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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Battery Of Choice
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<blockquote data-quote="RossKean" data-source="post: 1418364" data-attributes="member: 19880"><p>Mine must also be an anomaly at 175,000 miles and 10+ years! Self-discharge rate for a healthy AGM battery amounts to a few percent per month. If the electrical system on your FJR is working as it should, parasitic draw (clock, immobilizer if you have one and minimal computer function) is very small - measurable in microamps. In a couple of weeks, the battery should be down far less than 10% from fully charged from self-discharge and parasitic draw. Even a modest ride will restore that much.</p><p></p><p>Unless you have aftermarket electronic bits that are drawing some power with the ignition off or unless you have a battery that has an internal "soft" short, there should be no need to use a battery tender for anything less than a month - I have gone four months and still had lots left to start the bike. Measured parasitic drain and industry-established performance characteristics for good quality AGMs support my position!</p><p></p><p>Generally for extended winter storage, I will disconnect the battery ground wire but have not always done so. A properly functioning tender that has an accurately regulated float voltage shouldn't hurt a battery but shouldn't really be needed for most people - at least not on FJRs.</p></blockquote><p></p>
[QUOTE="RossKean, post: 1418364, member: 19880"] Mine must also be an anomaly at 175,000 miles and 10+ years! Self-discharge rate for a healthy AGM battery amounts to a few percent per month. If the electrical system on your FJR is working as it should, parasitic draw (clock, immobilizer if you have one and minimal computer function) is very small - measurable in microamps. In a couple of weeks, the battery should be down far less than 10% from fully charged from self-discharge and parasitic draw. Even a modest ride will restore that much. Unless you have aftermarket electronic bits that are drawing some power with the ignition off or unless you have a battery that has an internal "soft" short, there should be no need to use a battery tender for anything less than a month - I have gone four months and still had lots left to start the bike. Measured parasitic drain and industry-established performance characteristics for good quality AGMs support my position! Generally for extended winter storage, I will disconnect the battery ground wire but have not always done so. A properly functioning tender that has an accurately regulated float voltage shouldn't hurt a battery but shouldn't really be needed for most people - at least not on FJRs. [/QUOTE]
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