I was at a ham radio convention a few years back, and during a talk about batteries this came up. The engineer that was giving the lecture stated it is possible for a lead acid battery to discharge from sitting on a cold floor in a warm room. The logic was the temperature difference between the top and bottom of each cell. Basically the warmer top would try to charge the colder bottom. This is because the chemical action in the battery, it's voltage is dependent on temperature. The action is totally confined to each cell, and the only thing the case of the battery has to do with it is its thermal insulating value. In a vehicle, the battery is the same temperature all over, and in fixed backup service, use and the charger keep it at an even temperature. Setting a battery on a piece of wood, like we are all told to do, simply provides thermal insulation.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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