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This thread has given me an itea, I've just bought a universal motorcycle battery isolator on the eBay UK site for Ł4.99 including delivery. It isn't too large and can be fastened to a battery terminal.
And manufacturer has no incentive to reduce the life of your battery, does it? It's not like they want to sell you another battery or anything like that.
All I can tell you is I have kept every Harley I have owned for the last 25+ years plugged in 24/7 and I have had batteries last anywhere from 6 to 9 years.
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.
