2S 20A 18650 Lithium Battery Protection Board

(1 customer review)

In stock

SKU: 618338
  1. Over Charge Voltage Range: 4.25-4.35 V + 0.05  V
  2. Over Voltage Range: 2.5-3.0 V + 0.05 V
  3. Max. Operating Current: 13 A
  4. Max. Limiting Current: 20 A
  5. Charging Voltage: 8.4-9 V


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Brand: Generic
Category: Battery Protection Board
Tags: 18650, 2S 20A BMS, 2 cell battery charging, HX-2S-D20

BMS (Battery Management System) – a battery management system that is designed to monitor the status of batteries, control the process of charging/discharging the battery, etc.

Two batteries (18650) can be connected simultaneously to the HX-2S-D20 charge-discharge controller module. The module has protection against short circuit, overcharge and over-discharge. One of the functions of the charge controller is to turn off the power supply for the batteries when the maximum capacity of at least one battery is reached. This BMS controller is designed for more than 30,000 hours of operation. The maximum allowable current is 20 A.

The HX-2S-D20 BMS module has 5 pins:

B+     : Battery positive pole
B-      : Battery negative pole
BM    : Mid-point of a battery assembly
P-      : Negative charge / discharge terminal
P+     :Positive charge/discharge terminal

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.

Power is supplied to the module from an external power source. The voltage range of the module is from 7.4 to 8.4 V. For charging, you can use a step-up voltage converter with a current limiter. Please note that this module is not a charger.


  1. Small size designed for a four-cell battery pack.
  2. Simple and  convenient circuit for easy connections
  3. Over-charge/Over-discharge Protection.

Package Includes:

1 x 2S 20A 18650 Lithium Battery Protection Board



Over Charge Voltage Range

4.25-4.35 V + 0.05 V

Over Voltage Range

2.5-3.0 V + 0.05 V

Max. Operating Current

13 A

Max. Limiting Current

20 A

Charging Voltage

8.4-9 V

Quiescent Current

Lower than 10 µA

Internal Resistance

<300 Ohm

Operating Temperature

-40°C to +50°C

Length (mm):


Width (mm):


Height (mm):


Weight (g):


Shipping Weight 0.005 kg
Shipping Dimensions 4 × 4 × 1 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.

Based on 1 review

5.0 overall

Add a review

  1. Jayachandran (verified owner)

    Works as expected…. Thanks.


2S 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 I use it for 2s 2p configuration? answer now
    Asked by Krishna V on June 14, 2022 10:15 pm

    Yes, you can use it for 2 series 2 parallel

  2. 0 votes


    The pin diagram for the module is... Read more

  3. 0 votes
    There are no answers for this question yet. Answer now
Only registered users are eligible to enter questions
Country Of Origin: China

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