The Power Source of the American Legend
Your Harley-Davidson® motorcycle deserves a powerful battery. You may ride a nimble Sportster, a road-dominating Dyna, or a cross-country Touring bike. For any of them, there is one truth: A proper battery is crucial for performance. You want every last amp of cranking power. A weak battery on a legendary machine is more than an inconvenience. It’s enough to ruin a weekend.
Many of our visitors need help matching their OEM parts, with strings of numbers like 66000340A or 66010-97E, to the replacement batteries we sell. This comprehensive guide eliminates that ambiguity entirely. We provide a definitive cross-reference that maps your original Harley-Davidson® battery to one of the most trusted names in powersports, Yuasa, and to our premium AGM line, Big Crank (powered by Deka ETX technology). Use this guide to confidently select the right fit and superior power for your Harley-Davidson® motorcycle, every time.
Why Cross-Reference Matters
Choosing an aftermarket battery is often a matter of logistics, cost, and superior technology. Sometimes, OEM parts have limited availability, or one needs an immediate replacement before a weekend ride. Or, as-is the case from the people we talk to, just want to shave $100 off the replacement costs.
This is where the Big Crank line shines. Our private label batteries use proven Deka ETX Absorbed Glass Mat (AGM) technology. AGM is a superior battery construction that provides higher cranking amps, faster recharge rates, and exceptional vibration resistance. These are all necessary specifications for Harley-Davidson® motorcycles. And gets you back on the road with power to spare.
Deciphering Harley-Davidson® OEM Part Numbers
Harley-Davidson® battery part numbers typically follow a pattern where the first numbers identify the core battery type and size. For example, 66000XXX usually points to a larger, Touring-style battery.
A key point to note is the letter suffix. If your battery number ends in an ‘A,’ ‘C,’ or ‘E’ (like 66010-97C), this nearly always denotes a minor design revision or capacity upgrade. Critically, the core replacement model number is consistent, meaning a “66000340” is generally interchangeable with a “66000340A” and the replacement options will be the same.
Battery Mart’s Cross-Reference Table
This table is your one-stop resource for finding the perfect replacement. We cross-reference the OEM part, the widely known Yuasa equivalent for comparison, and our Big Crank (Deka ETX) model, along with typical Cold Cranking Amps (CCA). You can click on any of the numbers below and go straight to the battery or the closest equivalents we sell.
Crucial Note: Always verify the physical dimensions and terminal orientation (positive/negative location) before final purchase to ensure a perfect drop-in fit for your specific model year.
| H-D® OEM Part Number | Yuasa Equivalent (For Comparison) | Big Crank (Deka ETX) Equivalent | CCA Rating (Typical) |
|---|---|---|---|
| 66000212 (Latest Touring/Softail) | YIX30L (GYZ32HL) | ETX30L (Big Crank 30L) | 400 CCA |
| 66000340 / 66000340A (Older Touring) | YIX30L-BS | ETX30L (Big Crank 30L) | 400 CCA |
| 66010-97 / 66010-97C (Dyna/Softail, Older Touring) | YIX30L (GYZ32HL) | ETX30L (Big Crank 30L) | 400 CCA |
| 65989-97 / 65989-97C (Older Sportster) | YTX20L-BS | ETX20L (Big Crank 20L) | 310 CCA |
| 65989-90 (Older models with 16L) | YB16L-B | ETX16L (Big Crank 16L) | 300 CCA |
| 65958-04 / 65958-04A (Newer Sportster) | YTX14L-BS | ETX14L (Big Crank 14L) | 220 CCA |
| 65948-00 (Sportster) | YTX14-BS | ETX14 (Big Crank 14) | 220 CCA |
| 66007-84 (FL, FLH, FLT models) | YHD-12 | No direct ETX equivalent | 350+ CCA |
| 65991-82 (Older FLH/FLT) | YB16B | ETX16 (Big Crank 16) | 240 CCA |
Big Crank: Why Our Private Label Stands Out
Big Crank batteries offer performance and convenience built for the open road.
- Performance: They are manufactured in the USA by Deka (East Penn) using cutting-edge AGM technology. They offer competitive or higher Cold Cranking Amps (CCA) than many alternatives.
- Value: Each Big Crank battery purchase includes Free Shipping, ensuring you get superior quality delivered to your door without additional costs.
- Durability: The non-spillable, sealed design and heavy-duty internal plates provide maximum resistance to the constant vibration and extreme temperatures your Harley-Davidson® endures.
- Convenience: Big Crank batteries are maintenance-free, and ship fully charged & ready to install. There’s no need to add water or perform any messy upkeep.
Ready to Find Your Next Battery?
Finding a replacement battery for your Harley-Davidson® motorcycle isn’t complicated. By checking your OEM part number against our definitive chart above, you can confidently select a high-quality, high-performance replacement that’s ready to keep you on the road. We’ve sold thousands of Big Crank batteries every year, and invite you to review our product reviews from Harley-riders, like this one for the ETX-30L:
“Works well, lasts a long time.” on September 15, 2025 by HarleyMF
“This is the second USA-Made Big Crank™ ETX30L / ETX30LA Battery that I’ve had, the first one lasted 7 years and 4 months and hopefully this one will too. The recipient of both is a 2002 Road King. I’d give it five starts but the Harley batteries all lasted 8 years and a bit. Still, that is a respectable number.”
Would recommend to a friend? “Yes.”
Ready to ride with superior power and peace of mind? Shop our full line of motorcycle batteries today! Use our detailed fitment guides to find the perfect match for your Harley-Davidson® motorcycle.
