Battery stopped taking a charge

[pinktrailer]

Everything was working fine when I camped with my Overlander two weeks ago. I was boondocking for five days, and I still had an okay level left in my battery when I came home.

I plugged in for about twenty four hours before I took off last week, and when I left on Friday afternoon, I had a full charge. I was at a campground with full hookups, so I plugged in. When I unplugged in to leave three days later, my battery was totally dead. It didn't charge at all while traveling to the next stop on our caravan, and same thing happened at the next campground. I had nothing without being plugged in.

The converter sounds like it is running properly, and it's fuses are okay. I am figuring (hoping) it is one of those fuses in my battery box. They are a pain in the butt to check, so I haven't done it yet, but I will check them out in the morning. Any other suggestions, if this isn't it?

[Phoenix]

Did you check the battery voltage with everything disconnected? From what you describe, it sounds like the battery might have gone bad. I would definitely check the battery thoroughly before doing much more troubleshooting on other things.

[Aage]

Age of battery? Method of testing for voltage remaining? Type (brand, age) of converter?

Just the facts, ma'am...

[rangerchief]

can somebody tell me what that thingy is in the battery compartment. Found it not connected to battery. should it be connected? trailer is plugged to 110.