Durable Infrared Range Sensor 4S 40A 18V 16.8V Lipo Cell Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board with Balance for Drill Motor High Efficiency Module Accessories Accessories

With protection function: Charging overcharge protection, over-discharge protection, overcurrent protection.
If you have any quality problems, please feel free to contact us and we will provide you with the most satisfactory answer.
Output voltage and current stable, will not harm user devices.
The product has undergone extensive testing and quality assurance.