I would suggest any AGM true deep cycle that fits. That yellow top was a combination starting/deep cycle marine battery, a compromise. Not the best choice for this application.
I would also suggest putting an on/off master disconnect switch on it, that way you know it is disconnected.
If you have access to the sun nearby, perhaps a small solar battery maintainer would work for you.
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Tick tock, baby(Ironbuttal)
2000 Roadtrek Chevy 200 Versatile(sold)
'98 Safari Trek 2480
Just for fun:'15 Kawasaki Versys650LT
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