What kind of batteries are you all using?
After we got rid of the 2HN lead acid batteries and went to OPTIMA, we had almost no problem with batteries discharging. And the Army also bought a positive battery clamp with a disconnect switch built into it. It was a Knife type switch. Simply lift up the handle, no contact to the battery. I NEVER saw a dead battery again on any generator due to not running/charging the batteries again on those sets. It was a off the shelf buy, not given a NSN. We equipped a PATRIOT Battalion with them, about 60 generator total. Worked like a charm.