Talking you through how to get into the Victron Energy Lithium 12.8v 100ah Battery (others too I expect), and then how to tighten up the Battery Terminals or repair the signal wires.
The symptoms I had for this were in my campervan, when a major draw came online (like the diesel heater) it would cut out due to low voltage.
This fixed the issue.
It's an easy thing to check.
I personally did not reglue the top down as there's going to be some terminals on top and it's in a place where it's boxed in.
If I were to glue it back on, I'd use some standard cheap superglue which would work like the original stuff.

Hope it helps!