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How to Use 4S 2A 18650 Lithium Battery Charger Board USB C: Examples, Pinouts, and Specs

Image of 4S 2A 18650 Lithium Battery Charger Board USB C
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Introduction

The 4S 2A 18650 Lithium Battery Charger Board USB C (Manufacturer: Arduino, Part ID: 4S 2A C-Type) is a compact and efficient charging module designed for charging four 18650 lithium-ion batteries connected in series. It supports a maximum charging current of 2A and features a USB-C input for modern and convenient power delivery. This board is ideal for applications requiring a reliable and safe charging solution for high-capacity battery packs.

Explore Projects Built with 4S 2A 18650 Lithium Battery Charger Board USB C

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Explore Projects Built with 4S 2A 18650 Lithium Battery Charger Board USB C

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Image of Breadboard: A project utilizing 4S 2A 18650 Lithium Battery Charger Board USB C in a practical application
Battery-Powered 18650 Li-ion Charger with USB Output and Adjustable Voltage Regulator
This circuit is a battery management and power supply system that uses three 3.7V batteries connected to a 3S 10A Li-ion 18650 Charger Protection Board Module for balanced charging and protection. The system includes a TP4056 Battery Charging Protection Module for additional charging safety, a Step Up Boost Power Converter to regulate and boost the voltage, and a USB regulator to provide a stable 5V output, controlled by a push switch.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of 4S BMS: A project utilizing 4S 2A 18650 Lithium Battery Charger Board USB C in a practical application
3S 18650 Battery Pack with Protection Board for Safe Charging
This circuit consists of three 18650 batteries connected in series to a 3S 10A Li-ion 18650 Charger Protection Board Module. The protection board manages the charging and discharging of the battery pack, ensuring safe operation by balancing the cells and providing overcharge, over-discharge, and short-circuit protection.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Power Bank: A project utilizing 4S 2A 18650 Lithium Battery Charger Board USB C in a practical application
18650 Li-ion Battery Pack with 4S40A BMS and XL4016 Voltage Regulator for Battery-Powered Applications
This circuit is a battery management and charging system for a 4S Li-ion battery pack. It includes multiple 18650 Li-ion batteries connected to a 4S40A BMS for balancing and protection, a battery indicator for monitoring charge status, and an XL4016 module for voltage regulation. The system is designed to be charged via a 20V input from a charger.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of BatteriLading: A project utilizing 4S 2A 18650 Lithium Battery Charger Board USB C in a practical application
Battery-Powered USB-C PD Trigger with MP1584EN Power Regulation
This circuit is a power management system that uses multiple 18650 Li-ion batteries connected in series to provide a stable power output. The batteries are regulated by MP1584EN power regulator boards, which step down the voltage to a suitable level for the connected USB-C PD trigger board and a power jack. The system ensures a consistent power supply for devices connected to the USB-C port and the power jack.
Cirkit Designer LogoOpen Project in Cirkit Designer

Common Applications and Use Cases

  • Power banks and portable energy storage systems
  • DIY electronics projects requiring a 4S lithium battery pack
  • Robotics and remote-controlled devices
  • Solar energy storage systems
  • Backup power supplies for embedded systems

Technical Specifications

Below are the key technical details of the 4S 2A 18650 Lithium Battery Charger Board USB C:

Parameter Specification
Input Voltage 5V (via USB-C port)
Charging Current Up to 2A
Battery Configuration 4S (four 18650 cells in series)
Battery Voltage Range 14.8V nominal (16.8V fully charged)
Protection Features Overcharge, over-discharge,
short-circuit, and overcurrent
Dimensions 60mm x 25mm x 10mm
Operating Temperature -20°C to 60°C

Pin Configuration and Descriptions

The charger board has the following key connections:

Pin/Port Description
USB-C Port Input power supply (5V) for charging the battery pack.
B+ Positive terminal for the first battery in the series.
B- Negative terminal for the last battery in the series.
B1, B2, B3 Intermediate connections for balancing the cells in the 4S configuration.
P+ Positive output terminal for the connected load.
P- Negative output terminal for the connected load.

