The TP4056 Charger Module is a compact, cost-effective lithium-ion battery charging solution widely used in IoT devices, robotics, and embedded research projects. It is specifically designed to charge single-cell Li-ion/Li-Polymer 3.7V batteries (such as 18650 cells) with constant current–constant voltage (CC/CV) charging profile, ensuring safe and efficient battery management.

This module often comes in two variants:

• Without protection → Basic charging control.

• With protection → Includes overcharge, over-discharge, and short-circuit protection (using DW01A + MOSFET).

Key specifications:

• Input Voltage: 4.5V – 5.5V (typically powered via Micro-USB or solder pads)

• Charging Current: 1A (default, set by onboard resistor)

• Battery Voltage: 3.7V nominal (charges up to 4.2V ±1%)

• Charge Algorithm: CC/CV (constant current, constant voltage)

• Status Indicators: 2 LEDs → Charging (red), Fully Charged (blue/green)

• Protection Features (on protected variant):

  • Overcharge protection (~4.28V cutoff)

  • Over-discharge protection (~2.5V cutoff)

  • Overcurrent/short-circuit protection

• Efficiency: ~90% (depends on input supply and cell condition)

• Operating Temperature: -10°C to +85°C

Research & application relevance:

• IoT Prototypes: Perfect for battery-powered ESP32, NodeMCU, and Arduino modules.

• Robotics & Wearables: Enables safe charging of Li-ion packs in portable systems.

• Embedded Power Research: Provides hands-on exploration of charging algorithms, battery management, and energy storage systems.

• DIY Power Banks & UPS: Often used in small-scale power storage projects with 18650 cells.

The TP4056 is highly valued in research because of its simplicity, safety features, and modular integration for powering and charging portable embedded systems.