@ServiceXp I'm not sure. I looked around for similar devices almost a year ago, and didn't find any consumer grade chargers or monitors which had such, though there were a few commercial devices for the larger flooded cells which appeared to monitor the fluid level somehow. Some even monitored the specific gravity of the electrolyte, but I'm sure those cost more than several 'basement watchdogs.
I suppose I could try to decode the simpler-looking circuit on the 'emergency' model and try to figure out what it was doing, but I think I've forgotten what little I actually learned in Circuits class back in college.
