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How to Use BATERIA 18650 X2: Examples, Pinouts, and Specs

Image of BATERIA 18650 X2
Cirkit Designer LogoDesign with BATERIA 18650 X2 in Cirkit Designer

Introduction

The BATERIA 18650 X2 is a rechargeable lithium-ion battery pack consisting of two 18650 cells. Known for its high energy density, compact size, and long cycle life, this battery pack is widely used in portable electronics, electric vehicles, power banks, and DIY projects. Its dual-cell configuration provides increased capacity and voltage, making it suitable for applications requiring higher power output.

Common applications include:

  • Powering portable devices such as flashlights, cameras, and handheld tools
  • DIY electronics projects, including Arduino-based systems
  • Energy storage for solar-powered systems
  • Electric vehicles and e-bikes
  • Power banks and uninterruptible power supplies (UPS)

Explore Projects Built with BATERIA 18650 X2

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Battery-Powered Adjustable Voltage Regulator with Li-ion 18650 Batteries and BMS
Image of mini ups: A project utilizing BATERIA 18650 X2 in a practical application
This circuit is a power management system that uses four Li-ion 18650 batteries connected to a 2S 30A BMS for battery management and protection. The system includes step-up and step-down voltage regulators to provide adjustable output voltages, controlled by a rocker switch, and multiple DC jacks for power input and output.
Cirkit Designer LogoOpen Project in Cirkit Designer
18650 Li-ion Battery Pack with 4S40A BMS and XL4016 Voltage Regulator for Battery-Powered Applications
Image of Power Bank: A project utilizing BATERIA 18650 X2 in a practical application
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
Battery-Powered Servo Control System with 2S 30A BMS and TP5100 Charger
Image of servo power supply: A project utilizing BATERIA 18650 X2 in a practical application
This circuit is a battery management and charging system for a 2S lithium-ion battery pack, which powers multiple MG996R servos. The TP5100 module charges the battery pack from a 12V power supply, while the 2S 30A BMS ensures safe operation and distribution of power to the servos.
Cirkit Designer LogoOpen Project in Cirkit Designer
Battery-Powered Lora G2 Node Station with 18650 Li-ion Batteries and Boost Converter
Image of Custom-Lora-G2-Node: A project utilizing BATERIA 18650 X2 in a practical application
This circuit is a portable power supply system that uses multiple 18650 Li-ion batteries to provide a stable 5V output through a boost converter. It includes a fast charging module with a USB-C input for recharging the batteries and a battery indicator for monitoring the battery status. The system powers a Lora G2 Node Station, making it suitable for wireless communication applications.
Cirkit Designer LogoOpen Project in Cirkit Designer

Explore Projects Built with BATERIA 18650 X2

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 mini ups: A project utilizing BATERIA 18650 X2 in a practical application
Battery-Powered Adjustable Voltage Regulator with Li-ion 18650 Batteries and BMS
This circuit is a power management system that uses four Li-ion 18650 batteries connected to a 2S 30A BMS for battery management and protection. The system includes step-up and step-down voltage regulators to provide adjustable output voltages, controlled by a rocker switch, and multiple DC jacks for power input and output.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Power Bank: A project utilizing BATERIA 18650 X2 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 servo power supply: A project utilizing BATERIA 18650 X2 in a practical application
Battery-Powered Servo Control System with 2S 30A BMS and TP5100 Charger
This circuit is a battery management and charging system for a 2S lithium-ion battery pack, which powers multiple MG996R servos. The TP5100 module charges the battery pack from a 12V power supply, while the 2S 30A BMS ensures safe operation and distribution of power to the servos.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Custom-Lora-G2-Node: A project utilizing BATERIA 18650 X2 in a practical application
Battery-Powered Lora G2 Node Station with 18650 Li-ion Batteries and Boost Converter
This circuit is a portable power supply system that uses multiple 18650 Li-ion batteries to provide a stable 5V output through a boost converter. It includes a fast charging module with a USB-C input for recharging the batteries and a battery indicator for monitoring the battery status. The system powers a Lora G2 Node Station, making it suitable for wireless communication applications.
Cirkit Designer LogoOpen Project in Cirkit Designer

Technical Specifications

Below are the key technical details for the BATERIA 18650 X2:

