18650 Lithium Battery Charging & Boost Module – 3.7V to 9V/5V Adjustable

Upgrade your electronics projects with this compact, all-in-one 18650 Lithium Battery Charging, Boosting & Discharging Integrated Module. Designed for makers, hobbyists, and electronics enthusiasts, this versatile module handles charging, voltage boosting, and discharging in a single board — perfect for multimeter modifications, DIY power banks, and custom battery-powered devices.

Key Features

Integrated 3-in-1 Design: Combines charging, boost conversion, and discharge protection in one compact module — no need for separate components.
Wide Voltage Output: Boosts from a standard 3.7V 18650 lithium cell up to selectable 5V or 9V output — ideal for USB-powered devices and multimeter modifications.
Adjustable Output: Fine-tune the output voltage to suit your specific project requirements with ease.
Max 2A Output Current: Handles up to 2A of output current, making it suitable for a wide range of low-to-medium power electronics.
Compact & Lightweight: Small form factor fits neatly inside custom enclosures, multimeter cases, or DIY builds.
Built-in Protection: Overcharge, over-discharge, and short-circuit protection help keep your battery and circuit safe during operation.
Plug-and-Play Ready: Standard connection pads make wiring straightforward — great for both beginners and experienced builders.

Specifications

Input Voltage: 3.7V (18650 Li-ion cell)
Output Voltage: 5V / 9V (adjustable)
Max Output Current: 2A
Function: Charging + Boost + Discharging (integrated)
Compatible Battery: 18650 Lithium-ion

What Can You Use It For?

Multimeter modification to add rechargeable lithium battery support
DIY portable power supplies
Custom USB charging banks
Robotics and electronics prototyping
Any project requiring a regulated 5V or 9V supply from a single 18650 cell

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What does this 18650 lithium battery module do?

A: This integrated module performs three functions in one board: it charges an 18650 lithium-ion battery, boosts the output voltage from 3.7V up to 5V or 9V, and manages the discharge cycle — all with built-in protection circuitry. It is ideal for powering small electronics and modifying devices like multimeters to run on rechargeable lithium cells.

Q: Is this module compatible with standard 18650 batteries?

A: Yes. This module is specifically designed to work with standard 3.7V 18650 lithium-ion rechargeable cells. Simply connect your 18650 battery to the input pads, and the module handles the rest — charging, boosting, and regulated output.

Q: Can I adjust the output voltage between 5V and 9V?

A: Yes. The module features an adjustable output so you can select or fine-tune between 5V and 9V depending on your project's needs. This makes it highly versatile for a wide range of DIY electronics applications.

Q: What is the maximum current this module can supply?

A: The module supports a maximum output current of 2A, which is sufficient for powering small microcontrollers, sensors, multimeters, and other low-to-medium power electronic devices.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.