The protection board is for 5 series Li-ion batteries, mainly used for electric power tools.
It uses special IC for 5S lithium batteries as processor to detect real-time voltage, charge and discharge current and ambient temperature of each battery.
Stable various protective functions for charging and discharging, such as overcharge protection, over-discharge protection and short circuit protection.
Low power 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 batteries.

Charge Voltage:19/21V
Single Cell Charge Voltage:3.8/4.25V
Continuous Discharge Current:8-20A
Overcharge Single Cell Detection Voltage:3.85-4.25V
Overcharge Protection Delay:1S
Overcharge Single Cell Recovery Voltage 3.75-4.13V
Overcharge Protection Release Delay:1mS
Over-discharge Single Cell Detection Voltage:2-2.8V
Over-discharge Protection Delay:1S
Over-discharge Single Cell Recovery Voltage:2.5-3.0V
Over-discharge Protection Release Delay:100 +/- 20mS
Over-current Detection Voltage:0.1-0.4V
Over-current Detection Current:30 +/- 5A
Over-current Detection Delay:1S
Recovery State:Auto
Short Circuit Protection:Support Yes
Short Circuit Detection Delay:250uS
Short Circuit Release Delay:1S
Short Circuit Detection Voltage 0.8V
Protection Temperature:70 +/- 5 degree
Recovery Temperature:55 +/- 5 degree
Discharge Main Circuit Internal Resistance:30 +/- 5m ohm
Operating Temperature: -40 degree-85 degree RH less than or equal to 75%
Store Temperature:-40 degree-125 degree RH less than or equal to 75%
Type: double MOS
Colour: green
Material: plastic
Size: 46x40mm/1.81x1.57inch

Package Contents:
4 x Battery Pro