Re: (ET) Batteries and lighting

["Dave & Deb" <daveb drizzle com>]

they did have a tempurature gun and were monitoring the temps of the batts
as they cooked.  also I noted that he had brought a charger for eash batt
and immediately put the battery on the charger after drawing it down to
10v
Dave

> 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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> be
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