Solid state automatic charger has shutoff when battery is fully charged, then reduces to a maintenance level. Special circuit for maintenance-free, deep cycle, low maintenance and conventional batteries. Recharges automobile batteries in 3 to 5 hours andrecreational deep cycle batteries in 6 to 12 hours. Silicon control rectifier senses battery condition to prevent overcharging. 1 switch allows for manual or automatic use. UL Listed.