5V 1A Micro USB 18650 Li-ion Charger Module TP4056

TP4056 Micro USB 5V 1A Single Cell 18650 Li-ion Charging & Protection Module

The TP4056 18650 lithium battery charger module is a compact charging and battery protection solution designed for safely charging single-cell 3.7V / 3.6V Li-ion and LiPo batteries. The board integrates a constant-current / constant-voltage charging controller together with a built-in protection circuit. This means the module not only charges the battery but also actively protects it from over-charging, over-discharging, and excessive current draw.

The module operates from a standard 5V input such as a phone charger, USB adapter, or power bank. Because Micro USB input is widely available in Bangladesh, the module is very convenient for students, hobbyists, and engineers working on electronics projects. At Bigyan Project and many DIY electronics communities in BD, this board is commonly used in robotics, portable electronics, Arduino projects, ESP32 devices, and rechargeable backup power systems.

The TP4056 charging IC controls the charging process using CC/CV charging. First, the battery charges with a constant current (up to 1A). When the battery reaches 4.2V, the charger automatically switches to constant voltage mode and gradually reduces current until the battery is safely full. Meanwhile, the onboard protection IC disconnects the battery if voltage drops too low or if a short circuit occurs. This significantly increases battery lifespan and safety, which is especially important when working with 18650 cells in Bangladesh's hot climate.

Product Specifications

Features

• Integrated charging and protection circuit in one board
• Micro USB powered charging input
• Safe automatic charge cutoff at 4.2V
• Battery over-discharge protection
• Short circuit and over-current protection
• LED charging status indicators
• Supports 18650 and LiPo batteries
• Compact size ideal for embedded electronics

Applications / Use Cases

• DIY electronics projects
• Arduino and ESP32 based systems
• Fire-fighting or obstacle robots
• Rechargeable LED light systems
• Portable speakers
• Power bank and backup battery packs
• IoT devices in Bangladesh
• Solar rechargeable battery storage projects

User Guide / How to Use

• Connect battery positive to B+ and battery negative to B-
• Connect device/load to OUT+ and OUT- terminals
• Provide 5V input using Micro USB charger
• Red LED indicates charging
• Green LED indicates full charge
• Use a charger capable of at least 1A output
• Do not reverse battery polarity

Frequently Asked Questions (FAQs)

• Q: Can it charge two 18650 batteries?
  A: Only if the batteries are connected in parallel and are identical in voltage and capacity.
• Q: Can I power my project while charging?
  A: Yes, using OUT+ and OUT- terminals, but avoid heavy load during charging.
• Q: Is it suitable for power bank circuits?
  A: Yes, it is commonly used as the charging stage of power banks.
• Q: Does it stop charging automatically?
  A: Yes, charging automatically stops when the battery reaches 4.2V.

Challenges and Considerations

• Not suitable for multi-cell battery packs in series
• Requires a stable 5V input source
• High-temperature environments may affect battery life
• Battery polarity must be correct

Compatibility

• 18650 Li-ion batteries
• 3.7V LiPo batteries
• 5V USB adapters
• Solar 5V regulator output
• Arduino and ESP32 modules

Future Enhancement Options

• Add DC boost converter for 5V regulated output
• Combine with battery level indicator module
• Integrate into custom power management board
• Use with solar charging controller

Benefits

• Extends battery lifespan
• Improves project safety
• Simple and beginner-friendly wiring
• Widely available 5V charging source
• Low cost solution for rechargeable systems in BD

Conclusion

The TP4056 charging module is an essential component for anyone building rechargeable electronics. Its integrated protection, simple wiring, and USB charging support make it ideal for students, hobbyists, and developers in Bangladesh. Whether used in robotics, portable devices, or IoT systems from Bigyan Project, it provides a reliable and practical battery charging solution.

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