Circuit breaker
That little box is a small, resettable circuit breaker. At some point, too much current was drawn and it tripped. It could have been when hooking up batteries with an active load (fans, lights, refrigerator on), or if a wrench accidentally touched something it shouldn't have.
If it doesn't recur, no problem.
__________________
Larry
"Everybody's RV is not like your RV."
"Always take pictures with the button on the right."
"Always bypass the water heater before opening the low-point drains."
Sticks and Bricks: Raleigh, NC
2008 Cherokee 38P: at Ivor, VA permanently
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