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Thread: How to "revive" a dead AGM type battery

  1. #1

    How to "revive" a dead AGM type battery

    I came across an interesting article about how to revive what appears to be a "dead" AGM type battery, when it fact it is just too discharged for a battery charger to recognize that it is attached.

    The trick it to connect a healthy(fully charged) 12v battery in parallel (positive to positive, etc) with the 'bad' battery and then connect your battery charger to one of the batteries. The battery charger should then start charging the pair, and once the 'bad' battery has enough voltage, you can remove the 'good' battery and continue with the charge.
    John H

  2. #2
    Big Red's Avatar
    2003 ZX9R
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    Jun 2005
    Irving Texas
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    Re: How to "revive" a dead AGM type battery

    Thanks for the tip John

  3. #3
    st1300r's Avatar
    st1300 '04
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    Apr 2007
    New Jersey
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    Re: How to "revive" a dead AGM type battery

    I forget but I think the bat tender looks for 8volts to decide if it is hooked up to a battery and initiate a charge.
    Chances are good though if a battery is that low, particularly if it sat, it may charge back to nom voltage but have very low cranking amps.
    Carl, SToc#7163, ST1300 '04

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