Feature: Utilizing a dedicated IC for 5 series lithium batteries as a processor. Real-time monitoring of battery voltage, charging and discharging current, and ambient temperature. Protections against overcharging, over-discharging, discharge overcurrent, short circuits, charging overcurrent, and temperature variances. High-quality electronic components ensure the stable and reliable performance of the lithium battery protection board. Commonly used for battery packs in power tools utilizing 18650 lithium batteries. Item Type: Lithium Battery Protection Board Model: Suitable for a specific brand 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 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: 70°C Over Temperature Recovery Temperature: 55°C Power Consumption: Working Status: 25uA (25°C) Dormant State: 6uA (25°C) Internal Resistance: Discharge Loop Internal Resistance 305mΩ Size: Length x Width: 80 x 63.5mm / 3.1 x 2.5in Temperature protection: Working temperature: -40°C - 85°C, Relative humidity 75% Storage temperature: -40°C - 125°C, Relative humidity 75% Package Contents: 2 x Protection Circuit Board Only the contents listed above. Other products are not included. Note: Light reflection and variations in displays may cause the item's color in the picture to differ slightly from the actual product. Measurement errors are allowed within +/- 1-3cm.