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According to Bob May :
I thought all of the carbon/zinc type batteries had negative cases. Most did -- but the zinc/carbon individual cells are relatively rare now. An example of the zinc-carbon ones without a negative case are the ones which were used to make high voltage batteries (even the 9V ones) were a wax ring (shaped sort of like a tire) with a zinc plate at one end and carbon at the other, with the sal-ammoniac (IIRC) in between. All of the wax rings were joined end to end by melting the wax, and this connected all the cells in series. The little button on the top is the positive contact for the battery and the other end is essentially flat on most batteries today with some having a stamped bottom and sides in contact. The "little button on the top" was a metal cap over the end of the central carbon rod which was the actual positive terminal. However, the Alkaline cells use a different chemistry (I'm not sure of the details -- but it could be looked up), and the positive terminal makes the case -- which requires a strange form factor to deal with all the equipment designed to orient the button properly as a positive terminal. A standard flashlight would not care, but most electronic stuff powered by batteries does care, which is why they continue to shape things so the button is positive, even if it is connected to the case. The common coin cells are different, because there were never any of those with the button as positive. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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