The 18650 Lithium Battery Charger Module is a compact, multi-functional power bank module designed for DIY portable chargers, emergency power supplies, and battery-powered projects. It combines a single-cell 18650 lithium battery charging circuit, a 5V boost converter, and dual USB output ports in one integrated board, with an onboard digital display showing battery voltage and charge status.
At the heart of the module is a TP4056-style charging circuit that safely charges a single 18650 lithium-ion cell from a 5V USB input. The charging process follows the standard constant-current/constant-voltage (CC/CV) profile, with the charging current configurable via an onboard resistor (typically set to 1A). The board includes overcharge protection (4.2V cutoff) and over-discharge protection to extend battery lifespan.
The boost converter steps up the 3.7V battery voltage to a regulated 5V output, capable of delivering up to 2.4A total across the dual USB ports. This provides ample power for fast-charging smartphones, tablets, and other USB-powered devices. The high-efficiency boost circuit (up to 92%) minimizes power loss and heat generation.
The dual USB ports (Type-A) allow simultaneous charging of two devices, making it convenient for travel, camping, and emergency use. The digital display shows real-time battery voltage and charge percentage, so you always know how much power remains.
The module includes comprehensive protection circuits:
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Overcharge protection — Prevents battery damage from excessive charging
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Over-discharge protection — Prevents deep discharge that can damage the battery
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Overcurrent protection — Protects against short circuits and excessive loads
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Over-temperature protection — Ensures safe operation under heavy load
The board features solder pads for connecting the 18650 battery holder, and USB ports for input charging and output power. The compact PCB design with mounting holes makes it easy to integrate into custom power bank enclosures, portable chargers, and DIY projects.
The module is widely used in DIY power banks, portable chargers, emergency power supplies, camping gear, solar power storage, and battery-powered projects. It is also popular in educational projects for teaching battery charging, boost conversion, and power management principles.
Important Note: This module is designed for single-cell 18650 lithium batteries (3.7V nominal). Always use a genuine, high-quality 18650 cell with adequate capacity (2000mAh–3500mAh recommended) for best performance. Ensure proper polarity when connecting the battery. Never short-circuit the battery terminals.
Whether you are building a custom power bank, assembling an emergency charger, or adding portable power to a project, the 18650 Lithium Battery Charger Module provides a reliable, integrated solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.
Features
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Single-cell 18650 charging — Safe CC/CV charging with 4.2V cutoff
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5V boost converter — Steps up 3.7V battery to regulated 5V output
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Dual USB output ports — Charge two devices simultaneously
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2.4A total output — Fast charging for smartphones and tablets
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Digital display — Shows battery voltage and charge percentage
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High efficiency — Up to 92% boost conversion efficiency
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Comprehensive protection — Overcharge, over-discharge, overcurrent, over-temperature
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Compact PCB design — With mounting holes for easy integration
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Wide application range — DIY power banks, portable chargers, emergency power
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Battery | 1S 18650 lithium-ion (3.7V) |
| 2 | Charging Input | 5V DC via USB |
| 3 | Charging Current | Up to 1A (configurable) |
| 4 | Output Voltage | 5V DC (regulated) |
| 5 | Total Output Current | 2.4A maximum (dual USB) |
| 6 | Boost Efficiency | Up to 92% |
| 7 | Protection | Overcharge, over-discharge, overcurrent, over-temperature |
| 8 | Display | Digital voltage/charge indicator |
