Features: The protection board is for 7 series 18650 li-ion 3.6V/3.7V batteries. Stable various protective functions for charging and discharging, such as accurate overcharge protection, over-discharge protection, over current protection and short circuit protection. Batteries core hardware balanced processing, proper balanced current, reasonable balanced heat emitting, does not affect performance of battery pack. It has aluminum sheet that would enhance heat dissipation for MOS tube, and extend the service life of MOS tube. Low quiescent power consumption, it can save energy. Specification: Size: 65*33*7mm / 2.56*1.3*0.27" Wire Length: 350mm / 13.77" Package list: 1 * Protection Board The lithium battery protection board is for 7 series 18650 li-ion 3.6V/3.7V batteries. The Protection Board adopts aluminum sheet that would enhance heat dissipation for MOS tube and extend the service life of MOS tube. 24V 20A 7S lithium li-ion liFePO4 battery battery BMS protection board with low quiescent power consumption, it can save energy. Batteries core hardware balanced processing, proper balanced current, reasonable balanced heat emitting, does not affect performance of battery pack. Stable various protective functions for charging and discharging, such as accurate overcharge protection, over-discharge protection, over current protection and short circuit protection.