It sounds like you are both correct, in that I could run without one, but Dave's point about the brakes
is a good one. I went and bought a new battery today, anyway, and it's installed.
My problem has been that I just bought this trailer in early April and and I'm working through those "unknown" things. It's in excellent shape but I think the battery was shot when I got the Casita
. I checked it, when I got home, and it was very dry, I filled the cells, and then we went on a 3,000 mile trip and then the battery went dead about 2/3 of the way home. When I took it out yesterday, it was BONE DRY and I'm sure it had boiled itself dry. I filled it up again and put it on the charger last night and this morning it was just "boiling away" so I shut down the charging and bought a new one.
Steve L, and some reading I've done on this forum have convinced me that some of the cells were bad so both the trailer system and my charger were trying to charge a bad battery, hence the boiling.
I checked the output of the Contol/Converter in the trailer on the battery wires and it was about 13.7 or so as near as I could tell. So that shouldn't hurt the new battery, I hope. Now I'm going to look into a battery disconnect switch and install a meter so I can read the Battery "state" from inside the trailer. I think I've read about all that here on this forum. Hope I can find it now.
Thanks to both of you.