Features Easy Carrying: Comes with small size and lightweight, you can easily take this board with you to help with your work. Accurate Detection: This board features high voltage circuit detection, possesses fine workmanship, durable. MOS Transistor: MOS transistor of this board can control the charge and discharge of the battery. You can take it with confidence! Low Power Consumption: This board is small in size and low in power consumption, with an low standby current consumption. PCB Board: Made of PCB board, this battery balance board is wear resistance, and corrosion resistance, it has a long life span. Specification: Item Type: Lithium Battery Balance Board Material: PCB Charging Voltage: 16.8V-18.1V Continuous Discharge Current (upper limit): 40A (if the cooling environment is bad, please reduce the load current for use) Continuous Charging Current (upper limit): 20A Standard Version: Applicable to electric drills with starting current below 60A and power below 100W. Enhanced Version: Applicable to electric drills with starting current below 80A and power below 135W. Equalizing Version: Applicable to electric drills with starting current below 80A and power below 135W Package List:4 x Lithium Battery Balance Board Package List 4 x Lithium Battery Balance Board