TheBMS is for 5 series Li-ion batteries, mainly used for electric toolsIt uses special IC for 5S lithium batteries as processor to detect real-time voltage, charge and discharge current and ambient temperature of each batteryStable various protective functions for charging and discharging, such as overcharge protection over-discharge protection and short circuit protection.Low consumption,the working current is about 25uA and quiescent current is about 6uA.Choosing the correct protection board and applying it appropriately is vital to the longevity your batteriesCharge Voltage: 21V Single Cell Charge Voltage 4.25VCurrent Continuous Discharge Current 8-20AOvercharge Protection Overcharge Single Cell Detection Voltage 4.25Vsize: 65 x 60mmMaterial: PC+Metalcolour: As shownPackage Contents:5 x protection board(Due to different batches, the appearance of the product may be different, but the function is the same)Only the above package content, other products are not included.Note: Light 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.