Features COMPACT AND PORTABLE: Lithium battery balance module come with high charge discharge current, compact size, light weight FINE AND DURABLE: Possess high accuracy voltage detection circuit, made with fine workmanship, very durable ENERGY SAVING: MOS transistors can control the battery charge and discharge, standby current consumption is low RELIABLE PCB: Adopt excellent PCB materials, with reliability and miniaturization, good maintenance and interchangeability 4PCS IN TOTAL: The package contain a total of 4pcs PCB cell board, enough for you to replace and use, very convenient Specification: Item Type: Lithium Battery Balance Module Material: PCB Charging Voltage: 16.8V-18.1V Continuous Discharge Current(upper limit): 40A (if heat dissipation environment is not good, please reduce load current) Continuous Charging Current(upper limit): 20A Standard Version: Suitable for starting current below 60A, power below 100W drill Enhanced Version: Suitable for starting current below 80A, power below 135W drill Balanced Version: Suitable for starting current below 80A, power below 135W drill Package List: 4 x Lithium Battery Balance Module Note: 1. Successfully starting the drill requires 4pcs 15C‑20C power batteries, or 8 10C‑15C 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 10uF‑100uF), to prevent the motor generated by the reverse peak voltage interference protection plate or breakdown of MOS tube. Package List 4 x Lithium Battery Balance Module