MK 345 On-Board Charger Minn Kota's On-Board chargers are fully automatic 3-stage charging (bulk, absorption and maintenance). Automatic temperature compensation delivers fast charging recovery, even in extreme temperatures, while protecting your batteries from overcharging. Waterproof, shock and vibration resistant construction. Short circuit, reverse polarity, and ignition protected. FCC compliant. UL listed to marine standard 1236. 3-Year warranty with free replacement for defective units during warranty period. Item: 799697 BS: X03230 OEM: 1823450