4S 20A 18650 Lithium Battery Protection Board


In stock

SKU: 618345
  1. Model: HXYP-4S-BMD1
  2. Small size designed for a four-cell battery pack.
  3. Simple wiring and circuit
  4. Over-charge Protection
  5. Continuous Current: 10A
  6. Max Pick Current: 20A


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Brand: Generic
Category: Battery Protection Board, Batteries and Accessories on Sale
Tags: 4S bms, 4S 20A battery protection

The 4S 14.8V 20A Lithium battery Protection Board comes with over-charge, over-discharge, over-current and short circuit protection, for a variety of various shapes 3.7V lithium-Ion batteries. HXYP-4S-BMD1 is Small size square shape board under which four 18650 cells can be packed suitable for many requirements of high integration, low cost of the occasion, to meet a wide range of performance requirements to ensure that the battery pack is absolutely safe and reliable.

This BMS (Battery Management System) – a battery management system that is designed to monitor the status of batteries, control the battery charge/discharge process, etc.  Four 18650 batteries can be connected simultaneously to the HXYP-4S-BM20  module.

The features of this charge controller are protection against short circuit (short circuit) and protection against over-discharge (overcharge). Also, a feature of the module is to turn off the power supply for the batteries when the maximum capacity of at least one battery is reached. The maximum operating current of this BMS controller is 20 A, and the quiescent current reaches up to 10 μA. The battery charge is switched off when the voltage reaches 4.25 – 4.35 V, and the discharge when the voltage drops to 2.3 – 3.0 V.

If the maximum permissible value of the supply voltage is exceeded, the charge controller activates the “protection” mode. In order to restore the module, it is necessary to re-apply voltage to the input of the BMS board or wait a while until the charge controller automatically disables protection.

4S 14.8V 20A Lithium Battery Protection Board Connection Diagram
BMS solder instruction:

B+ connected battery positive;
B1 the connect point between battery 1 and battery 2;
B2 connect the point between battery2 and battery 3;
B3 Connect the point between battery 3 and battery 4;
B- connect to battery negative end;
P- + connection charge / discharge positive;
P- connection charge / discharge negative;


  1. Small size designed for a four-cell battery pack.
  2. Simple wiring and circuit
  3. Over-charge Protection

Package Includes:

1 x 4S 20A 18650 Lithium Battery Protection Board



Voltage range


Max working current


Max Peak current


Working Temperature


Storage Temperature




Small current


Life cycle

Around 50000hours

Length (mm):


Width (mm):


Weight (g):


Shipping Weight 0.01 kg
Shipping Dimensions 5 × 5 × 2 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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4S 20A 18650 Lithium Battery Protection Board

What is Battery Management System? – BMS Building Blocks, Working & Functions

A Battery Management System AKA BMS ensures the safety of the battery pack by continuously monitoring and regulating parameters like temperature & voltage.

Questions and answers of the customers

  1. 0 votes
    Q Can this board be used as a charger?
    Asked by wildweasel9 on January 8, 2021 1:48 pm
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Country Of Origin: China