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is my battery good?

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  • is my battery good?

    I found an old 12v battery sealed lead acid battery out in the shed, 5aH think it was used for a electric wheel chair or something like that, but my dmm reads 12.8 volts on it, yet when i hook it up to various things using my inverter it dies pretty quickly, in less than 10 minutes easily. I have a cheap little walmart charger that I have been charging it with (forgot to mention that yes, I filled the cells with water before charging) is this batteer scrap or is my cheap walmart charger not the right thing for the job?

  • #2
    Its done, and sulfated.
    MSEE, PE

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    • #3
      dang it, thats what I was afraid of, so note to self....even if a battery reads the 12 volts its not necessarily a good battery. thank you

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      • #4
        Originally posted by avp12304 View Post
        dang it, thats what I was afraid of, so note to self....even if a battery reads the 12 volts its not necessarily a good battery. thank you
        Another good rule of thumb is that most if not all "used" and "forgotten" batteries are now just dead weight. Only keeping them properly charged will a battery still have life after a few years.

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