NOCO Genius smart battery chargers are some of the safest and most advanced on the market. One of our best, the G4 4-Bank Battery Charger and Maintainer is designed to charge 12-volt lead-acid and lithium-ion batteries up to 40Ah. It can also effectively maintain automotive, marine, RV, powersport, lawn & garden and deep-cycle batteries. It chargers 2x faster than ordinary battery chargers, can repair damaged batteries and is designed for use with micro-hybrid start-stop vehicles and CANBUS electrical systems. Guided by an on-board microcomputer, the G4 monitors battery activity for safe and efficient charging, automatically minizes energy consumption and provides redundant levels of safety protection, including spark-proof technology, as well as reverse polarity and overcharge protection. It can remain safely connected 24/7, while its streamlined design makes it ultra-compact, portable, and incredibly lightweight. The G4 features external mounting holes and a rubberized base that avoids surface slipping and scratches, while remaining impact, UV and water resistant (IP65). Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode. Designed for use on 120-volt 50-60Hz electrical systems and includes X-Connect battery clamps with integrated eyelet terminals, as well as a 5-year limited . DC Cord- 60-Inches (16AWG), AC Cord- 60-Inches (18AWG).Charge up to four different batteries at the same time.