The Battery Minder on board desulfators are made for 12V to 48V lead acid battery systems. They use resonant frequency pulsing to break apart sulfate crystals on the molecular level. These on-board desulfators or OBD\'s are NOT chargers and will NOT recharge your battery system. They do however work in conjunction with your current charging system and have a convenient SAE plug-n-play charging port to allow quick and easy charging access to your batteries. All of the OBD units come standard with an easy to understand battery state of charge readout.