Feature: Adopting a 5 series lithium battery-dedicated IC as a processor. Real-time detection of battery voltage, charge and discharge current, and ambient temperature. Overcharge, overdischarge, discharge overcurrent, short circuit, charge overcurrent, temperature protection, etc. High-quality electronic components the stable and reliable performance of the lithium battery protection board. Widely used on battery packs for power tools using 18650 lithium batteries. Item Type Lithium Battery Protection Board Model XL-MH99V5 2(or MH99V51-S)Number of Series 5 Series. Voltage Charging Voltage 21V. Single Charge Voltage 4.225V Current Continuous Discharge Current 8-20A. Overcharge Protection Overcharged Single Section Detection Voltage 4.225V Overcharge Protection Delay 1S. Overcharged Single Section Recovery Voltage 4.125V. Overcharge Protection Release Delay 1mS Overdischarge Protection Over-Discharge Single-Section Detection Voltage 2.7V Color: Green Material: PC+Metal Over-Discharge Protection Delay 1S Over-Discharge Single-Section Recovery Voltage 3V Over-Discharge Protection Release Delay 1S Overcurrent Protection Overcurrent Detection Voltage 0.1-0.2V Overcurrent Detection Current 305A Overcurrent Detection Delay 1S Recovery Status Automatic Recovery Short Circuit Protection With Or Without Short Circuit Protection With 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 Load Temperature Protection Over Temperature Protection Temperature 705 Over Temperature Recovery Temperature 555 Power Consumption Working Status 25uA (25) Dormant State 6uA(25) Internal Resistance Discharge Loop Internal Resistance 305m Size Length x Width . 80 x 63.5mm / 3.1 x 2.5in Temperature protection Working temperature -40C-85C Relative humidity75% Storage temperature -40C-125C Relative humidity75% Package Contents: 2 x Protection Circuit 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.