Autonomy OpenRov Cockpit

I’m building a ROV for my high school project. Actually, we are in the right way, but I don’t know how I can get the autonomy of the ROV. I’ve seen that there is a “Battery” module on Cockpit, but I don’t understand how it works. I changed the battery settings in “settings”, but I don’t know if it makes a difference…

Could you help me ?

Thanks !