GEN Mini On-Board Smart Battery Chargers are rugged and compact waterproof chargers for 12 volts lead-acid batteries. They can be mounted onto virtually any vehicle, like a boat, car, tractor, or RV. Safe to leave connected indefinitely, the GEN Mini interactively diagnoses, recovers, and charges wet, gel, MF and AGM batteries from 20-120 ampere hour and maintains all battery sizes. The GEN Mini is a smart battery charging solution for rugged environments, and includes multiple innovative features, such as 100 percent waterproof design, automatically recovers sulfated batteries, charges multiple battery chemistries, designed for user safety, protects against abnormal conditions, small, compact design, optimizes a battery's specific gravity, charges 2X faster than traditional chargers, works with varying AV voltages, and ignition protected. GEN Mini On-Board Smart Battery Chargers are rated at IP68, ETL approved for United States and Canada, and comes with a 5 year limited warranty.