'93 R100 Dead In Texas

Discussion in 'Airheads' started by Martian, Oct 31, 2012.

  1. _cy_

    _cy_ Long timer

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    a little late, but most Oriellys will stock a good quality AGM motorcycle battery for about $90.

    if your charging system is working ... 13.8v-14.2v measured at battery while engine is revved up past idle. yes your charging system can charge intermittently.

    resting voltage for gel and AGM cells fully charged is about 12.8v. it's common for dead batteries to charge to 12.5v, then drop to 10.5v under load. battery at 12.5v resting is about 80% charged.

    when a new fully charged battery is installed. everything will return back to normal even on a system not charging. your bike will run normally until battery is depleted. which without lights will be about 1-2hours depending on amp hour rating.

    folks have been known to strap on a full size car battery. then run completely off battery until bike can be limped home.
    #21
  2. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    This is why I'm not a fan of Gel batteries. When they go, they go suddenly. And there is no way to keep a check on the status of individual cells. At least a slosh, lead-acid battery usually gives warning when it it about to expire and the state of each cell can be easily checked with a readily-available hydrometer. Typically when the battery is nearing the end of it's service life one or more cells will start to show less charge than the others.

    A good battery and an on-board voltmeter make for confident travelling.

    --Bill
    #22
  3. _cy_

    _cy_ Long timer

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    BMW offers Gel batteries as factory replacements. AGM batteries is the way to go vs wet lead acid. besides not worrying about spilling acid if your bike tips over. gel cell batteries have a slightly lower charge threshold. one can damage a gel cell by using the wrong charger.

    if taken care of by not letting battery drain too low. I've had AGM batteries last 5+ years.

    AGM cell has a very low self discharge (aprox. 3% per month). providing your bike doesn't have a parasitic drain. AGM doesn't need a battery tender over the winter.

    LiFePO4 batteries if you've got spare $$$ and wish to drop 10lbs or so.
    #23
  4. bmwblake

    bmwblake upside down parker

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    amen. i had the same thing happen with a battery. all was well until it wasn't. no indication of it being near the end of its life.


    #24
  5. hardwaregrrl

    hardwaregrrl ignore list

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    Eckhmmmm......

    <a href="http://hardwaregrrl.smugmug.com/Other/misc/16038929_6qzPj6#!i=1404228388&k=f4cJGBt&lb=1&s=A" title="Photo & Video Sharing by SmugMug"><img src="http://hardwaregrrl.smugmug.com/Other/misc/i-f4cJGBt/0/L/2967678203_b8eef718bb_b-L.jpg" title="Photo & Video Sharing by SmugMug" alt="Photo & Video Sharing by SmugMug"></a>
    #25
  6. villageidiot

    villageidiot Long timer

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    I guess that's one way to do a valve adjustment without losing any oil.
    #26
  7. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    Still, none of those are compelling reasons to use a Gel battery.

    Again, as the next post says:
    --Bill
    #27
  8. ignatz72

    ignatz72 call me iggy

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    A few posts above make me think clarification is needed here - Gel and AGM batteries are not the same thing. They are similar Valve Regulated Lead-Acid technology, but the electrolytes completely different. They do have similar pros and cons.

    You can use a regular Deltran Battery Tender on an AGM, you should not use these on a BMW or other Gel. Etc., etc.

    It's like saying a biodiesel wagon and a gas car are both road vehicles, since neither is a train, but you shouldn't swap the fuels around.
    #28
  9. Stagehand

    Stagehand Imperfectionist

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    :eyes :clap
    #29
  10. Big Bamboo

    Big Bamboo Aircooled & Sunbaked

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    Oh.... I thought he was bleedin' the brakes.:huh
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  11. Martian

    Martian Long timer

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    You are absolutely correct. Mine was an AGM that failed. It was not a Gel.
    #31