12 volt car/bike battery discharger/charger/charging machine price. 350V-40A-70A-6 circuits battery charger and discharger, This machine adopts microcomputer control insulation gate bipolar transistor (IGBT) DC-DC technology, a microcomputer controls each channel of power supply, each channel works independently, the same system circuit shares a group of DC bus, the circuit obtains electric energy charge from the bus during charge, the circuit sends electric energy back to the bus during discharge.