4S 16.8V 25A Lithium BMS Protection Board for 18650 Batteries

4S 16.8V 25A Ternary Lithium Battery BMS Protection Board

Upgrade your battery management with this compact, high-quality 4S 16.8V 25A BMS (Battery Management System) board — engineered for reliable, long-lasting performance with 18650 ternary lithium battery packs. Whether you're powering cordless power tools, solar LED lighting systems, or other battery-driven equipment, this board keeps your cells operating safely and efficiently.

Key Features

• Multi-Function Protection: Built-in overcharge, over-discharge, overcurrent, and short-circuit protection safeguards your battery pack from damage and extends its overall service life.
• Wide Compatibility: Designed specifically for 4S 16.8V 25A ternary lithium configurations — ideal for 18650-based power tools, solar LED lights, and a broad range of DIY or commercial battery applications.
• High-Efficiency Circuit Design: Premium-grade components deliver stable voltage and current output, maximising energy utilisation and reducing wasted capacity.
• Easy Installation: Clear PCB labelling and straightforward wiring ports mean even non-professionals can get up and running quickly without specialist tools.
• Eco-Friendly & Durable: A longer-lasting BMS reduces the frequency of battery replacements, cutting waste and supporting a more sustainable energy setup.

Specifications

Compatible Applications

• 18650 cordless power tool battery packs
• Solar LED lighting systems
• DIY lithium battery projects
• E-bike and portable power bank builds
• RC vehicles and hobby electronics

Please allow 2–3% dimensional variance due to manual measurement. Actual product colour may vary slightly from images due to monitor calibration differences.

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Learn more: ENERGY STAR product efficiency guidance

Frequently Asked Questions

Q: What battery configuration is this BMS board designed for?

A: This BMS board is specifically designed for a 4S (4 cells in series) ternary lithium battery configuration, operating at 16.8V with a maximum continuous current of 25A. It is fully compatible with standard 18650 lithium cells wired in series.

Q: What types of protection does this BMS board provide?

A: The board provides comprehensive protection including overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection. These features work together to prevent cell damage, reduce heat buildup, and ensure safe, stable operation of your battery pack.

Q: Can I use this BMS board for solar LED lighting applications?

A: Yes — this BMS board is widely compatible with solar LED lighting systems that use a 4S 16.8V 18650 lithium battery pack. Its stable voltage regulation and multi-protection features make it well-suited for both off-grid solar setups and portable LED lighting projects.

Q: Is this board easy to install for a beginner?

A: Absolutely. The PCB is clearly labelled with linear identification markings and colour-coded wiring ports, making installation straightforward even for those without professional electronics experience. Always follow standard electrical safety practices when wiring any battery management system.

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.