🔋 18650 Lithium Battery Charger Module

📌 What’s this project about?

This project is a compact charger module designed for a single 18650 lithium-ion battery. The board allows safe and convenient charging of lithium batteries using a 5V USB power source.

It is useful for many electronics projects such as:

🔦 Portable electronics

📡 IoT devices

🤖 Robotics projects

🔋 DIY power banks

💡 Battery-powered circuits

💡 Why did I make this project?

I created this module to have a simple and reliable charging solution for 18650 batteries in my DIY electronics projects.

Instead of using large commercial modules, I wanted a small PCB that could easily be integrated into custom devices. Designing this board also helped me practice power electronics and PCB layout for battery circuits.

⚙️ How does it work?

The module uses the popular TP4056 lithium battery charging IC, which is designed specifically for single-cell lithium-ion batteries like the 18650 lithium-ion battery.

🔩 Main Components

TP4056 battery charging IC

USB input connector (5V)

Charging status LEDs

Protection circuit (optional depending on design)

Battery connection pads

🔄 Operation

1️⃣ A 5V power source (USB) is connected to the module.

2️⃣ The TP4056 IC regulates the charging current and safely charges the battery.

3️⃣ The charging process follows the constant current / constant voltage method.

4️⃣ LEDs indicate the charging status:

🔴 Charging

🟢 Fully charged

5️⃣ Once fully charged, the battery is ready to power your electronics project.

⭐ Features

✨ Designed for single 18650 lithium battery

🔌 5V USB charging input

🔋 Stable lithium-ion charging circuit

💡 Charging status LEDs

📏 Compact PCB size for easy integration