> Or a stepper motor, a flag, and a friction element to keep the 
> position... but this is again far into the impractical.

It might or it might not. The OP didn't actually say, AFAIK, what the
conditions are. We're all assuming this is a "low power" application

He might have a vintage U-Boat and would like to know that it's
probably a good idea to surface and crank up the generator

The other thing is that a discharge curve in this application might be
predictable, and a warning can be issued before a critical point

A piezo beeper might be useful. Doesn't use a lot of power and
grabs one's attention



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