Lithium Battery Protection with Balance BMS 40A 4S

Try not to mix good batteries and bad batteries together!

4 strings of 16.8V 40A lithium battery protection board (with recovery function - AUTO Recovery)
Scope of application: lithium batteries with a nominal voltage of 3.6V and 3.7V (including 18650, 26650, and 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)
Continuous charging current (upper limit): 20A


Note 1: Four 15C-20C power batteries, or eight 10C-15C power batteries are required to successfully start the electric drill (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: When there is a load with a brush motor, try to connect a non-polar capacitor (over 25V withstand voltage, capacity 10uF-100uF) in parallel with the positive and negative terminals of the motor 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 sets of batteries in series, please ensure that the voltage of each set of batteries is the same, if not, please fully charge each set of batteries separately and then use them in series. . . During the discharge test, the group of batteries whose voltage drops faster is a poor battery.