<div> Up here in the - degrees, a cooler wouldn't do it.</div> <div> On one of my older SAT's I left it out and it went down to 0 F, that lowered the battery's capacity, and it went below the holdon voltage. I lost the 'housekeeping' on the program, for the SAT. </div> <div> I had to have it reprogrammed, by Inventronics.</div> <div> I learned my lesson, don't forget to bring tools in, at night.</div> <div> I don't think the same thing would happen with the SATlll, as it has 'flash' memory. i noticed the battery on mine wouldn't hold a charge well either after I left in the car for just a few minutes, which turned into a few hours, in 100 degree heat. who knows how hot it got in the car. the top corner of the SAT had melted a bit. i told paul sanderson that the battery wasn't holding a charge at all, and that i had left it out in the car in the heat. he said it probably wasn't the heat and replaced the battery under warranty. lucky for me. daniel carlton</div>