[Overcharge protection] Overcharge single cell detection voltage: 4.25V; Overcharge protection delay: 1S; Overcharge single cell recovery voltage: 4.13V; Overcharge protection release delay: 1mS [Over discharge protection] Over-discharge single cell detection voltage: 2.8V; Over-discharge protection delay: 1S; Over-discharge single cell recovery voltage: -3.0V; Over-discharge protection release delay: 10020mS [overcurrent protection] Overcurrent detection voltage: 0.4V; Overcurrent detection current: 305A; Overcurrent detection delay: 1S; Recovery status: automatic recovery [Short circuit protection] With or without short circuit protection: yes; Short circuit detection delay: 250uS; Short circuit release delay: 1S; Short circuit detection voltage: 0.5-0.8V; Recovery state: automatic recovery after disconnecting the load [temperature protection] Over temperature protection temperature: 705; Over temperature recovery temperature: 555 [Power consumption] Working status: 25uA (25); Sleep state: 6uA (25) [temperature protection] Working temperature: -40-85 Relative humidity75%; Storage temperature: -40-125 Relative humidity75% [Voltage] Charging voltage: 21V; Single-cell charging voltage: 4.25V [current] Continuous discharge current: 8-20A Internal resistance: Discharge main circuit internal resistance: 305m Material: PC+Metal colour: As shown Package Contents: 2 x Protection board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.