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There may be some truth in that, however the plain fact is that a modern battery is giving far more CCA today than a battery 20 years ago of the same dimensions could ever dream of. Everything around us is higher performance than our aging memories, and that is being achieved in ways that require a bit of technological tlc!
In my opinion after too many years in the automotive electrical bizz. i would offer that ...
1) The starter batteries available now are not the batteries your Dad used .
2) The battery chargers are also now " intelligent " and can do things that our Dads chargers could only dream of . See the latest stuff out there .
A good intelligent battery tender and decent care will keep your AGM battery working fine for up to 10 years. I always Winter my powersport batteries in a heated basement on a battery tender, switching every week or so to a different battery, and have gotten 10 years out of a yuasa that way. A quality battery helps alot too though..avoid the Wal Mart specials.
There's nothing wrong erring to the side of caution, Remove the battery and put it on the charger. Then when you reinstall it you can clean the terminals for a hopefully trouble free riding season!!!
John
If mine wasn't in an insulated garage I would be pulling the battery to put on the tender otherwise I just plug it in at the beginning of winter and cleanup the terminals to get ready for the new season. Cleaning your terminals will be part of your maintainance anyway.
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