How to Use Zeee 7.4V 4000mAh 50C 2S lipo battery: Examples, Pinouts, and Specs

The Zeee 7.4V 4000mAh 50C 2S LiPo battery is a high-performance lithium polymer battery designed for demanding applications. With a nominal voltage of 7.4V, a capacity of 4000mAh, and a discharge rate of 50C, this battery is ideal for powering remote-controlled (RC) vehicles, drones, and other high-current devices. Its lightweight and compact design make it a popular choice for hobbyists and professionals alike.

• RC cars, trucks, boats, and airplanes
• Drones and quadcopters
• Robotics and DIY electronics projects
• High-performance portable devices requiring a reliable power source

The following table outlines the key technical details of the Zeee 7.4V 4000mAh 50C 2S LiPo battery:

The Zeee 7.4V 4000mAh 50C 2S LiPo battery has two main connectors:

1. Deans T-Plug (or XT60): Used for power delivery to the load.
2. JST-XH Balance Connector: Used for balancing the cells during charging.

1. Connecting the Battery:

   • Use the Deans T-Plug (or XT60) connector to connect the battery to your device or electronic circuit.
   • Ensure the polarity matches the input terminals of your device to avoid damage.
   • For charging, connect the JST-XH balance connector to a compatible LiPo balance charger.

2. Charging the Battery:

   • Use a LiPo balance charger to charge the battery. Set the charger to 2S (7.4V) mode.
   • Recommended charging current is 1C (4A). Do not exceed the maximum charging current of 2C (8A).
   • Always monitor the charging process and avoid overcharging (maximum voltage: 8.4V).

3. Discharging the Battery:

   • Ensure the load does not exceed the maximum continuous discharge current of 200A.
   • Avoid discharging the battery below 3.0V per cell (6.0V total) to prevent damage.

4. Storage:

   • If the battery will not be used for an extended period, store it at a voltage of 3.8V per cell (7.6V total).
   • Store the battery in a cool, dry place away from flammable materials.

• Safety First: Always handle LiPo batteries with care. Avoid puncturing, short-circuiting, or exposing the battery to fire or water.
• Use a Battery Monitor: When using the battery in RC vehicles or drones, consider using a voltage alarm or monitor to prevent over-discharge.
• Inspect Regularly: Check the battery for swelling, damage, or loose connectors before each use.
• Charging Environment: Charge the battery on a non-flammable surface and never leave it unattended during charging.

The Zeee 7.4V 4000mAh 50C 2S LiPo battery can be used to power an Arduino UNO via a voltage regulator or a DC-DC step-down converter. Below is an example circuit and code to power an Arduino UNO with the battery:

1. Connect the battery's Deans T-Plug to a DC-DC step-down converter.
2. Set the output of the converter to 5V.
3. Connect the 5V output of the converter to the Arduino UNO's 5V pin and GND.

// Example code to blink an LED on Arduino UNO
// Ensure the battery is connected to a step-down converter set to 5V

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. Battery Swelling:

   • Cause: Overcharging, over-discharging, or physical damage.
   • Solution: Stop using the battery immediately. Dispose of it safely according to local regulations.

2. Battery Not Charging:

   • Cause: Faulty charger, incorrect settings, or damaged balance connector.
   • Solution: Verify the charger settings (2S mode, 7.4V). Check the balance connector for damage.

3. Device Shuts Down Prematurely:

   • Cause: Battery voltage too low or high current draw.
   • Solution: Ensure the battery is fully charged and the load does not exceed the discharge rating.

4. Overheating During Use:

   • Cause: Excessive current draw or poor ventilation.
   • Solution: Reduce the load or improve airflow around the battery.

Q1: Can I use this battery for a 3S application?
A1: No, this is a 2S battery with a nominal voltage of 7.4V. Using it in a 3S application may damage your device.

Q2: How long will the battery last on a single charge?
A2: Battery life depends on the load. For example, at a 20A load, the battery will last approximately 12 minutes (4000mAh ÷ 20A).

Q3: Can I charge the battery with a standard USB charger?
A3: No, you must use a LiPo balance charger designed for 2S batteries.

Q4: What happens if I over-discharge the battery?
A4: Over-discharging can permanently damage the battery. Use a voltage monitor to prevent this.

By following these guidelines, you can safely and effectively use the Zeee 7.4V 4000mAh 50C 2S LiPo battery in your projects.