2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor

2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor

High Quality; Compact size and lightweight;High-accuracy voltage detection circuit; fine workmanship and durable; stable performance. Multiple Protections: Over-discharge protection, overcurrent protection, overcharge protection; High charge and discharge current LOW STANDBY CURRENT: MOS transistor can control the battery charge and discharge, low standby current consumption. Applications:It is suitable for lithium batteries with nominal voltage of 3.7V and full voltage of 4.2V (including 18650, 26650, polymer lithium batteries, no size limit).Besides, it can use for electric drill with starting current below 80A and power below 135W . If you want to start the drill successfully, it requires 3pcs15C-20C power batteries, or 6pcs10C-15C power batteries (Note: ordinary 18650 battery can not start the drill!! Recommended power battery models: VTC4, VTC4A, VTC5A, VTC6). About connecting cables, we suggest using more than 3 square millimeters copper wire.

Specifications:

Charging voltage:16.8v ~ 18.1v

Over Charge voltage:4.25±0.05v

Over Discharge voltage: 2.5v±0.05v

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

Continuous charge current (upper limit): 20A

Internal resistance: Less than 100mΩ

Applications:

It is suitable for lithium batteries with nominal voltage of 3.7V and full voltage of 4.2V (including 18650, 26650, polymer lithium batteries, no size limit).Besides, it can use for electric drill with starting current below 80A and power below 135W .

Note: 

1.Do not deliberately make it short circuit.Please strictly according to the diagram wiring to avoid possible damage to the chip. (Connect wires refer to the "wiring diagram"(NO.5 picture).

2.When the battery for the first time, do not connect any load or equipment to the output.After connection, it need to charge activation first, then will have the output.

3.Do not mix good batteries with bad ones.

4.The closer the internal resistance of the 4 battery capacities is the better.

5.When using a brush motor type load, try to connect a non-polar capacitor (withstand voltage above 25V, capacity 10uF-100uF) in parallel with the positive and negative terminals of the motor to prevent the reverse spike voltage generated by the motor from interfering with the protection board or breakdown of the MOS tube.

Package inlcudes: 

2x 4S 40A lithium Battery Protection Board