Re: Copper Battery Terminals

Posted by KEB on January 06, 2006 at 19:26:02 from (209.108.192.162):

In Reply to: Copper Battery Terminals posted by Jay (ND) on January 06, 2006 at 08:27:21:

I agree, pure unadulterated snake oil. First off, the conductivity of metal is not measured as a percentage of anything. I have no idea what "conductivity of 97%" means, and I'm an electrical engineer. Conductivity is measured in units called "mho-cm^-1". (mho is ohm spelled backwards, as conductivity is the inverse of resitivity, which is measured in ohm-cm)

In fact, according to my handy-dandy "Reference Data for Radio Engineers" book, the conductivity of copper at room temperature is approximately 13 times that of lead. HOWEVER, unless you are trying to pass current through a small cross section of material or over a long distance, the intrinsic properties of the material would have little to do with voltage drop.

In the case of a battery connector, there is so much lead that I suspect the total resistance through the connector is trivial compared to the resistance of the wire attached to it. The biggest single problem with battery terminals is corrosion inside the crimp.

Finally, the dissimilar metal part is also nonsense. You either have a lead to copper interface where a conventional terminal connects to the wire, or you have a lead to copper interface where a copper terminal connects to the battery post.

Keith

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