This is a 3 Bank Lithium & AGM Marine Battery Charger perfect for charging 12v AGM or 12v LiFePO4 batteries. This charger has built in automatic low voltage cut off charging activation. This means when you run your lithium batteries all the way down they will reach what is called low voltage cut off, when this is reached the BMS (battery management system) basically turns the battery off at this point showing zero to little voltage to where most chargers won't recognize that there is a battery connected. This charger will recognize it and will activate charging on low voltage lithium's automatically. This charger is 100% waterproof!