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Why Won't a Frozen Battery Start a Vehicle.
A battery that is perfectly good why when it is -30C
won't it start a vehicle. Please note we are referring to a perfectly good battery and a totally functioning car. What is happening to the battery that it cannot crank the starter fast enough. Chemically something is happening inside the battery. Is it the electrolyte that freezes and chemically do what it should do? Does something happen to the lead plates? Does the 12 volts drop to a lower voltage? Does the current output of the battery drop? The cold is doing something to the battery What Is That Something? Well informed auto mechanics please step up to the plate! I do not need to start my vehicle my spare battery connected in parallel with the frozen battery does that. If your frozen battery won't start your vehicle and you remove it and take it indoors and let it heat up to house temperature, after reinstall it on the vehicle' it will then start the vehicle. What is happening to the battery internally at -30C? Denny B |
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Roughly 1/29/04 18:34, Denny B's monkeys randomly typed:
> A battery that is perfectly good why when it is -30C > won't it start a vehicle. Essentially your battery doesn't like cold much better than you do. Several things. The two big ones are that the power from the battery is due to a chemical reaction. That particular chemical reaction, like most, slows down at lower temperature. The other issue is that the battery will freeze at -30C if it is *roughly* only 60% charged. If frozen, the battery still can produce power, but not enough to internally warm up the battery or turn a starter in cold engine oil. > Please note we are referring to a perfectly good battery > and a totally functioning car. Which may or may not be keeping the battery fully charged to 100% charge, particularly if not driven long enough. As the charge on a battery goes down, the freezing point comes up...and the chemical reaction producing power goes down. Street batteries at 100% charge will freeze in the -40 range or so. With the addition of a bit more concentrated sulfuric acid, you can extend the freezing point down to about -70C. A trickle charger on the car overnight works for many reasons...it keeps the battery fully charged, but also the very slight heat produced by the chemical reactions in charging keep the battery a bit warmer. You can also get thermal wrap blankets and tops for your battery for some makes... or afermarket. -- Now that Spirit Rover has confirmed the presence of weapons of mass destruction on Mars, we are preparing to invade... |
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