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: Minimum Typical Maximum Unit Note Working Voltage 19.6 29.75 V Circuit normall working range Quiescent Current 20 50 μA Single battery voltage 3.6V Operating Temperature -20 +70 ℃ Normall operating temperature range Relative Humidity 90% No condensation Storage Temperature -40 +85 ℃ Humidity is less than 90%, no condensation Altitude 4000 M Charging Voltage 29.75 V CC-CV Function Test Item Symbol Test Condition