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Thread: Starting/running ST with battery tender connected

  1. #1
    Site Supporter Don B's Avatar
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    Starting/running ST with battery tender connected

    OK, I've done this before a few times and shut the bike off after a few seconds. I think I may have left it connected for several minutes or until I get one bar on the temp gauge a few times, don't remember for certain. I can't tell that either the bike's electrical system or the battery tender has suffered any damage, but want to confirm whether this practice may be risking damage to the bike's charging system or any other electrical components. I used to always disconnect the battery tender before cranking up the bike in the garage, but figured I could skip that step if it isn't really necessary or recommended practice.

    Any professional advice on the subject?

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  2. #2
    spiderman302's Avatar
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    Re: Starting/running ST with battery tender connected

    I have designed a few battery chargers. To protect the circuity we put a blocking diode between the battery and the active components. This also prevents the battery from discharging when the charger is off and will protect the charger from the alternator. The only part that is directly connected would be a very high resistance voltage divider for the voltage control circuit. This circuit would be protected with a voltage clamp (TVS). So I would say that you will not damage anything. If you could there would be a lot of broken battery tenders..
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  3. #3
    240Robert ST Gui's Avatar
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    Re: Starting/running ST with battery tender connected

    I know nothing of the Battery TenderŪ innards. But it's fused at 7.5A and I have to think that there is some built-in protection against just such a situation.

    Without such protection I'd expect it wouldn't survive even one accidental start. So if the fuse and the green light survive I'd think you're pretty much golden. Still I'd not do that ever if I could help it.

    As my bike has both WnS and a BTŪ harness I've added the WnS SAE to Coax adapter so as to use my WnS and the adapter for coax-coax tender connectivity. Much easier to connect/disconnect and you'd be much more likely to do so.
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  4. #4
    AdminiSTrator Mellow's Avatar
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    Re: Starting/running ST with battery tender connected

    I've used a battery tender for years and several bikes and have started and let them idle for oil changes several times without disconnecting.

  5. #5
    DeanR's Avatar
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    Re: Starting/running ST with battery tender connected

    Have done it many times without a problem.
    1999 ST1100
    1991 ST1100
    1980 Yamaha XS1100
    STOC #7959


  6. #6
    SoCal Lane Splitting Commuter SupraSabre's Avatar
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    Re: Starting/running ST with battery tender connected

    I have always been hesitant to run my bikes with the charger attached. I just don't feel comfortable doing so...I'd probably forget I had the wire still hooked up and wind up tripping over it!
    Bob - STOC 5901
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  7. #7
    ddemair's Avatar
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    Re: Starting/running ST with battery tender connected

    Quote Originally Posted by SupraSabre View Post
    I'd probably forget I had the wire still hooked up and wind up tripping over it!
    Same concern here. So I throw the wire over the handlebar near the starter button so I can't miss it. It also keeps me from starting the bike while plugged in. NTTAWTT.

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