4-20 string universal, can be directly downgraded, no need to Scope of application: 18650 special lithium battery protection board, scooter, drift car protection board, solar street light, LED protection board, motorcycle lithium battery protection board, tricycle protection board, backup lithium battery protection board Continuous Discharge Current: 45A Instantaneous discharge current:150A Charging voltage: 75V 20 string 72V LiFePo4 battery protection board With Balance port 45A Maximum charging current: 45A Overcharge detection voltage: 3.75+/-0.025V Overcharge protection delay: 100ms Overcharge release voltage: 3.6+/-0.05V Battery balance detection voltage: 3.6+/-0.025V Battery balance release voltage: 3.6+/-0.05V Battery balance current: 40+/-5mA Overdischarge detection voltage: 2.1+/-0.08V Overdischarge detection delay: 100ms Overdischarge release voltage: 2.3+/-0.1V Overcurrent detection voltage: 150mV Overcurrent detection delay: 10ms Overcurrent protection current: 180+/-10A Overcurrent protection release condition: disconnect load Short circuit protection condition: external load short circuit Short circuit detection delay: 300uS Short circuit protection release condition: disconnect load Main circuit conduction internal resistance: less than or equal to 15m Working current: less than or equal to 50uA current (when the battery is over-discharged): less than or equal to 10uA Temperature range: -30/+80 Celsius colour:Silver + green Material:Metal + PCB Size: 122*66*10mm Package Contents: 1x Li- Battery Protection Board 1x set Cabel wire Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.