Get longer battery life and improved laptop performance with a new Asus C21N1818 battery. This Asus C21N1818 battery is compatible with the ExpertBook P1, VivoBook 15 and VivoBook 17 models. Additional compatible models are listed below.

Asus made four different versions of the C21N1818 and B21N1818 batteries. This is the Type 1 version of the C21N1818 battery. The Type 1 battery has several small tabs along the top, bottom and sides of the battery. To make sure you order the correct battery you may need to open up your laptop and see what replacement battery you may need. It should match up with the photo on this page. Here you can find the four different Asus B21N1818 batteries.

Don't sweat it if you order the wrong battery. We will exchange the battery with the correct one free of charge, including all shipping costs.

We use the highest quality lithium-ion batteries that charge faster, last longer and weigh less than cheaper, lower quality batteries. Lower quality batteries can wear out in as little as six months. Our batteries can last up to 5 years if properly cared for.

This Asus C21N1818 battery is 100% compatible with the original Asus battery specifications and is individually tested and backed by a 1 Year warranty.