4S 40A Li- Lithium Battery Charger Protection Board 18650 BMS for Drill Motor 11.1V 12.6V/14.8V 16.8V Balance Board

Whether external supply is required: no external supply is required and the internal energy transfer of the battery is used to transfer and the entire set batteries in balance. Colour: as shown Material: PCB Package Contents: 4 * Protection Board Only the above package content other products are not included. Note: Light and different displays may the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.