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Keeping an acid battery 100% charged at all times can double, even triple it's life...low voltage speeds up sulfation which is what kills batteries.
I own three tenders, if something isn't going to be started for 24hrs or more, I hook up the tender. Don't buy the cheapy sears diehard model, nearly ruined a battery...was outputting 17.5v to a battery that was already fully charged...numerous complaints in the reviews.
I LOVE this tender...I had a battery that would not hold more than 90% charged...a month on this tender and it now holds 100% charged...saved the battery! It's cheaper at Amazon.
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.