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Check my Battery with my multi meter?

Discussion in 'Bad Dog Cafe' started by OlRedNeckHippy, Oct 19, 2020.

  1. OlRedNeckHippy

    OlRedNeckHippy Friend of Leo's

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    Can I Check this Battery with this multi meter?
    If so, how ?
    The charger is on it in the pic.
    20201019_183540.jpg 20201019_183439.jpg
     
    Last edited: Oct 19, 2020
  2. stormin1155

    stormin1155 Tele-Holic

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    Sure you can! Set it for DC V 20.
     
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  3. Torren61

    Torren61 Poster Extraordinaire Gold Supporter

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    Well, your multi meter is going to show what's in the battery at that moment and not under load. So you can get a good voltage reading but that might change when it's trying to do work. I don't know how you'd test for that with a multi meter.
     
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  4. Dano-caster

    Dano-caster Tele-Meister

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    If you are having a problem with that battery, this is the test.Throw it up in the air and if it comes back down get a new one.
     
  5. DougM

    DougM Poster Extraordinaire

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    Testing a battery with a meter will only tell you if it has any voltage, but it could still have no current capability. This is like the old drugstore tube testers, which would tell you if a tube was alive or dead, but not if it was functioning properly.
     
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  6. MarkieMark

    MarkieMark Friend of Leo's

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    As others have stated, yes you could test the existing voltage of the battery with that, but that would give limited info.
    IE: it could show voltage in an acceptable range but still be bad.

    To start with, what we are missing here is a symptom.
    Next, what is the chemistry of said battery? The only clue is the charger, which shows multi-chemistry capability.

    In my experience, if it is ni-cad, has some age on it and doesnt seem to "hold a charge"
    Stop wasting your time. Toss it in the recyclers bin and dont look back. Save you multi-meter for fun things like evaluating guitar pickups.

    And actually, no matter the chemistry, if its not performing as expected, its probably done.
    And just as well, if its ni-cad, dont even invest in replacement. You need a cordless tool upgrade.

    But fyi, the proper test regardless, would be to monitor the voltage under a nominal load appropriate for the battery capacity and to track the voltage over time.
    All results of this test, regardless of battery chemistry will degrade over time and number of charge cycles, with some chemistrys performing far longer and better than others. And with ni-cad at the bottom of the performance scale for modern designs.

    Next question please...
     
    Last edited: Oct 19, 2020
  7. OlRedNeckHippy

    OlRedNeckHippy Friend of Leo's

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    Thanks guys.
     
  8. joe_cpwe

    joe_cpwe Tele-Holic

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    Multimeter....tongue....plenty of ways to check a 9 volt battery
     
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  9. Obsessed

    Obsessed Telefied Silver Supporter

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    Actually, you can measure the volts DC from your 20 V setting and then charge the battery and test it again to see if it is charging very well. It won't show you much more, but it will eliminate the charger or the battery as major issues. Consider it the first step in troubleshooting.
     
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