temperatures the resistance for electricity traveling thru wire and such increases. so if anything is marginal, in extreme temps, they will fail.

ask the auto stores when they sell the most batteries. hot and cold weather. and as noted above under heat soak conditions.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.