Universal 3.7V Headlamp Circuit Board – 3-Mode Zoom & Flash

Universal 3.7V Headlamp Circuit Board – Zoom & Fixed-Focus, Three Lighting Modes

Upgrade or repair your headlamp with this compact, high-quality Universal Headlamp Circuit Board. Designed for 3.7V LED headlamps, this replacement PCB supports both zoom and fixed-focus headlamp configurations and offers three selectable output modes: Strong, Weak, and Strobe (Flash) — giving you full control over brightness and battery efficiency.

Whether you're a hobbyist, electronics tinkerer, or simply need a reliable replacement board for a worn-out headlamp, this board is a cost-effective solution that fits a wide range of standard headlamp housings.

Key Features

• Universal Compatibility: Fits most standard 3.7V zoom and fixed-focus LED headlamp assemblies
• Three Lighting Modes: Strong light, weak light, and strobe/flash — cycle through with a single button press
• Compact Size: 3.8 × 2.6 cm (approx. 1.49 × 1.02 in) — small footprint for easy installation
• Low Voltage Operation: Rated for low voltage below 50V AC or 75V DC (EU LVD compliant)
• Durable Construction: Built with quality plastic housing; color: green PCB
• 100% Brand New: Fresh stock, tested for quality before dispatch
• Battery Not Included: Compatible with standard 3.7V lithium cells (sold separately)

Product Specifications

Perfect For

• Headlamp repair and replacement projects
• DIY electronics and lighting builds
• Hobbyists upgrading headlamp brightness or mode control
• Camping, hiking, and outdoor gear maintenance

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Frequently Asked Questions

Q: What headlamp types is this circuit board compatible with?

A: This universal headlamp circuit board is designed to be compatible with most standard 3.7V LED headlamps, including both zoom-style and fixed-focus models. Always verify your headlamp's voltage and connector layout before installing.

Q: How many lighting modes does this circuit board support?

A: The board supports three modes: Strong (maximum brightness), Weak (reduced brightness for extended battery life), and Strobe/Flash (intermittent flashing). You can cycle through them using the headlamp's mode button.

Q: Does this board come with a battery?

A: No, the battery is not included. The circuit board is compatible with standard 3.7V lithium rechargeable batteries, which are available separately.

Q: What are the dimensions of this circuit board?

A: The board measures approximately 3.8 × 2.6 cm (1.49 × 1.02 inches), making it compact and easy to fit into most headlamp housings. Please allow for minor measurement differences of 5–10mm due to manual sizing.

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.