Hello James4Artona,

Here is the link to the owners guide and if you look on page 232 their it explains how to replace the battery.  https://dell.to/37j5HR6  

Here is the Dell Part# D668J just in case you need to purchase one if your system is out of warranty.

Please let us know if you have any other questions.

Hi Dell Support,

Thanks for your reply. The part number of battery module is helpful .