THE ISSUE IS AND THE OP QUESTION WAS
The owner does not wish to check water level
No rig on the face of the earth can be TRUSTED to not have battery drain without a total cutoff switch. When a non antimony battery is ISOLATED with a switch it will endure 6-months of storage with a laugh.
I do desperately try to answer an OP's question. Later on with subsequent answers in the thread I will drift. Maybe you came later on to the forum. Early on I posted caveats about my grumpiness, and enduring sarcasm. You ain't seen sarcasm until you see my self-sarcasm when I get caught posting erroneous information. And I race to thank folks who point out the errors, with clear self-denunciation. I have received more messages with laughing thank-you's than I care to count. My sarcasm is meant to give the person a smile. When someone points out something I wrote with a sarcastic tone - I first fall off my chair laughing WITH tham then it's WW III. Maybe I watched too many W.C. Fields, flicks as an adolescent. I definitely worship Mark Twain, Will Rogers and Groucho Marx.
So please do not feel insulated or picked on. I am truly democratic with my sarcasm. When I do it in Spanish down here (the humor is endemic) it leaves everyone rolling on the floor.