How to Use LI-ION CHARGER WITH PROTECTION: Examples, Pinouts, and Specs

The LI-ION CHARGER WITH PROTECTION (Manufacturer: SOLDERED, Part ID: 333014) is a compact and efficient device designed to safely charge lithium-ion batteries. It incorporates advanced protection mechanisms to prevent overcharging, overheating, and short circuits, ensuring the longevity and safety of the battery. This component is ideal for applications requiring reliable and safe battery charging, such as portable electronics, IoT devices, and DIY projects.

• Charging single-cell lithium-ion (Li-Ion) or lithium-polymer (Li-Po) batteries.
• Battery-powered devices like wearables, remote sensors, and handheld gadgets.
• DIY electronics projects requiring safe and efficient battery management.
• Integration into IoT devices for uninterrupted power supply.

The following table outlines the key technical details of the LI-ION CHARGER WITH PROTECTION:

The LI-ION CHARGER WITH PROTECTION has the following pinout:

1. Power Input: Connect a 5V power source (e.g., USB adapter) to the IN+ and IN- pins. Ensure the input voltage is within the specified range (4.5V to 6V).
2. Battery Connection: Connect the lithium-ion battery to the BAT+ and BAT- pins. Ensure correct polarity to avoid damage.
3. Load Connection: If powering a load while charging, connect the load to the OUT+ and OUT- pins.
4. Charging Status: Observe the onboard LED indicators:
   • Red LED: Battery is charging.
   • Green LED: Battery is fully charged.

• Battery Compatibility: Use only single-cell lithium-ion or lithium-polymer batteries with a nominal voltage of 3.7V.
• Heat Dissipation: Ensure adequate ventilation to prevent overheating during operation.
• Adjusting Charging Current: The default charging current is 1A. To adjust it, replace the onboard current-setting resistor (refer to the manufacturer's datasheet for resistor values).
• Avoid Reverse Polarity: Double-check all connections to prevent reverse polarity, which can damage the component.

The LI-ION CHARGER WITH PROTECTION can be used to power an Arduino UNO via its VIN pin. Below is an example circuit and code to monitor the battery voltage:

1. Connect the OUT+ pin of the charger to the VIN pin of the Arduino UNO.
2. Connect the OUT- pin of the charger to the GND pin of the Arduino UNO.
3. Use a voltage divider circuit to step down the battery voltage for monitoring via an analog pin.

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

// Voltage divider resistor values (in ohms)
const float R1 = 10000.0; // Resistor connected to battery positive
const float R2 = 10000.0; // Resistor connected to ground

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

void loop() {
  int rawValue = analogRead(batteryPin); // Read the analog value
  float voltage = (rawValue / 1023.0) * 5.0; // Convert to voltage (Arduino 5V reference)
  float batteryVoltage = voltage * ((R1 + R2) / R2); // Calculate actual battery voltage

  // 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
}

1. LEDs Not Lighting Up

   • Cause: No power input or incorrect connections.
   • Solution: Verify the input voltage and ensure proper connections to the IN+ and IN- pins.

2. Battery Not Charging

   • Cause: Faulty battery or incorrect polarity.
   • Solution: Check the battery's health and ensure correct polarity when connecting to BAT+ and BAT-.

3. Overheating

   • Cause: Excessive charging current or poor ventilation.
   • Solution: Reduce the charging current by replacing the current-setting resistor. Ensure proper airflow around the component.

4. Load Not Powering

   • Cause: Insufficient battery charge or incorrect load connection.
   • Solution: Ensure the battery is charged and verify the load is connected to OUT+ and OUT-.

Q1: Can I use this charger for multi-cell batteries?
A1: No, this charger is designed for single-cell lithium-ion or lithium-polymer batteries only.

Q2: How do I adjust the charging current?
A2: Replace the onboard current-setting resistor. Refer to the manufacturer's datasheet for the appropriate resistor values.

Q3: Is it safe to leave the battery connected after it is fully charged?
A3: Yes, the charger includes overcharge protection to prevent damage to the battery.

Q4: Can I use this charger with a solar panel?
A4: Yes, as long as the solar panel's output voltage is within the specified input range (4.5V to 6V).