Battery Protection Board 4S 20A 14.8V BMS For 18650 Lithium Ion Cells HX-4S-A20

Condition: New
Availability: In Stock
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SKU: 637719009683412680

Rs.340 Rs. 425

A battery management system (BMS) is an electronic regulator that monitors and controls the charging and discharging of rechargeable batteries. Battery BMS protection boards are the brains behind battery packs. 20A 4S BMS manages the output, charging, and discharging and also provides critical safeguards to protect the batteries from damage. 18650 protection circuit Board is a high-accuracy voltage detection circuit. The 20A protection board can be used for lithium-ion Phosphate batteries, Low power inverters, massager battery packs, electronics, LED light backup power supplies, solar street lights battery packs and many other products

Features of 4S 20A BMS Protection PCB Board for 18650 Lithium Li-ion Battery Cell 14.8V:

  • The high-accuracy voltage detection circuit
  • Built-in three-stage over-current detection circuit (over-current 1, over-current 2, or load short circuit)
  • MOS transistor can control the battery charge and discharge
  • low standby current consumption.
  • Small size.
  • Simple wiring.
  • Targeted.
  • Custom installation.

Specifications Of Lithium Battery Protection Board Overcharge Short Circuit Over-Discharge Current Limit Protection:

  1. Over Charge Voltage:4.25-4.35v±0.05v
  2. Over-Discharge Voltage: 2.3-3.0v±0.05v
  3. Max working current:10A
  4. Max Peak Current:20A
  5. Working Temperature:-40---+50
  6. Storage Temperature:-40-- +80
  7. Small current:6uA
  8. Life cycle:50000hours
  9. Resistance:45mΩ
  10. Short cut Protection: Protectable
  11. Size:35*35*3.0mm

Using Attention:

  • Please strictly follow the wiring diagram: 0V (B-), 3.7V (B1), 7.4V (B2), 11.1V (B3), 14.8V (B+), do not intentionally short-circuit!
  • After connecting the wire, it needs to be charged before it has output.
  • In series 4 batteries, please ensure that the voltage of each battery is the same. If it is different, please charge each battery separately and then use it in series. In the discharge test, the rapidly decreasing voltage battery is the poor battery.
  • Don't mix good batteries with bad batteries! The more similar the battery capacity or internal resistance, the better! (The effect of 2 good batteries +2 poor batteries = The effect of 4 poor batteries).


  • The battery protection board cannot be used for lithium iron phosphate battery, hernia lamp, hand electric drill battery pack, electric fish electromechanical battery group, electric bicycle battery pack, children's car battery, 775(4A) above the motor, 1W fisheye LED light.
  • For the discharge products with 3A current and above, the discharge ratio of the battery should be above 3C.
  • Multiplier calculation formula:
    • 1C multiplier battery, 2000mAh capacity is equal to 2AH*1=2A upper limit working current.
    • 3C multiplier battery, 2000mAh capacity is equal to 2AH*3=6A upper limit working current.
  • In use, if the battery is hot, it means that the battery multiplier is not applicable. This situation cannot be used for a long time, and the battery will be damaged quickly.

Package Include:

  • 1x Battery Protection Board 4S 20A BMS For 18650 Lithium-Ion Cells HX-4S-A20

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Khalil - July 07, 2022