The battery model for the Accent car key.

Why doesn't my Accent have a remote key?

Mine is a 2016 model.

You can buy this directly online by entering the key model, or you can go to an auto parts market and get it for a few bucks. The battery model for the key is a 2032 button cell.

The remote key for this model uses a standard button battery, which you can buy at local repair shops or online for around ten yuan.