not subject to the memory effect common with older battery technology. This Asus A42-X401 battery is 100% compatible with the original battery specifications and is individually tested and backed by a 2 Year warranty.

You can expect about 2 - 3 hours of run time with this Asus A42-X401 battery when new, depending on your energy use.

This battery replaces the Asus X401 X401A X401U series batteries and a host more which are listed at the extreme bottom of this web page.