The 2S 7.4V LiPo Battery (Manufacturer: HA, Part ID: 2S 7.4) is a 2-cell lithium polymer (LiPo) battery pack that delivers a nominal voltage of 7.4 volts. Known for its high energy density and lightweight design, this battery is widely used in applications requiring compact and efficient power sources. It is particularly popular in remote-controlled (RC) vehicles, drones, robotics, and portable electronic devices.
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This circuit is a battery management and power supply system that uses three 3.7V batteries connected to a 3S 10A Li-ion 18650 Charger Protection Board Module for balanced charging and protection. The system includes a TP4056 Battery Charging Protection Module for additional charging safety, a Step Up Boost Power Converter to regulate and boost the voltage, and a USB regulator to provide a stable 5V output, controlled by a push switch.
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.
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.
This circuit appears to be a power distribution and control system for a vehicle with two motorized wheels, possibly a drone or a robot. It includes a lipo battery connected to a Power Distribution Board (PDB) that distributes power to two Electronic Speed Controllers (ESCs) which in turn control the speed and direction of the motors. The system also integrates a flight controller (H743-SLIM V3) for managing various peripherals including GPS, FPV camera system, and a telemetry link (ExpressLRS).
The following table outlines the key technical specifications of the 2S 7.4V LiPo Battery:
Parameter
Specification
Nominal Voltage
7.4V (2 cells in series)
Cell Configuration
2S (2 cells in series)
Capacity
Varies (e.g., 1000mAh, 2200mAh, etc.)
Maximum Discharge Rate
Typically 20C to 50C (varies by model)
Charging Voltage
8.4V (maximum)
Recommended Charge Rate
1C (e.g., 2.2A for a 2200mAh battery)
Connector Type
XT60, JST, or other (varies by model)
Balancing Connector
JST-XH (standard for 2S LiPo packs)
Weight
Varies (e.g., ~100g for 2200mAh)
Dimensions
Varies (e.g., ~100mm x 35mm x 20mm)
Pin Configuration
The 2S 7.4V LiPo Battery typically includes two connectors:
Main Power Connector: Supplies power to the load.
Balance Connector: Used for charging and balancing the cells.
Balance Connector Pinout (JST-XH for 2S LiPo)
Pin Number
Function
Description
1
Cell 1 Negative
Negative terminal of the first cell
2
Cell 1 Positive
Positive terminal of the first cell
3
Cell 2 Positive
Positive terminal of the second cell
Usage Instructions
How to Use the 2S 7.4V LiPo Battery in a Circuit
Connect the Main Power Connector: Attach the main power connector (e.g., XT60 or JST) to the input of your circuit or electronic device.
Use a Compatible Charger: Always use a LiPo-compatible charger with a balance charging feature to ensure safe and efficient charging.
Monitor Voltage Levels: Avoid discharging the battery below 3.0V per cell (6.0V total for a 2S pack) to prevent damage.
Balance Charge Regularly: Use the balance connector to ensure both cells are charged evenly, which extends battery life and maintains performance.
Important Considerations and Best Practices
Charging Safety: Never charge the battery unattended. Use a fireproof LiPo charging bag for added safety.
Storage: Store the battery at a voltage of 3.7V to 3.85V per cell (7.4V to 7.7V total) when not in use for extended periods.
Temperature: Avoid exposing the battery to extreme temperatures (below 0°C or above 60°C).
Inspect Regularly: Check for physical damage, swelling, or puffing before each use. Do not use a damaged battery.
Discharge Rate: Ensure the load does not exceed the battery's maximum discharge rate (e.g., 20C to 50C).
Example: Using the Battery with an Arduino UNO
The 2S 7.4V LiPo Battery can power an Arduino UNO through its VIN pin. Below is an example circuit and code:
Circuit Connection
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 of the Arduino UNO.
Optionally, use a voltage regulator if your circuit requires a stable 5V output.
Sample Code
// Example code to read an analog sensor and print the value to the Serial Monitor
// Ensure the battery voltage is within the Arduino's operating range (7-12V).
const int sensorPin = A0; // Analog pin connected to the sensor
int sensorValue = 0; // Variable to store the sensor reading
void setup() {
Serial.begin(9600); // Initialize serial communication at 9600 baud
}
void loop() {
sensorValue = analogRead(sensorPin); // Read the sensor value
Serial.print("Sensor Value: ");
Serial.println(sensorValue); // Print the sensor value to the Serial Monitor
delay(1000); // Wait for 1 second before the next reading
}
Troubleshooting and FAQs
Common Issues and Solutions
Battery Not Charging
Cause: Charger not set to LiPo mode or incorrect settings.
Solution: Verify the charger is set to LiPo mode and the correct cell count (2S).
Battery Swelling or Puffing
Cause: Overcharging, over-discharging, or physical damage.
Solution: Stop using the battery immediately. Dispose of it safely according to local regulations.
Device Not Powering On
Cause: Low battery voltage or loose connections.
Solution: Check the battery voltage with a multimeter and ensure all connections are secure.
Uneven Cell Voltages
Cause: Cells are out of balance due to improper charging.
Solution: Use a balance charger to equalize the cell voltages.
FAQs
Q: Can I use the 2S 7.4V LiPo Battery with a 5V device?
A: Yes, but you will need a voltage regulator to step down the voltage to 5V.
Q: How do I know when the battery is fully charged?
A: A fully charged 2S LiPo battery will have a voltage of 8.4V (4.2V per cell).
Q: What happens if I over-discharge the battery?
A: Over-discharging can permanently damage the battery and reduce its capacity. Always use a low-voltage alarm or cutoff circuit to prevent this.
Q: Can I charge the battery without a balance charger?
A: It is not recommended. A balance charger ensures both cells are charged evenly, which is critical for safety and performance.
By following these guidelines, you can safely and effectively use the 2S 7.4V LiPo Battery in your projects.
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