Parameter Specification
Battery Type Lithium-Ion (Li-Ion)
Configuration 2 x 18650 cells
Nominal Voltage 7.4V (3.7V per cell in series)
Capacity Typically 2000–3500mAh per cell
Maximum Discharge Current 10A (varies by cell model)
Charging Voltage 8.4V (fully charged)
Charging Current Standard: 0.5C, Fast: 1C
Protection Circuit Optional (depends on the model)
Dimensions ~36mm x 70mm x 20mm (varies slightly)
Weight ~90g (varies by cell capacity)

Pin Configuration and Descriptions

The BATERIA 18650 X2 typically has two terminals for connection:

Pin Label Description
1 Positive (+) Positive terminal for power output
2 Negative (-) Negative terminal for power output

Note: Some battery packs may include additional pins for a built-in protection circuit (e.g., BMS - Battery Management System). These pins are used for monitoring and balancing the cells.

Usage Instructions

How to Use the BATERIA 18650 X2 in a Circuit

  1. Check the Voltage and Polarity:

    • Ensure the device or circuit is compatible with the battery's nominal voltage (7.4V).
    • Always connect the positive terminal (+) to the positive input of the circuit and the negative terminal (-) to the ground.
  2. Charging the Battery:

    • Use a dedicated lithium-ion battery charger with a constant current/constant voltage (CC/CV) charging profile.
    • Set the charger to 8.4V for a fully charged battery.
    • Avoid overcharging or discharging below 6V to prevent damage.
  3. Connecting to an Arduino UNO:

    • Use a voltage regulator (e.g., LM7805) to step down the 7.4V to 5V for powering the Arduino UNO.
    • Example circuit:
      • Connect the battery's positive terminal to the input of the voltage regulator.
      • Connect the regulator's output to the Arduino's 5V pin.
      • Connect the battery's negative terminal to the Arduino's GND pin.
  4. Safety Precautions:

    • Avoid short-circuiting the terminals.
    • Do not expose the battery to high temperatures or puncture the casing.
    • Use a battery holder or insulated enclosure to prevent accidental damage.

Arduino UNO Example Code

Below is an example of using the BATERIA 18650 X2 to power an Arduino UNO and read the battery voltage using an analog pin:

// Define the analog pin connected to the voltage divider
const int batteryPin = A0;

// Voltage divider resistors (e.g., R1 = 10k, R2 = 10k)
const float R1 = 10000.0; // Resistance of R1 in ohms
const float R2 = 10000.0; // Resistance of R2 in ohms

// Arduino reference voltage
const float referenceVoltage = 5.0;

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int rawValue = analogRead(batteryPin); // Read the analog value
  float voltage = (rawValue / 1023.0) * referenceVoltage; // Convert to voltage
  voltage = voltage * ((R1 + R2) / R2); // Adjust for voltage divider

  Serial.print("Battery Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");

  delay(1000); // Wait 1 second before the next reading
}

Note: Use a voltage divider to scale down the battery voltage to a safe range (0–5V) for the Arduino's analog input.

Important Considerations and Best Practices

  • Always use a protection circuit (BMS) to prevent overcharging, over-discharging, and short circuits.
  • Store the battery in a cool, dry place when not in use.
  • Periodically check the battery's voltage and capacity to ensure optimal performance.

Troubleshooting and FAQs

Common Issues and Solutions

  1. Battery Not Charging:

    • Cause: Faulty charger or damaged battery.
    • Solution: Verify the charger output voltage and current. Replace the battery if it no longer holds a charge.
  2. Battery Drains Quickly:

    • Cause: High self-discharge rate or excessive load.
    • Solution: Check for parasitic loads in the circuit. Replace the battery if it has degraded.
  3. Overheating During Use:

    • Cause: Excessive current draw or short circuit.
    • Solution: Ensure the load does not exceed the battery's maximum discharge current. Use a protection circuit.
  4. Arduino Not Powering On:

    • Cause: Incorrect voltage or connection.
    • Solution: Verify the voltage regulator output and ensure proper wiring.

FAQs

  • Can I connect more than two 18650 cells in series? Yes, but ensure the device or circuit is compatible with the higher voltage. Use a BMS for safety.

  • How do I know when the battery is fully charged? The charger will typically indicate a full charge when the voltage reaches 8.4V and the current drops to a minimal level.

  • Can I use the battery without a protection circuit? It is not recommended, as it increases the risk of overcharging, over-discharging, and short circuits.

  • What is the typical lifespan of the BATERIA 18650 X2? With proper care, the battery can last 300–500 charge cycles before significant capacity loss.

By following this documentation, you can safely and effectively use the BATERIA 18650 X2 in your projects.