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I had to replace mine after 22 months. It started dragging when I tried to start it. After it was hot, it was like a new one but cold, not so much. And when I had it checked out, it showed perfect. I was worried I'd be out somewhere and have it not start at all, so I got a new one.
Sometimes they just get to much vibration and shake themselves apart but...
Mines stock and going on 4 years old. I alternate charge it for a week at a time with my other bike in the winter. I ride as much as I can in the winter too.
I also had the stock battery for over ten years on a Gold Wing. Still going strong when I sold it.
You can't rely on the shop for maintenance you know.
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