4S 18650 Li-ion BMS Protection Board 40A Balanced Version 16.8V

4S 18650 Li-ion BMS Protection Board 40A Balanced Version 16.8V

This 4S 40A balanced BMS board is used for 4-cell 18650 lithium-ion battery packs with a full-charge voltage of 16.8V. It provides battery pack protection and balancing support for safer charging and discharging. It is suitable for robotics, power tools, high-power LED systems, DIY backup power, portable equipment, and custom rechargeable battery packs. This board is useful when a higher voltage battery pack is needed compared to 2S or 3S configurations. Package includes the same components as the picture.