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Maybe it's just coincidence, but my motorcycle battery and boat cranking battery get pulled at the end of the season, and go on the battery tender. I got 8 years out of my m/c battery, and 10 years out of my marine cranking (not deep cycle) battery. The m/c battery was shot, woulnd't take a charge, but my boat battery was still good, but I replaced it simply because it was 10 years old.
i have one. i've only HAD to use it a time or two when i forgot to turn off an accessory that was hot-wired to the battery. that said, in my case, you can hear the engine kind of labor trying to turn over at times. hooking the tender up for an overnight gives the battery a little more juice and helps give it a better kick to the start in the morning and it lasts a couple of months till it starts laboring again. its pretty cheap for piece of mind.
I keep mine on a tender. When I plug it in after a ride, the charging light might flash for a few seconds or so. A few weeks ago I went to get the bike out and noticed that the light was flashing after being plugged in all night. Took it down the street and tested the battery and it was showing that it was weak. I probably could have used it for awhile longer, but I replaced it so I wouldn't get stuck somewhere. So I think this is a benefit to having a tender that I hadn't considered.
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