How to Use batterie au lithium avec jst PH: Examples, Pinouts, and Specs

A lithium battery with a JST PH connector is a compact, lightweight, and high-energy-density power source commonly used in small electronic devices. The JST PH connector provides a secure and reliable connection, making it ideal for portable applications. These batteries are rechargeable and are widely used in robotics, IoT devices, handheld gadgets, and prototyping projects.

• Powering microcontroller-based projects (e.g., Arduino, Raspberry Pi)
• Wearable electronics
• Remote-controlled devices (e.g., drones, cars)
• Portable sensors and IoT devices
• Backup power for small systems

Below are the general specifications for a typical lithium battery with a JST PH connector. Note that specific values may vary depending on the manufacturer and model.

The JST PH connector is a 2-pin connector with the following pinout:

1. Connecting the Battery:

   • Ensure the device or circuit is compatible with the battery's voltage and current ratings.
   • Plug the JST PH connector into the corresponding socket on your device or circuit.
   • Verify the polarity of the connector to avoid reverse polarity damage.

2. Charging the Battery:

   • Use a dedicated lithium battery charger with a constant current/constant voltage (CC/CV) charging profile.
   • Set the charging voltage to 4.2V and ensure the charging current does not exceed the battery's maximum rating (e.g., 1C).

3. Discharging the Battery:

   • Avoid discharging the battery below its cutoff voltage (3.0V) to prevent damage.
   • Use a battery protection circuit or a voltage monitoring system to ensure safe operation.

4. Connecting to an Arduino UNO:

   • Use a voltage regulator (e.g., LM7805 or a buck converter) if the battery voltage exceeds 5V.
   • Connect the positive terminal of the battery to the VIN pin of the Arduino UNO.
   • Connect the negative terminal of the battery to the GND pin.

The following code demonstrates how to monitor the battery voltage using an analog input pin on the Arduino UNO.

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

// Define the voltage divider ratio (adjust based on your resistor values)
const float voltageDividerRatio = 2.0;

// Reference voltage of the Arduino (5V for most boards)
const float referenceVoltage = 5.0;

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

void loop() {
  // Read the analog value from the battery pin
  int analogValue = analogRead(batteryPin);

  // Convert the analog value to a voltage
  float batteryVoltage = (analogValue / 1023.0) * referenceVoltage * 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 scale down the battery voltage to a safe range (0-5V) for the Arduino's analog input. For example, use two resistors in series (e.g., 10kΩ and 10kΩ) to divide the voltage by half.

• Polarity: Always check the polarity of the JST PH connector before connecting the battery to avoid damage.
• Overcharging/Overdischarging: Use a battery management system (BMS) or protection circuit to prevent overcharging or overdischarging.
• Storage: Store the battery in a cool, dry place at around 50% charge for long-term storage.
• Handling: Avoid puncturing, short-circuiting, or exposing the battery to high temperatures.

1. Can I use this battery to power a 5V device?

   • Yes, but you will need a boost converter to step up the voltage from 3.7V to 5V.

2. How do I know when the battery is fully charged?

   • A lithium battery is fully charged when the voltage reaches 4.2V and the charging current drops to a minimal level.

3. Can I connect multiple batteries in series or parallel?

   • Yes, but ensure you use a proper battery management system (BMS) to balance the cells and protect them from overcharging or overdischarging.

4. Is it safe to leave the battery connected to the charger?

   • No, it is not recommended to leave the battery connected to the charger for extended periods after it is fully charged.

By following this documentation, you can safely and effectively use a lithium battery with a JST PH connector in your projects.