donaldtoo
Well-Known Member
O.k. Not that I know anything about car batteries, but up here in the cold winter Northeast, the cold can wreak havoc on an older battery. AAA gets tons of calls for dead batteries in winter. So we tend to replace them probably quicker than down in the warmer Southern states, as a preventative measure. The last thing you want is to be stuck somewhere in zero degree weather, with the wind howling outside; and the car won't start (providing it's not the alternator, which is far less common). Through the years, I've had both things happen to me.
Yep, no doubt the cold has a major affect on automotive batteries.
Your standard battery (although, you can purchase ones that are specially made with insulation, etc., for cold weather, plus, you can also purchase an engine heater) has to turn over an engine with, basically, molasses in the crankcase. Beyond that, the chemical reaction that produces the current is impeded by the cold. Double whammy.
But, I'd hate to think that the best way to protect against that is to purchase a new battery every single fall...
Also, although more cars won't start on cold winter mornings, more batteries actually fail completely during the summer. Heat cooks off the electrolytes, and, basically, boils 'em dead.
A battery that seemed to be an issue during cold weather, is usually fine as soon as things warm up a bit.
All that being said, I would probably rather change a battery in 105 degree heat, than -5 degree cold.
Also, one other thing I can attest to about heat and current flow, automotively...
I had a buddy that rebuilt an engine, years back. Once he got it all runnin' again, he would drive it for a while and then reach a destination at some point for a quick stop. He'd come back out shortly to try and start it, and the starter would drag. It would eventually start, but, it was a pain. Come to find out, he never reinstalled the heat shield on the exhaust manifold to protect the starter from the heat. All that excessive heat was drawin' down the starters ability to crank the motor and puttin' more strain on the battery.
Sorry for Auto Shop, but, as I've posted before, all my life, I've loved to know how things work.