Dead battery on a R100R - cause?

Discussion in 'Airheads' started by bikecat, Jun 7, 2012.

  1. bikecat

    bikecat Long timer

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    Hiya,

    I did not ride my r100R for say 10 days and found the AGM battery died, turned on the ignition no lights, voltmeter reading is nought. Battery is relatively new, so I suspect there is a leak somewhere. What are the likely suspects that I should hunt down?

    The battery is indeed dead. I hooked it up to an Oximiser and hope to revive it, but I think the situation is bleak. Any recommendations on a last ditch saving of the battery or it is a sure goner?

    Cheers
    #1
  2. boxerboy81

    boxerboy81 Stay Horizontal

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    In my experience the agm types fail suddenly, little warning.

    Reasonably new may not be much of a reason either. Warranty? They can do it anytime, but usually not of course, otherwise no one would buy them. I've read that the Odyssey batteries can fail early also, and they seem to be most peoples favourite battery too.

    I've had good experience with Deka, with a recent manufacturing date stamped on it. 5 years so far, so it may be getting to it's end sooner v later. Motobatt are getting good reviews now, for good price and 2 year warranty.
    #2
  3. Unstable Rider

    Unstable Rider Moto Fartografist

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    unsubscribed.
    #3
  4. Wirespokes

    Wirespokes Beemerholics Anonymous

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    Exactly how old is the battery?

    It's hard to say what or where the fault could be. If it's not the battery, then it'll require breaking out the multi-meter and checking for current flow with key off.

    In case you're not familiar with the procedure, with a good battery leave the negative disconnected. Turn the meter to AMPS and connect the leads to the battery negative and the ground cable. If current is flowing, it'll give you a reading. If nothing, switch to miliAMPs. If still nothing, it was the battery dying. If you do get a reading, start disconnecting things till the meter reads zero. I'd start at the starter relay since it has an unswitched hot lead.
    #4
  5. bikecat

    bikecat Long timer

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    Battery is less than 6 months old. It is a Yuasa AGM 17.2 AH batt.

    Now putting it on a tender in hopes of reviving it, if not for anything for my education.

    Cheers
    #5
  6. Loutre

    Loutre Cosmopolitan Adv

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    My father had that problem on his R100S, I think he told me that it was something with the abs that doesn't wanted to shut down and ate the power even if the bike was off
    #6
  7. supershaft

    supershaft because I can

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    First things first. You need a new battery. How old is it? In my experience it really does not matter. New batteries fail all the time. Not as much as old batteries but that isn't saying much.
    #7
  8. RideAbout

    RideAbout Mentally Retired

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    You've got a drain or a bad battery from the factory. The Yuasa's are usually great. I've had "off" brands die a quick death but never a Yuasa.

    BTW, a tender will probably not reserect a dead battery, you'll need a good 1 amp charger overnight.
    #8
  9. Wirespokes

    Wirespokes Beemerholics Anonymous

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    I wouldn't say off hand that it's bad! :huh

    I've recharged batteries lots of times and had them last years and years. So just because it's dead now doesn't necessarily mean it's toast!

    True - draining a battery is bad for it, but doesn't necessarily mean it's now junk!
    #9
  10. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    I think that the Battery Tender needs to ba able to read a certain minimum voltage to start the charging cycle-- it doesn't like a dead-flat battery.

    A couple of years ago I had a problem with a sticky brake light switch in a car and it drained the battery down to zero a few times. That battery died within a year.
    #10