How to Measure the Internal Resistance of a Battery

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[kentherapy]

Helpful video. Although the internal resistance is a constantly changing value, it is enough for a basic explanation. Don't buy cheap batteries. Their resistance will take revenge on you....😂

[parviz]

Good job very helpful video
Thank you buddy

[eili_]

Hello
-batteries can be used to calculate the resistance of a cable (fault loop impedance)
and what would be different from the current video
- thank you and have a good day

[steadyfield]

The problem is, the internal resistance has many definitions. What you are measuring is long-term DC resistance (the DC internal resistance can be varying as well). The internal resistance measured by the common internal resistance meter is AC 1kHz resistance. There are huge differences between AC resistance, short-term DC resistance and long-term DC resistance (one of the root cause could be the nonlinearity of the chemicals such as polarization). The internal resistance (or to be more accurate, impedance) is a complicated topic and cannot be explained clearly with few words, you can search for EIS (electrochemical impedance spectroscopy) for more information, as well as some test standards such as HPPC (hybrid pulse power characterization).

[schitlipz]

R[internal] = R[load] * ( V[open] / V[load] - 1 )
Use R[load] at about 10 ohms.

[stefano.a]

The load resistor in the example has too low resistance. The internal resistance variates according the load. Try with another load resistor and you will find another internal resistance value.

[armenvegas]

I always thought it was "Lucid Science"