8 gallons. But there was a lot of spillage. Not easy hitting those holes with the tangle of cables all over the place.
Regarding disconnecting negatives, definitely. Fortunately they're hooked up in parallel. Technically. They're not laid out that way, though, hence the tangle of cables.
I'm extremely cautious around these batteries because not only have I had batteries blow up on me twice, I'm always acutely aware of the fact that when I'm messing with these batteries, I'm basically playing with a very strong welder that's always on.
I'm going to take them all out and test them as you suggest, but won't be putting them back in. I'm going with better batteries. And will wire them differently so it's a lot easier to check electrolyte levels. And am seriously considering wiring them for 12-volt input and 48-volt output so I can put a decent Trace inverter in the trailer and be able to run an air conditioner.
