Back in 2013,we ran 2 xs power batteries and one optima battery in a 3.0 truck IIRC. Never had an issue with anything getting drained. They powered guages, an electric water pump, hydraulic steering, electric fan, and water pumps in the weight box. I'm just trying to remember if the xs power batteries were 12v or 16v. Even on days with multiple hooks they only took a few mins to charge.