MicroGenius 300 Battery Charger. The M3-22-1210-A MicroGenius 2 is a switchmode, regulated, filtered, microprocessor-controlled, current limited battery charger designed for heavy-duty industrial service. This “power only” base model charger is packaged in a full enclosure, includes 12V and 24V output voltage, as well as J1939 and Modbus communications (RS485 on RJ-45 port). Rated: 12A @ 12V; 10A @ 24V.