Specification: Voltage: Charging voltage: 21V Single-cell charging voltage: 4.225V Current : Continuous discharge current: 8-20A Overload protection: Overload protection single cell detection voltage: 4.225V Overload protection delay: 1S Overload protection single cell recovery voltage: 4.125V Overload 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: 3.0V Over-discharge protection release delay: 1S Over- current protection Over-current detection voltage: 0.1-0.2V Over - current detection current: 30 5A 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: 0.5V Recovery state: automatic recovery after disconnecting the load Temperature protection: Over temperature protection temperature: 70 5 Over temperature recovery temperature: 55 5 Power consumption: Working status: 25uA (25 ) Sleep mode: 6uA (25 ) Internal resistance : Discharge main circuit internal resistance: 30 5m Temperature protection: Working temperature: -40 -85 Relative humidity 75% Storage temperature: -40 -125 Relative humidity 75% Size : L*W: 56*58.3(mm) Package Includes: 1* Battery Charge Board Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.