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Author Topic: Car batteries and concrete floors
snopes
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Comment: I just heard on a TV program that storing automotive
batteries on concrete WILL NOT drain them. This is contorary to
everything I've heard since 20 years old. I'm now 47.

What's the truth????

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Rehcsif
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Sorry no cite handy, but Click & Clack debunked this one. Your TV program is correct.

-Tim

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Bad Company
I'm Dreaming of a White Sale


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It used to be true. The older batteries were made from natural rubber and it would "leak" energy. Modern batteries are made of plastic and no longer have this problem.
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Troberg
Angels Wii Have Heard on High


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I have a bunch of batteries stored on concrete for several years, with no problems. I also can't see how it could drain them, so, just this time, trust TV.

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/Troberg

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EmeraldCityAlchemist
I'm Dreaming of a White Sale


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Actually, the role of the Earth in grounding does not come from any role in the "circuit" but is because the earth serves as an enormous sink into which a great deal of electrical charge can be conducted without changing the voltage. The Earth is considered to be zero volts - a point of reference. If I take a 220-volt electrical power line and plunge it into the Earth, the voltage will discharge into the Earth (the electrons will flow into/out of the ground) but the voltage of the Earth will not change significantly (except it may change a tiny bit locally, depending on what the ground there is made of). It does not "complete a circuit" in the sense of returning any electrical current to the power station. It DOES serve as a common reference point... the "zero" voltage for both your house and the power station. If I touch a live wire, the voltage will discharge through me into the Earth, since the Earth is always zero voltage relative to the wire. If I touch the "neutral" wire (from the power supply) nothing happens, since the neutral wire has the same voltage (zero) as the Earth.

--------------------
I wish I knew what the hell I was doing.

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Rehcsif
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quote:
Originally posted by EmeraldCityAlchemist:
Actually, the role of the Earth in grounding does not come from any role in the "circuit" but is because the earth serves as an enormous sink into which a great deal of electrical charge can be conducted ...

How does this tie into the topic?

Straight question, not being snarky.

-Tim

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HollowMan
Deck the Malls


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There were a few posts on the first page speaking of the ground completing a circuit to drain the battery. I believe this is what ECA is talking about

--------------------
Heisenberg may have slept here.

I got an idea... an idea so smart my head would explode if I even began to know what I was talking about.

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FullMetal
I'll Be Home for After Christmas Sales


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well, this is from my dad, and why he doesn't do it, but he was told the draining circuit thing, but what he really found was that concrete hold the cold more than wood, and putting on the concrete floor, (as it's more often in winter when you remove car batteries for extended periods) it doesn't drain the battery. but the cold concrete floor ends up causing the plastic casing to crack, spilling battery fluid all over the floor. so now he has a cabinet he puts the batteries in and hasn't had one freeze since
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Floater
Xboxing Day


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quote:
Originally posted by FullMetal:
... what he really found was that concrete hold the cold more than wood ...

There is no such thing as "hold the cold". What happens is that wood is a much better insulator than concrete and does not transfer as much heat to you (or from you in this case) when you touch it.

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Små hönor skall inte lägga stora ägg för då blir de slarviga i ändan

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