Posted by kcm.MN on September 14, 2017 at 18:22:15 from (174.219.1.225):
In Reply to: Battery discharging posted by chris english on September 14, 2017 at 17:01:26:
In past years (ie:, long, long ago), the shells used for batteries would cause condensation on the shell (or case) and there apparently was some amount of moisture movement that was capable through the shell. When this would happen, the condensation could make a very slight contact between cells, thereby discharging them over a few weeks time.
Has been quite a while since I had that explained to me, so probably did not do a very good job of explaining it, but hopefully it's enough to answer the question.
Shells nowdays are made of different materials that cannot allow moisture to permeate through. Now, some folks will say, "Hey, if the cases are waterproof, how can moisture get through?" The best way I can answer that question is to point out a fabric called Gore-Tex that is used in many rainsuits and other clothing. This material will not allow for "water" to flow through, but will allow water vapor to pass to the outside. Gore-Tex is nice as the vapor seems to flow in only one direction. But for the battery shells of yesteryear, moisture vapor could pass both ways through the seemingly impervious materials.
Another example (and probably a better one) is concrete. In the old days, concrete was used to built cisterns, and even though they held water, water vapor could still pass through.
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