4S 40A 18650 Balanced BMS with Protection Board

Scope of application: Lithium batteries with nominal voltages of 3.6V and 3.7V (including 18650, 26650, polymer lithium batteries)

Product size: 46*60*3.4mm (balanced version)

Product weight: 10.3g (balanced version)

Charging voltage: 16.8V-18.1V

Continuous discharge current (upper limit): 40A (If the heat dissipation environment is not good, please reduce the load current to use)

Continuous charging current (upper limit): 20A

Balanced version: suitable for electric drills with starting current below 80A and power below 135W.

Note 1: Successful start of the electric drill requires 4 power batteries of 15C-20C, or 8 power batteries of 10C-15C (ordinary 18650 cannot start the electric drill!! !).

Note 2: Wiring 0V, 4.2V, 8.4V, 12.6V, 16.8V strictly according to the diagram, do not intentionally short-circuit.

Note 3: For loads with brushed motors, try to connect a non-polar capacitor in parallel with the positive and negative terminals of the motor (withstand voltage above 25V, capacity 10uF-100uF) to prevent the reverse peak voltage generated by the motor from interfering with the protection board or Break down the MOS tube.

Note 4: When connecting 4 groups of batteries in series, please ensure that the voltage of each group of batteries is the same. If they are not the same, please charge each group of batteries separately and then use them in series. . . During the discharge test, the battery with the faster voltage drop is a bad battery.

Explain for some customers with poor electronic foundation: balanced charging is only an auxiliary function, try not to mix good batteries and bad batteries together! The closer the capacity/internal resistance of the 4 sets of batteries, the better! (3 good batteries + 1 Use effect of poor battery = Use effect of 4 poor batteries).