Hah yeah Yowsa. Was the battery just depleted? I mean a single charged battery won't last all day (or even several matches).
If the battery wasn't charged then its a no brainer.
If it was charged then maybe Battery-Beak it to see if the battery has higher-than-normal battery-resistance (basically a bad battery).
If the battery itself is ok, inspect all the contact points from the battery to to the 120A breaker, and then into the PDP. Tighten the nuts on the 120A breaker if they are loose.
Does that happen with all batteries, some batteries, or just that one?
Also try not to run down FRC batteries to that point. It reduces the life of the battery, and batteries aren't cheap
