Schauer Charge Master CM6A Maintenance Battery Charger Automatic Charger & Desulfator: 12 Volt, 1/4/6 Amp Listed in California Appliance Efficiency Database. Selectable battery type: Wet, Gel, and AGM Sealed Lead Acid. Quick-disconnect battery clips and ring terminals. Maintains, extends battery life, and never overcharges. Ideal for winter battery maintenance!