Name: Protection Board Charging voltage: 16.8V Continuous discharge current: 0-30A Overcurrent protection current: 40A-50A Overcharge Protection Delay: 1S Length*Width: 34.8*34.4mm (1.37*1.35in) Operating Temperature: -40°-85° RH≤75% Store Temperature: -40°-125° RH≤75% The protection board is for 4 series Li-ion batteries, mainly used for electric power tools. It uses special IC for 4S lithium batteries as processor to detect real-time voltage, charge and discharge current and ambient temperature of each battery. Stable various protective functions for charging and discharging, such as overcharge protection, over-discharge protection and short circuit protection. Low power consumption, the working current is about 25uA and quiescent current is about 6uA. Choosing the correct protection board and applying it appropriately is to your batteries. Package Listing: 1Pc Attention: There may be differences in wiring color, base plate color, or other aspects between the actual product and the linked image, but the functions are exactly the same. If you cannot accept it, please think carefully before making the payment! Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.