Compact lithium battery charging and protection board with 5V input and 3A overcurrent safety

This integrated circuit board combines a lithium battery charging circuit with essential protection features in a single 2.6cm by 1.7cm module. Designed for DIY electronics enthusiasts and makers, it accepts a standard 5V input—commonly available from USB ports—and provides regulated charging up to a maximum current of 1000mA. The board automatically stops charging when the battery voltage reaches 4.2V with a ±1% tolerance, following standard lithium battery charging protocols to help prolong cell lifespan. Built-in safety mechanisms activate at 2.5V for over-discharge protection and 3A for overcurrent protection, offering basic safeguards for your battery-powered projects.

Features and Construction

This board integrates several functions typically requiring separate components, providing a ready-made solution for lithium battery management. The design prioritises compactness while delivering the core electrical parameters needed for safe charging and operation.

Material and Build

The board uses standard FR-4 printed circuit board material, which provides electrical insulation and mechanical support for the surface-mounted components. The blue solder mask colour helps with visual inspection of solder joints and component placement. All electrical specifications—including the 5V input requirement, 4.2V charging cut-off, 1000mA maximum charging current, 2.5V over-discharge threshold, and 3A overcurrent limit—are implemented through the integrated circuit and supporting components mounted directly on this PCB substrate.

Size and Practical Fit

With dimensions of 2.6cm by 1.7cm, the board occupies minimal space in project enclosures or prototypes. This compact size makes it suitable for portable devices, small robotics projects, or anywhere space constraints exist. The board can be mounted using standard PCB standoffs or adhesive pads, and its small footprint allows for flexible positioning within a device layout.

Uses and Placement

The board serves as a power management module in various electronic applications where lithium batteries require both charging capability and basic protection. Its standard electrical interfaces make it compatible with common components and power sources.

Event or Professional Use

For electronics workshops, educational settings, or prototyping environments, this board provides a ready-made solution that eliminates the need to design charging and protection circuits from scratch. Makers can incorporate it into demonstration projects, proof-of-concept models, or temporary installations where reliable lithium battery management is needed without extensive development time. The specified protection thresholds offer a baseline safety standard for supervised use.

Everyday Home Use

DIY enthusiasts can integrate this board into custom power banks, portable lighting, small audio projects, or hobbyist electronics that use single-cell lithium batteries. The 5V USB input compatibility means it can be charged from common phone chargers, computer ports, or power bank outputs. Home projects benefit from the integrated protection features, which provide basic safeguards against common battery issues like excessive discharge or short circuits.

Benefits and Buying Value

This integrated board offers convenience and basic safety features in a single purchasable module, saving time and reducing complexity compared to sourcing individual components.

Reuse and Low Maintenance

The board is designed as a durable module that can be reused across multiple projects or prototypes. Once properly connected, it requires no ongoing maintenance or calibration—the integrated circuit handles all charging and protection functions automatically. This reusability adds value for makers who frequently work with lithium batteries in different configurations or projects.

Why Choose This Product

This board provides specific, measurable electrical specifications—5V input, 4.2V cut-off, 1000mA charging, 3A protection—that match common lithium battery requirements. The integration of charging and protection eliminates the need to purchase and connect separate modules, saving both space and assembly time. For projects where these exact specifications are suitable, it represents a straightforward, no-fuss solution that performs exactly as stated without unexpected features or complexities.