Drag Specialties YHD12 High Performance Conventional Battery For Harley FL / XL 1965-1984

Reliable Cranking for Vintage Engines

Classic Harley-Davidson engines, particularly the 74″ and 80″ Shovelheads, require significant amperage to turn over consistently. The Drag Specialties YHD12 is a 12V conventional lead-acid battery that offers a robust 29Ah (Amp-Hour) capacity. This high-capacity design ensures that your ignition system receives the necessary voltage for a hot spark, even during the high-load demands of a cold start.

High-Performance Conventional Construction

While maintaining a traditional vented design, this battery incorporates modern high-performance materials. It features heavy-duty lead grids and high-density active material designed to withstand the unique, low-frequency vibrations of older rigid and rubber-mount Harley frames. The internal plate separators are engineered to minimize internal resistance, maximizing the energy flow to your starter motor and protecting against internal shorts.

Authentic Fit and Traditional Maintenance

For the purist, the YHD12 provides an original equipment (OE) fitment. It is designed to slide perfectly into the large battery trays of classic FL touring models and early Sportsters. As a conventional “dry” battery, it requires the addition of battery acid (sold separately) and an initial bench charge, ensuring that the battery’s chemical life cycle begins the moment you are ready to ride. The classic white-case design with easy-to-read levels allows for traditional fluid maintenance, keeping your vintage machine period-correct.

Durability in Every Detail

The Drag Specialties YHD12 is housed in a rugged, impact-resistant case that protects the internal lead plates from the harsh environment of a vintage motorcycle engine bay. The heavy-duty terminals are designed for a secure, bolt-on connection, reducing the risk of voltage drop caused by loose or corroded terminals—a common issue on older bikes with simplified charging systems.

Fitment and Compatibility (1965–1984)

The YHD12 is a direct replacement for Harley-Davidson OEM Part Number 66006-70. It is designed for the following classic applications:

• Harley-Davidson FL/FLH Series: Electra Glide models (1965–1984).
• Harley-Davidson XL Series: Sportster models (1967–1978) with electric start.
• Harley-Davidson Heritage: Early 4-speed Big Twin models requiring a large 12V conventional battery.