How to Use Battery Charging Module 2 x 18650 USB 5V: Examples, Pinouts, and Specs

The Battery Charging Module 2 x 18650 USB 5V (Manufacturer Part ID: 1567) is a compact and efficient module designed to charge two 18650 lithium-ion batteries simultaneously. It features a USB input for charging and provides a regulated 5V output, making it ideal for powering small electronic devices or circuits. This module is widely used in portable power banks, DIY electronics projects, and backup power systems.

• Portable power banks
• DIY electronics and prototyping
• Backup power supplies for microcontrollers
• Emergency lighting systems
• Small IoT devices

Below are the key technical details of the module:

The module has several key connectors and pins for input, output, and battery connections. Below is a detailed description:

1. Connect the Batteries:

   • Insert two 18650 lithium-ion batteries into the module, ensuring correct polarity. The positive terminal of the battery should connect to the B+ pin, and the negative terminal to the B- pin.
   • Ensure the batteries are securely placed in the holder or connected via wires.

2. Power the Module:

   • Use a standard 5V USB power source (e.g., a phone charger or USB port) to charge the batteries via the micro-USB port.

3. Output Power:

   • To power an external device or circuit, connect the load to the USB Type-A port or use the OUT+ and OUT- pins for direct connections.

4. Monitor Charging:

   • The module typically includes indicator LEDs:
     • Red LED: Charging in progress.
     • Blue LED: Charging complete.

• Battery Safety: Only use high-quality 18650 lithium-ion batteries with built-in protection circuits to avoid risks of overcharging or overheating.
• Heat Management: Ensure proper ventilation around the module during operation to prevent overheating.
• Load Current: Do not exceed the maximum output current of 1A to avoid damaging the module.
• Polarity Check: Double-check the polarity of the batteries before connecting them to the module to prevent damage.

The module can be used to power an Arduino UNO via its USB Type-A port. Below is an example code to blink an LED using the Arduino UNO powered by the module:

// Example code to blink an LED using Arduino UNO
// Ensure the Arduino is powered via the USB Type-A port of the module

const int ledPin = 13; // Pin connected to the onboard LED

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);               // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn the LED off
  delay(1000);               // Wait for 1 second
}

1. Module Not Charging the Batteries:

   • Cause: Incorrect battery polarity or damaged batteries.
   • Solution: Verify the battery polarity and ensure the batteries are functional.

2. No Output Voltage:

   • Cause: Batteries are not charged or the load exceeds the maximum current rating.
   • Solution: Charge the batteries fully and ensure the load current is within the 1A limit.

3. Overheating During Operation:

   • Cause: Prolonged high current draw or poor ventilation.
   • Solution: Reduce the load current and ensure proper airflow around the module.

4. LED Indicators Not Working:

   • Cause: Faulty LEDs or improper connections.
   • Solution: Check the connections and replace the module if necessary.

• Can I use only one 18650 battery with this module?

  • Yes, the module can operate with a single 18650 battery, but the runtime will be reduced.

• Is it safe to leave the module connected to a USB charger indefinitely?

  • Yes, the module includes overcharge protection, but it is recommended to disconnect once fully charged to prolong battery life.

• Can I use this module to charge other types of batteries?

  • No, this module is specifically designed for 18650 lithium-ion batteries and should not be used with other battery types.

• What happens if I connect a load that exceeds 1A?

  • The module may overheat or shut down to protect itself. Always ensure the load current is within the specified limit.