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A multi voltage battery charger could be built by anyone with some reasonable knowledge of electronics.
Use a current source (high wattage reostat or solid state transistor design) from say 36 volts (charge all up to about 28 volts).
Then a switched arrangement of voltage sensors (Zener diodes) to automatically turn off the charge when the battery terminal voltage reaches the prescribed fully charged state.
Barry
PS I have never thought of this before. It is the solution to my broken 48 volt charger on the golf buggy.
B.G
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