The protection board is used for 5 series lithium-ion batteries, mainly used in power toolsIt uses an IC dedicated to 5S lithium batteries as a processor to detect the real-time voltage, charge and discharge current and ambient temperature of each batteryStable charge and discharge protection functions such as overcharge protection, over-discharge protection and short-circuit protectionLow power consumption, working current of about 25uA, static current of about 6uAChoosing a suitable protection board and using it appropriately is crucial to extend the battery lifeCharge Voltage: 19 or 21VSingle Cell Charge Voltage: 3.8 or 4.25VContinuous Discharge Current:8-20AOvercharge Protection Delay:1SNote: This protection board is used to protect the battery from overcharging and over-discharging. It cannot replace the charger. You still need a special charger for lithium batteries when charging! After connecting the wires, it needs to be first before there will be outputColour:GreenMaterial:PCBPackage Contents:1 x Battery Charging Protection BoardOnly 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.