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 A 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 Minimum Typical Maximum Unit Over Charge Protection Voltage Vc1 At charge off 4.200 4.250 4.300 V Delay Time Tc1 / 10 1000 1700 mS Relieve Voltage Vc2 / 4.150 4.190 4.240 V Charging Current Normal Ioc / 20 A Balancing Function Start Voltage / 4.150 4.200 4.250 V Balancing Current / 20 35 mA Over Discharge Protection Voltage Vd1 At discharge off 2.700 2.800 2.900 V Delay Time Td1 / 10 200 500 mS Relieve Voltage Vd2 / 2.900 3.000 3.100 V Recovery Condition / / Disconnecting load Over Current Portecion Over Current 1 Protection Current Ioc1 60 100 A Over Current 1 Protection Delay Time Toc1 20 200 mS Discharge Over Current Relieving Over Current Protecion Recovery Condition / / Disconnecting load Discharge Current Max. Continuous Discharge Current Ioc - - - 20 A Short Circuit Protection Delay Time Tshort 300 600 S Recovery / / Disconnecting load Internal Resistance Discharge Circuit Internal Resistance(m) Ron1 / / 20 mR Self Power Consumption Working Mode Icc1 / 20 50 A Size: 65*33*7mm / 2.56*1.3*0.27" Wire Length: 350mm / 13.77" Package list: 1 x Protection Board Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.