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Message: <blockquote data-quote="RossKean" data-source="post: 1262756" data-attributes="member: 19880">IF the battery tender is temperature compensated and IF it is working correctly, it shouldn't hurt the battery to leave it on a float (not trickle) charge indefinitely. That said, there is no need to leave it on a tender. Self-discharge rate and parasitic current draw on the FJR are low enough that a "top-up" every month or so is sufficient (as long as the battery and bike are working properly). In a 3-4 month winter layoff, I top-up my battery maybe twice. The bike is a 2007 FJR with 147,000 miles and still has the original battery. Bike is winter-stored in a heated space. (Will likely replace the battery next season - it is noticeably weaker; but I said that last year too.)Note: A lot of battery tenders are NOT temperature-compensated and/or to not accurately regulate the float voltage. If the float is too high by even a couple tenths of a volt, you will eventually cook the battery.</blockquote>