Stop in for a cup of coffee
The big one Hoppy has (or had) may hold a steady current. I know some of the current analog chargers have two or three switches, 2 amp, 5 amp, 10 amps.
My Safe-Fast charger seems to be voltage regulating, not current regulating.
If I have a voltmeter across the battery terminals, the higher I set the charger, the higher the voltage it applies. As the battery charges up, current flow drops.
But I see voltage will sometimes drift upward too.
But basically its a good design. Put 15 Volts or less across it, and it will not overcharge a typical 12 Volt battery.
Originally the charger had thermostat probe to stick in one of the battery cells. As the battery warmed up, or if it got too warm, the charger would compensate or turn off. I really don't know. It was hacked repaired when I was a teenager. Dad didn't care. Someone fixed it for him and we didn't need to buy a new one - that's what mattered. Never saw it work as designed and have not found info on it.
The big one Hoppy has (or had) may hold a steady current. I know some of the current analog chargers have two or three switches, 2 amp, 5 amp, 10 amps.
My Safe-Fast charger seems to be voltage regulating, not current regulating.
If I have a voltmeter across the battery terminals, the higher I set the charger, the higher the voltage it applies. As the battery charges up, current flow drops.
But I see voltage will sometimes drift upward too.
But basically its a good design. Put 15 Volts or less across it, and it will not overcharge a typical 12 Volt battery.
Originally the charger had thermostat probe to stick in one of the battery cells. As the battery warmed up, or if it got too warm, the charger would compensate or turn off. I really don't know. It was hacked repaired when I was a teenager. Dad didn't care. Someone fixed it for him and we didn't need to buy a new one - that's what mattered. Never saw it work as designed and have not found info on it.