Tests and delivers only what the battery needs without ever overcharging or undercharging Maintains any type of 12V lead-acid or 12.8V lithium battery from 2Ah-20Ah Global input (100 V - 240 V; 50 Hz - 60 Hz), high-efficiency (CEC listed) Premium charge accessory cables are included Delivers a constant 600mA current Low volt start of 4V Four-step program. CHARGER OPTIMATE1DUO DRAG