This is a brand new Asus C21N1819 battery. You can expect about 6 hours of battery life with this Asus C21N1819 battery when new, depending on your energy use. The battery cells inside this cartridge have an energy capacity of 4900 mAh.

This Asus C21N1819 Battery replaces the original battery in the VivoBook 14 A420UA, X420UA, X420U, and R459UA models. Additional compatible models and battery part numbers are listed below.

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