The TP4056 Lithium Battery Charger Module is the most popular "go-to" solution for charging single-cell 3.7V batteries. At Electrapac, we recommend this module for makers who want to integrate a safe, USB-rechargeable power source into their portable devices.

Product Overview

This module is an all-in-one charging and protection solution. It uses the TP4056 linear charger IC to safely charge a lithium battery using a Constant Current/Constant Voltage (CC/CV) method. Crucially, this version includes an integrated protection IC (DW01) and a dual MOSFET (8205A) to guard your battery against over-discharge and short circuits—features often missing on basic charger boards.

Key Features for Electrapac Customers

• Dual Input Versatility: Choose between the classic Micro-USB (Type-B) for compatibility with older cables or the modern USB Type-C for faster, sturdier connections.

• Built-in Safety (Protection): While standard chargers only handle the charging process, this module also manages the discharging process. It cuts off the load if the battery voltage drops too low, preventing permanent damage to your Li-ion cells.

• Dual Status LEDs: * Red LED: Currently charging.

  • Blue/Green LED: Charging complete (Standby).

• Adjustable Current: By default, the board charges at 1000mA (1A). By changing the $R_{prog}$ resistor (Pin 2 of the IC), you can lower the current to safely charge smaller batteries (e.g., 100mAh Li-Po cells).

• Breadboard Friendly Inputs: Includes solder pads next to the USB port for direct wiring to a $5\text{V}$ power source or solar panel.

Wiring & Connection Guide

To ensure your Electrapac battery system is wired correctly, follow these four terminal points:

1. B+ (Battery Positive): Connect to the positive terminal of your 18650 or Li-Po cell.

2. B- (Battery Negative): Connect to the negative terminal of your battery.

3. OUT+ (Load Positive): Connect to your project's power input (e.g., your Arduino or LED).

4. OUT- (Load Negative): Connect to your project's ground.

   Important: Never connect your load directly to the battery if you want to use the module's protection features!

Primary Applications

• USB Rechargeable Projects: Converting AA-battery-powered toys or devices to rechargeable 18650 power.

• Portable IoT Devices: Powering ESP32 or LoRa sensors that need to be recharged periodically.

• Emergency Lighting: Building small LED lamps with a built-in charger and battery protection.

• Solar-Powered Gadgets: Using a $5\text{V}$ solar panel as the input to the TP4056 for off-grid charging.

• Battery Testing: Providing a safe charging station for harvested 18650 cells.

Why Shop at Electrapac?

We source our TP4056 Protection Modules with high-quality filter capacitors to ensure the charging curve is smooth and stable. At www.electrapac.com, we provide the components that make Lithium power safe, reliable, and easy to use.