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High-accuracy voltage detection circuit, fine workmanship and durable. Highlight: Over-discharge protection, overcurrent protection, overcharge protection; High charge and discharge current; Compact size and lightweight. Conditions for Starting the Drill: To successful starting the drill requires three 15C-20C power batteries, or six 10C-15C power batteries. For connecting cables, use copper wire over 3 square millimeters, the shorter the better (can not use nickel plate!!!). MOS transistor can control the battery charge and discharge, low standby current consumption.