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Calculating a Battery's Internal Resistance

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  • Calculating a Battery's Internal Resistance

    Hi Everyone,

    Does anyone know a good method for calculating a battery's internal resistance?

    I don't suppose it could be as simple as getting two identical batteries (equally charged) and then hooking the positives together and measuring the resistance across the two negative terminals and then dividing that figure by two

    That would make my 24ah batteries 3 ohms by the way but I doubt that is an accurate test
    "Theory guides. Experiment decides."

    “I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.”
    Nikola Tesla

  • #2
    Chapter 9: Internal Battery Resistance has a good howto

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