The Powermax PM3 AC to DC Converter/Charger is a fantastic converter/charger that works tremendously well with Battle Born 100Ah 12V LiFePO4 batteries! The most prominent feature of this charger is the ability to manually adjust the charging voltage. This is huge for LiFePO4 batteries because it enables the user to charge their LiFePO4 batteries to the ideal 14.4 V and get the most life and power out of their battery!