There are 3 screws at the bottom of the pedal, this is the battery cover, when it comes time to change, remove the theree screws and use a piece of masking tape to slide the battery out of the holder.

 

Landmine foot pedal's battery can last 300 continues working hours. The stand by mode is 200 days which the led starts to dim, the battery will need to be changed. Battery mode: CR2450.