Re: (ET) Batteries and lighting

[Robert Adsett <subscriptions aeolusdevelopment com>]

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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