Amps is amps. Volts vary. Most chargers put out 14.5 volts to charge your auto/truck starting battery which is fine for any 'wet' lead-acid battery.
When you get into charging optimas or agm types, lower and slower is better for the battery: 13.5 volts at 2 to 6 amps.
For restoring tired 'wet' batteries, an older charger that will put out 16 - 18 volts at 2 to 4 amps will regenerate the tired battery when a standard charger will not. Do be careful doing this: if the battery gets hot, cease and desist as it is too sulfated to regenerate and May explode. Btdt.