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Re: (ET) Batteries and lighting



At 11:31 PM 3/12/05 -0500, RJ Kanary wrote:
Even if the battery does not 'mind ' it, most automotive computers will go to sleep at that voltage level, and the vehicle won't start.

Another thing to watch for if drawing down a battery that quickly is heating. Again if you have 5 millohms of internal resistance that's 800W going into the battery. A battery has a lot of mass but with that kind of power it's going to start heating up. By way of comparison electrical space heaters run about 1500W.

The test may not have been long enough to cause much heat buildup. The test sounded as if it were short enough that the battery could heat up internally and have it take a while for the heat to make it to the outside case.

Robert

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