1. Voltage charging voltage 21V. Single cell charging voltage 4.225V 2. Current Continuous discharge current 8-20A 3. Overcharge protection, overcharge single cell detection voltage 4.225V Overcharge protection delay 1S Overcharged single cell recovery voltage 4.125V. Overcharge protection release delay 1mS Over-discharge protection, over-discharge single cell detection voltage 2.7V Over discharge protection delay 1S Over-discharge single cell recovery voltage 3V Over discharge protection release delay 1S Over current protection Over current detection voltage 0.1-0.2V Overcurrent detection current 305A Overcurrent detection delay 1S Recovery status Automatic recovery Short circuit protection Is there short circuit protection? Short circuit detection delay 250uS Short circuit release delay 1S Short-circuit detection voltage 0.5V Recovery status Automatic recovery after disconnecting the load Temperature protection Over temperature protection temperature 705 Over temperature recovery temperature 555 consumption working state 25uA (25) state 6uA(25) Internal resistance The internal resistance of the main discharge circuit is 305m Temperature protection Working temperature -40-85 Relative humidity 75% temperature -40-125 Relative humidity 75% Size Length x Width 92 x 62 (mm) Color: green Material: PC+Metal Package Contents: 1 x Lithium battery protection board 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.