Ujjdwiurgh 5S 21V 40A Li-Ion Lithium Battery Pack Charging Protection Board Charger Protection Board for

It uses special IC for 5S 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. 100% new and high quality. The protection board is for 5 series Li-ion batteries, mainly used for electric power tools. Choosing the correct protection board and applying it appropriately is vital to the your batteries.