If mine's (bike) in the garage, the Battery Tender is on it.
Keep in mind, Battery Tender brand is a float charger and will not overcharge your battery, and will stop function in the event of a short.
Not all brands are created equal.
My Yousa battery in my Honda race bike: 6 years.
My fiber-cell HD battery: 7 years.
A friend's Fiber-cell HD battery in his 2001 RK: 8 years.
All with a Battery Tender brand maintainer.
Coinicie....coincida.... Koincidq..... Dude!! Is it a Goocher?
Harldy.........!!

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HERD meber #10
DISCLAIMER: Any information, advice or child raising tips I give on this forum should be taken with a grain of salt, 8 hours sleep and at least 6 beers.
Following my instructions will likely lead to death, mental retardation and/or bodily injury, consistant with eating lead-based paint chips, and by doing so, will release me, my family and my dog from any legal action(s) for listening to anything I recommended.