How to Use lifepo4 battery: Examples, Pinouts, and Specs

The LiFePO4 Battery (Manufacturer: Amptron, Part ID: LiFePO4 Battery) is a rechargeable lithium iron phosphate battery known for its exceptional thermal stability, long cycle life, and safety. Unlike traditional lithium-ion batteries, LiFePO4 batteries offer enhanced durability and are less prone to thermal runaway, making them ideal for demanding applications.

• Electric Vehicles (EVs): Provides reliable power with high discharge currents.
• Solar Energy Storage: Stores energy efficiently for off-grid and backup systems.
• Portable Electronics: Powers devices requiring long-lasting and stable energy.
• Marine and RV Systems: Supplies energy for onboard electronics and appliances.
• Uninterruptible Power Supplies (UPS): Ensures consistent power delivery during outages.

Below are the key technical details for the Amptron LiFePO4 Battery:

LiFePO4 batteries typically have two main terminals for connection:

Some models may include additional terminals for communication or monitoring (e.g., Battery Management System (BMS) connections).

1. Connecting the Battery:

   • Identify the positive (+) and negative (-) terminals of the battery.
   • Use appropriately rated cables to connect the battery to your load or charger.
   • Ensure the connections are secure to prevent sparking or loose contacts.

2. Charging the Battery:

   • Use a LiFePO4-compatible charger with a maximum charge voltage of 14.6V.
   • Avoid overcharging or using chargers designed for other battery chemistries.
   • Monitor the charging process to ensure the battery does not overheat.

3. Discharging the Battery:

   • Ensure the load does not exceed the maximum continuous current rating (100A).
   • Avoid discharging the battery below the cut-off voltage (10.0V) to prevent damage.

4. Using with an Arduino UNO:

   • LiFePO4 batteries can power Arduino projects directly, as their nominal voltage (12.8V) is within the input voltage range of the Arduino's VIN pin (7-12V recommended, 20V max).
   • Use a voltage regulator or DC-DC converter if precise voltage control is required.

// This code reads the voltage of a LiFePO4 battery using an analog pin.
// Ensure a voltage divider is used if the battery voltage exceeds 5V.

const int batteryPin = A0; // Analog pin connected to the voltage divider
const float voltageDividerRatio = 4.0; // Adjust based on your resistor values
const float referenceVoltage = 5.0; // Arduino's reference voltage (5V for most boards)

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

void loop() {
  int rawValue = analogRead(batteryPin); // Read the analog value
  float batteryVoltage = (rawValue / 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
}

• Battery Management System (BMS): Ensure the battery includes a BMS to protect against overcharging, over-discharging, and short circuits.
• Storage: Store the battery in a cool, dry place at 50% charge for long-term storage.
• Temperature: Avoid exposing the battery to extreme temperatures, as this can degrade performance and lifespan.
• Parallel/Series Connections: Follow the manufacturer's guidelines when connecting multiple batteries in parallel or series to avoid imbalances.

1. Can I use a regular lithium-ion charger for a LiFePO4 battery?

   • No, LiFePO4 batteries require a charger specifically designed for their chemistry to ensure safe and efficient charging.

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

   • The battery is fully charged when the voltage reaches 14.6V and the charger indicates a full charge (e.g., LED indicator).

3. Can I connect multiple LiFePO4 batteries in series or parallel?

   • Yes, but ensure all batteries are of the same capacity and state of charge. Use a BMS designed for series or parallel configurations.

4. What is the expected lifespan of a LiFePO4 battery?

   • LiFePO4 batteries typically last over 2000 cycles at 80% Depth of Discharge (DoD), depending on usage and maintenance.

By following this documentation, users can safely and effectively utilize the Amptron LiFePO4 Battery in various applications.