Feature:1. COMPACT AND PORTABLE: Lithium battery balance module come with high charge discharge current, compact size, light weight2. FINE AND DURABLE: Possess high accuracy voltage detection circuit, made with fine workmanship, very durable3. ENERGY SAVING: MOS transistors can control the battery charge and discharge, standby current consumption is low4. RELIABLE PCB: Adopt excellent PCB materials, with reliability and miniaturization, good maintenance and interchangeability5. 4PCS IN TOTAL: The package contain a total of 4pcs PCB cell board, enough for you to replace and use, very convenientSpecification:Item Type: Lithium Battery Balance ModuleMaterial: PCBCharging Voltage: 16.8V-18.1VContinuous Discharge Current(upper limit): 40A (if heat dissipation environment is not good, please reduce load current)Continuous Charging Current(upper limit): 20AStandard Version: Suitable for starting current below 60A, power below 100W drillEnhanced Version: Suitable for starting current below 80A, power below 135W drillBalanced Version: Suitable for starting current below 80A, power below 135W drill.Package List:4 x Lithium Battery Balance ModuleNote:1. Successfully starting the drill requires 4pcs 15C20C power batteries, or 8 10C15C power batteries (ordinary 18650 can't start the drill!).2. Wire 0V, 4.2V, 8.4V, 12.6V, 16.8V strictly according to the drawing, do not intentionally short circuit.3. with the load of brush motor, as far as possible in the motor positive and negative terminals in parallel with a non polar capacitor(voltage resistance of more than 25V, capacity of 10uF100uF), to prevent the motor generated by the reverse peak voltage interference protection plate or breakdown of MOS tube.4. If four groups of batteries are connected in series, ensure that the voltage of each group is the same. If the voltage is different, charge each group of batteries separately and use them in series. In the discharge test, the battery with the faster voltage drop is the differential battery. For some customers with poor electronic basis explain: balanced charging is only an auxiliary function, try not to use the good battery and the bad battery together! The closer the capacity or internal resistance of the four batteries is, the better! (3 good batteries and 1 bad batteries = 4 bad batteries).