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 Package List 4 x Lithium Battery Balance Module