Lithium battery charging and protection integrated board module with 5V input, 4.2V ±1% charging cut-off, 2.5V over-discharge protection and 3A overcurrent protection, 1000mA maximum charging current, blue PCB board measuring 26 x 17 mm.

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£5.58

Lithium battery charging and protection integrated board module with 5V input, 4.2V ±1% charging cut-off, 2.5V over-discharge protection and 3A overcurrent protection, 1000mA maximum charging current, blue PCB board measuring 26 x 17 mm.

£5.58

5V Input Lithium Battery Charger and Protection Board with 4.2V Cut-off and 3A Current Protection

This integrated circuit board provides a complete power management solution for projects using single-cell lithium-ion (Li-ion) or lithium-polymer (LiPo) batteries. By combining a battery charger with essential protection features on a compact 26 x 17 mm printed circuit board (PCB), it simplifies the design and enhances the safety of portable electronics, DIY builds, and battery backup systems. The module requires only a 5V input—compatible with common USB ports or power adapters—to safely charge your battery while guarding against conditions that can shorten its lifespan or pose a risk.

Technical Specifications and Charging Profile

The board is engineered for 3.7V nominal lithium cells, adhering to standard charging parameters for this chemistry. Its operation is defined by several key electrical specifications that determine its performance and safety limits.

Input Voltage and Charging Current

The module is designed to operate from a 5V DC input, a voltage widely available from USB ports, phone chargers, and many regulated power supplies. This input powers the onboard charging circuitry, which can deliver a maximum current of 1000mA (1 Amp) to the connected battery. This current level supports relatively swift charging for many common battery sizes while remaining within safe thermal limits for the board's components.

Voltage Regulation and Termination

Precise voltage control is critical for lithium battery health. This board terminates the charge cycle when the battery voltage reaches 4.2V, with a stated tolerance of ±1%. This cut-off point is standard for fully charging most consumer lithium cells without overcharging them, which is essential for maintaining capacity and safety over many cycles.

Protection Circuitry Voltage Thresholds

Beyond charging, the board actively protects the battery. It incorporates over-discharge protection, which disconnects the battery from the load when its voltage drops to 2.5V. This prevents deep discharge, a condition that can cause irreversible chemical damage to lithium cells, rendering them unusable or unsafe.

Integrated Protection Features and Build

In addition to voltage monitoring, the board includes safeguards against electrical faults. Its physical construction is tailored for reliability and ease of use in various applications.

Overcurrent and Short-Circuit Protection

The integrated protection circuit includes a 3A overcurrent protection threshold. If the current drawn from the battery exceeds 3 Amps, the circuit will interrupt the connection to protect both the battery's internal structure and any downstream components. This also offers a degree of short-circuit protection for the connected system.

Board Dimensions and Physical Layout

Measuring 26 mm in length by 17 mm in width, the board has a minimal footprint. This compact size allows it to be fitted into tight spaces within enclosures or attached directly to battery packs. The layout includes clearly labelled solder pads for the input power connections (5V and GND) and the battery connections (B+ and B-), facilitating straightforward wiring.

Component Quality and Assembly

The board is supplied as a fully assembled unit, with surface-mount technology (SMT) components soldered onto a blue fibreglass PCB. This pre-assembly ensures correct component placement and soldering, providing a ready-to-use module that requires only the user to solder wires to the connection points.

Practical Applications and Usage Guidance

This integrated board is a versatile component suitable for hobbyists, makers, and small-scale commercial applications where managed battery power is needed.

DIY Electronics and Portable Projects

It is ideal for integrating into custom-built devices like portable speakers, LED lighting setups, robotics, or sensor nodes that are powered by a rechargeable lithium battery. The board handles the complex charging and safety logic, allowing the designer to focus on the core functionality of their project.

Battery Pack Maintenance and Repair

The module can be used to add charging and protection capabilities to existing battery packs or to refurbish devices where the original management circuit has failed. Its standard parameters make it compatible with a wide range of common 18650, 14500, or pouch-style lithium cells.

Connection and Implementation Notes

To use the board, you must solder wires from a 5V power supply to the input terminals, and from your lithium battery to the battery terminals, strictly observing polarity. No specialised firmware or configuration is required; the board begins operating as soon as power and a battery are correctly connected. It provides a simple, effective way to incorporate safe battery management into your designs.