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Yuasa makes EXCELLENT batteries. They are a household name in Japan and as stated above, come standard on H-D's in Japan. Mine's still cranking pretty strong for going on 5 years, now.
The best thing about Yuasa batteries is that they are packaged and shipped Dry. You can set one on your parts shelf for years. Simply activate with acid when needed.
Yuasa has a user friendly web site. Plug in your year, make, model and you'll see the manufacturer stock number. Note: Yusasa makes 2 batteries for Softails. One has higher CCA's.
I used to work as a field service tech in the commercial power industry for a company called enersys. Enersys was the former yuasa stationary power (commercial power systems), and prior to that was exide. Enersys/yuasa is/was the major player in commercial power, alongside C&D battery. We had a reputation for the finest battery systems in the industry. Verizon is the largest contract, with enersys/yuasa systems in every central office and cel site in at least the northeast. As others have said, yuasa is top notch and has been a player for years in all forms of batteries and you can be confident in their products.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.