I am in need of a simple (read low cost) way to signal that a 
lead/acid 12 volt gelcell is in need of recharging. I have in mind a 
device or whatever that will turn on an LED when the recharge point is 
reached. Is there such a critter?

Any enlightenment will be appreciated.


Circuit here

        http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMonitor.html

Something even simpler that works moderately well could be designed.
Lead Acid voltage is fairly flat across most of capacity and drops 
more sharply towards end of capacity. How close to end you get for a 
given voltage depends on discharge rate and temperature (and other 
factors).


        RM


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