3.7v 2500mah 18650 Li-Ion Battery Documentation

Nominal Voltage

3.7V

Capacity

2500mAh (milliampere-hours)

Chemistry

Type

Lithium-Ion (Li-Ion)

Composition

Lithium Cobalt Oxide (LiCoO2) cathode, Graphite anode, and an organic electrolyte

Physical Characteristics

Size

18650 (18mm diameter, 65mm length)

Weight

approximately 45-50 grams

Terminals

Nickel-plated steel positive terminal and a copper-negative terminal

Electrical Characteristics

Maximum Charge Current

2C (5000mA)

Maximum Discharge Current

2C (5000mA)

Cycle Life

up to 500 charge/discharge cycles

Safety Features

Self-Discharge Rate

less than 3% per month

Overcharge Protection

prevents damage from excessive charging

Over-Discharge Protection	prevents damage from excessive discharging
Short-Circuit Protection	prevents damage from short circuits

Thermal Protection

prevents overheating

Operating Conditions

Operating Temperature

-20C to 45C (-4F to 113F)

Storage Temperature

-20C to 35C (-4F to 95F)

Compliance and Certifications

Compliance with IEC 62133 safety standard for lithium-ion batteries

UN38.3 certification for safe transportation of lithium-ion batteries

Applications

IoT devices (sensors, gateways, etc.)

Portable electronics (smartphones, laptops, etc.)

Electric vehicles and hybrid vehicles

Renewable energy systems (solar, wind, etc.)

Important Notes

Always follow proper charging and discharging procedures to ensure the battery's longevity and safety.

Avoid exposing the battery to extreme temperatures, physical damage, or water.

Recycle the battery responsibly when it reaches the end of its life cycle.

By understanding the features and characteristics of the 3.7V 2500mAh 18650 Li-Ion Battery, users can optimize their designs and ensure safe and efficient operation in their applications.

Pin Configuration

3.7v 2500mah 18650 Li-Ion Battery Documentation
Overview
The 3.7v 2500mah 18650 Li-Ion Battery is a rechargeable lithium-ion battery designed for use in various IoT applications. This battery has a nominal voltage of 3.7V and a capacity of 2500mAh.
Pinout Diagram
The 18650 Li-Ion Battery has two pins:
Pinout Description
Here is a point-by-point explanation of each pin:
Positive Terminal ( Cathode ):
+ Pin Name: None (usually marked with a "+" sign or a red wire)
+ Function: Supplies the positive voltage to the connected device
+ Voltage: 3.7V (nominal)
+ Current: Up to 2500mA (dependent on the device's power requirements)
Negative Terminal ( Anode ):
+ Pin Name: None (usually marked with a "-" sign or a black wire)
+ Function: Supplies the negative voltage (ground) to the connected device
+ Voltage: 0V (ground)
+ Current: Up to 2500mA (dependent on the device's power requirements)
Connecting the Pins
To connect the pins, follow these steps:
1. Identify the Positive Terminal (Cathode): Locate the positive terminal, marked with a "+" sign or a red wire. This terminal supplies the positive voltage to the connected device.
2. Identify the Negative Terminal (Anode): Locate the negative terminal, marked with a "-" sign or a black wire. This terminal supplies the negative voltage (ground) to the connected device.
3. Connect the Positive Terminal: Connect the positive terminal to the positive input of the device, such as a microcontroller or a module.
4. Connect the Negative Terminal: Connect the negative terminal to the negative input (ground) of the device, ensuring a secure and reliable connection.
5. Verify the Connection: Double-check the connections to ensure that the positive terminal is connected to the positive input and the negative terminal is connected to the negative input (ground).
Important Safety Considerations
Handle the battery with care to avoid short circuits, which can cause damage or fire.
Use a suitable charger and follow the manufacturer's charging guidelines to avoid overcharging or undercharging.
Keep the battery away from children and pets.
Avoid puncturing or damaging the battery's internal components, as this can cause a safety hazard.
By following these guidelines and connecting the pins correctly, you can safely and efficiently power your IoT devices using the 3.7v 2500mah 18650 Li-Ion Battery.

