NOCO Genius GEN2 20 Amp 2-Bank Waterproof Smart On-Board Battery Charger 20 Amperes (10 Amperes per bank) Smart On-Board Battery Charger for 12-volt batteries; charges and maintains all types of lead-acid batteries from 25-230Ah, including Wet, Gel, MF, and AGM Designed for safety; safe for anyone to use; does not generate sparks, and protects against reverse battery hookup, short circuit, open circuit, overheat, overcurrent and does not overcharge the battery 100 percent waterproof; completely sealed to protect against the most extreme environments and rated at IP68 Rapid Charging Technology; Charges batteries 2X faster than traditional battery chargers, and a lightweight, compact design The most advanced charger ever; it features innovative and advanced technology that makes charging easy and simple; the charger makes important charging decisions so you dont have to. It is the safest, most effective charger you may ever use