4.4 Amp 4-Bank UltraSafe Smart Battery Charger <br /> Charge fully drained lead-acid and lithium-ion batteries up to 40 amp-hour with zero overcharge - Stay safely connected 24/7. <br /> Ultimate performance and versatility. Charge 6-volt and 12-volt batteries, recover damaged batteries, suitable for micro-hybrid start-stop vehicles and works with CANBUS electrical systems. <br /> Ultra-compact, portable, energy-efficient design that's impact, UV and water-resistant (IP64). <br /> Actively monitors battery for safe and efficient charging. Includes spark-proof technology and reverse polarity protection. <br /> Advanced diagnostics automatically tests and detects a bad, damaged, or shorted battery.