Code Examples

3.7v 2500mah 18650 Li-Ion Battery Documentation

Overview

The 3.7v 2500mah 18650 Li-Ion Battery is a rechargeable battery designed for use in Internet of Things (IoT) devices, robotics, and other electronic projects. It offers a high capacity of 2500mAh and a nominal voltage of 3.7V, making it suitable for a wide range of applications.

Specifications

Nominal Voltage: 3.7V
 Capacity: 2500mAh
 Chemistry: Lithium-Ion (Li-Ion)
 Size: 18650 (18mm x 65mm)
 Weight: approximately 45g
 Operating Temperature: -20C to 45C
 Cycle Life: up to 300 cycles

Connecting the Battery

To use the 3.7v 2500mah 18650 Li-Ion Battery, you'll need to connect it to a suitable charging circuit and/or a load device. The battery has a standard 18650 form factor with a positive terminal (cathode) and a negative terminal (anode).

Code Examples

### Example 1: Arduino Battery Monitoring

In this example, we'll use an Arduino board to monitor the battery voltage and capacity. We'll use the Arduino's built-in analog-to-digital converter (ADC) to read the battery voltage and calculate the remaining capacity.

Hardware Requirements

Arduino Board (e.g., Arduino Uno)
 3.7v 2500mah 18650 Li-Ion Battery
 Breadboard and jumper wires
 10k resistor (for voltage division)

Software Code
```c
const int batteryPin = A0;  // Analog input pin for battery voltage
const int resistorValue = 10000;  // 10k resistor value

void setup() {
  Serial.begin(9600);
}

void loop() {
  int batteryVoltage = analogRead(batteryPin);
  float voltageValue = (batteryVoltage  5.0) / 1024.0;
  voltageValue = voltageValue  (resistorValue / (resistorValue + resistorValue));

float batteryCapacity = (voltageValue - 3.0) / 0.1;  // Approximate capacity calculation
  Serial.print("Battery Voltage: ");
  Serial.print(voltageValue);
  Serial.print("V, Capacity: ");
  Serial.print(batteryCapacity);
  Serial.println("%");

delay(1000);
}
```
### Example 2: ESP32 Battery-Powered IoT Device

In this example, we'll use an ESP32 microcontroller to create a battery-powered IoT device that sends data to a cloud service. We'll use the ESP32's built-in Wi-Fi capability and a battery monitoring library to monitor the battery level.

Hardware Requirements

ESP32 Microcontroller
 3.7v 2500mah 18650 Li-Ion Battery
 Breadboard and jumper wires
 Wi-Fi antenna (optional)

Software Code
```c
#include <WiFi.h>
#include <Battery.h>

const char ssid = "your_wifi_ssid";
const char password = "your_wifi_password";

WiFiClient client;

void setup() {
  Serial.begin(115200);

// Initialize Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to Wi-Fi...");
  }

Serial.println("Connected to Wi-Fi");
}

void loop() {
  int batteryLevel = battery.getLevel();
  Serial.print("Battery Level: ");
  Serial.print(batteryLevel);
  Serial.println("%");

// Send data to cloud service
  client.setServer("your_cloud_service_url", 80);
  client.print(String("GET /update?batteryLevel=") + String(batteryLevel) + " HTTP/1.1
");
  client.print("Host: your_cloud_service_url
");
  client.print("Connection: close

");
  client.stop();

delay(30000);  // Send data every 30 seconds
}
```
Important Notes

Always use a suitable charging circuit and follow proper safety precautions when working with lithium-ion batteries.
 The code examples provided are for illustration purposes only and may require modifications to suit your specific project requirements.
 Make sure to consult the datasheet and application notes for the specific battery model you are using, as well as the documentation for any microcontrollers or other components in your project.

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3.7v 2500mah 18650 Li-Ion Battery