50 Amp Battery Charger with Maintenance Charging and Battery Desulfation. Achieve more with the Geniuspro 50. A multi-voltage charger - 6 volts (50 amps), 12 volts (50 amps), and 24 volts (25 amps) - for many different types of batteries. An integrated thermal sensor detects the ambient temperature and adjusts the charging to prevent overcharging in hot climates and undercharging in cold climates, maximizing battery life and enabling fast charging. The Geniuspro detects and charges batteries that are discharged down to 1 volt. Thanks to the completely new Force Mode for depleted batteries, the charging process can even be manually initiated down to zero volts.