Need to measure the internal resistance of a battery

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how to measure internal resistance of a battery

What's a good method to periodically measure the internal resistance of a battery while the battery is in use.

If that's not possible, how can I measure the battery's internal resistance while it is still connected but not in use?

Any ideas anyone?

:?:
 

please see TI's patent of BQ20z80 which is newest battery gauge product. I forget the US patent number, but with the internal resistor measured, the accuracy would be better than 99%. good luck
 

    U

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As the internal resistance of a battery depends on several factors (% of charge, temperature etc, etc) any measurements will be only estimations ..

For the basic method have a look in "output impedance"- batteries at:
https://www.answers.com/topic/output-impedance

Regards,
IanP
 

    U

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for a voltage source, internal resistance should be less than load resistance and viceversa for current source..battery is a voltage source....
 

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