Usage Instructions

How to Use the Component in a Circuit

  1. Connect the Batteries:

    • Ensure the 18650 batteries are connected in a 4S configuration (four cells in series).
    • Connect the battery terminals to the corresponding pins on the charger board:
      • B+ to the positive terminal of the first cell.
      • B- to the negative terminal of the last cell.
      • B1, B2, and B3 to the intermediate points between the cells.
  2. Power the Charger:

    • Use a USB-C cable to connect the charger board to a 5V power source, such as a USB wall adapter or power bank.
  3. Monitor Charging:

    • The onboard LEDs indicate the charging status:
      • Red LED: Charging in progress.
      • Green LED: Charging complete.
  4. Connect the Load:

    • Use the P+ and P- terminals to connect the load (e.g., a motor, microcontroller, or other devices).

Important Considerations and Best Practices

  • Battery Safety: Use only high-quality, protected 18650 cells to ensure safety and performance.
  • Heat Management: Ensure adequate ventilation around the charger board to prevent overheating.
  • Input Voltage: Do not exceed the 5V input voltage limit to avoid damaging the board.
  • Polarity: Double-check all connections to ensure correct polarity before powering the board.
  • Balancing: The board includes cell balancing functionality to maintain equal charge levels across all cells.

Example: Using with Arduino UNO

The charger board can be used to power an Arduino UNO via its P+ and P- terminals. Below is an example code to monitor the battery voltage using the Arduino UNO:

// Example code to monitor battery voltage using Arduino UNO
// Connect the P+ terminal to A0 and P- terminal to GND on the Arduino UNO

const int batteryPin = A0; // Analog pin connected to the battery's positive terminal
float voltageDividerRatio = 5.7; // Adjust based on your resistor divider values

void setup() {
  Serial.begin(9600); // Initialize serial communication
  pinMode(batteryPin, INPUT); // Set the battery pin as input
}

void loop() {
  int rawValue = analogRead(batteryPin); // Read the analog value
  float batteryVoltage = (rawValue * 5.0 / 1023.0) * voltageDividerRatio;
  
  // Print the battery voltage to the Serial Monitor
  Serial.print("Battery Voltage: ");
  Serial.print(batteryVoltage);
  Serial.println(" V");
  
  delay(1000); // Wait for 1 second before the next reading
}

Note: Use a voltage divider circuit to step down the battery voltage to a safe range (0-5V) for the Arduino UNO's analog input pins.

Troubleshooting and FAQs

Common Issues and Solutions

  1. The board does not charge the batteries:

    • Ensure the USB-C cable and power source are functioning correctly.
    • Verify that the batteries are connected in the correct 4S configuration.
    • Check for loose or incorrect connections on the B+, B-, B1, B2, and B3 terminals.
  2. The board overheats during operation:

    • Ensure the board is not placed in an enclosed space without ventilation.
    • Verify that the input current does not exceed 2A.
  3. The load does not power on:

    • Check the P+ and P- connections to the load.
    • Ensure the batteries are fully charged and properly connected.
  4. LED indicators are not working:

    • Verify the input power supply and USB-C connection.
    • Inspect the board for any visible damage or loose components.

FAQs

Q1: Can I use this board to charge fewer than four 18650 cells?
A1: No, this board is specifically designed for a 4S configuration. Using fewer cells may result in improper operation or damage.

Q2: Can I use a power source other than USB-C?
A2: The board is optimized for USB-C input. Using other power sources is not recommended and may void the warranty.

Q3: Does the board support fast charging?
A3: The board supports a maximum charging current of 2A, which is sufficient for most applications but not classified as "fast charging."

Q4: Is the board compatible with other lithium battery types?
A4: The board is designed for 18650 lithium-ion cells. Using other battery types may result in improper charging or damage.