The 4S 2A 18650 Lithium Battery Charger Board USB C (Manufacturer: Arduino, Part ID: 4S 2A C-Type) is a compact and efficient charging module designed for charging four 18650 lithium-ion batteries connected in series. It supports a maximum charging current of 2A and features a USB-C input for modern and convenient power delivery. This board is ideal for applications requiring a reliable and safe charging solution for high-capacity battery packs.
Below are the key technical details of the 4S 2A 18650 Lithium Battery Charger Board USB C:
Parameter | Specification |
---|---|
Input Voltage | 5V (via USB-C port) |
Charging Current | Up to 2A |
Battery Configuration | 4S (four 18650 cells in series) |
Battery Voltage Range | 14.8V nominal (16.8V fully charged) |
Protection Features | Overcharge, over-discharge, |
short-circuit, and overcurrent | |
Dimensions | 60mm x 25mm x 10mm |
Operating Temperature | -20°C to 60°C |
The charger board has the following key connections:
Pin/Port | Description |
---|---|
USB-C Port | Input power supply (5V) for charging the battery pack. |
B+ | Positive terminal for the first battery in the series. |
B- | Negative terminal for the last battery in the series. |
B1, B2, B3 | Intermediate connections for balancing the cells in the 4S configuration. |
P+ | Positive output terminal for the connected load. |
P- | Negative output terminal for the connected load. |
Connect the Batteries:
Power the Charger:
Monitor Charging:
Connect the Load:
The charger board can be used to power an Arduino UNO via its P+ and P- terminals. Below is an example code to monitor the battery voltage using the Arduino UNO:
// Example code to monitor battery voltage using Arduino UNO
// Connect the P+ terminal to A0 and P- terminal to GND on the Arduino UNO
const int batteryPin = A0; // Analog pin connected to the battery's positive terminal
float voltageDividerRatio = 5.7; // Adjust based on your resistor divider values
void setup() {
Serial.begin(9600); // Initialize serial communication
pinMode(batteryPin, INPUT); // Set the battery pin as input
}
void loop() {
int rawValue = analogRead(batteryPin); // Read the analog value
float batteryVoltage = (rawValue * 5.0 / 1023.0) * 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 step down the battery voltage to a safe range (0-5V) for the Arduino UNO's analog input pins.
The board does not charge the batteries:
The board overheats during operation:
The load does not power on:
LED indicators are not working:
Q1: Can I use this board to charge fewer than four 18650 cells?
A1: No, this board is specifically designed for a 4S configuration. Using fewer cells may result in improper operation or damage.
Q2: Can I use a power source other than USB-C?
A2: The board is optimized for USB-C input. Using other power sources is not recommended and may void the warranty.
Q3: Does the board support fast charging?
A3: The board supports a maximum charging current of 2A, which is sufficient for most applications but not classified as "fast charging."
Q4: Is the board compatible with other lithium battery types?
A4: The board is designed for 18650 lithium-ion cells. Using other battery types may result in improper charging or damage.