Popular mythconceptions

[lennyzx11]

So if the ambient temprature is 90 deg. F and the Concrete floor ambient temp of 86 deg F, you would expect that to make your battery weaker? Vs. letting it set on the metal battery carrier in a vehicle?...

Yeah, the concrete floor things should have been put to bed a long time ago. Lets charge up 20 batteries all brand new and unused. Let put them in a garage. Lets put 10 of them on the concrete floor of the garage and put the other 10 on a wooden bench about 4 foot off of the floor. We will leave them there for 1 year. Then let's take specific gravity reading of the 20 batteries and make an Excel spreadsheet of the results of our specific gravity tests.

What do YOU think the results will reveal?

Just quoting a “myth” K0ua. It was meant tongue in cheek.

 

[Wagtail]

I don't own a GPS and before I had a compass in my truck, I would look for satellite dishes for direction.

I've used that method, especially whilst in a city, to get my bearings... down here a dish is always orientated North.

Oh, and in the same vein, moss grows on the South side of trees. :earth:

 

[Jstpssng]

Concrete is usually quite conductive and placing a battery on concrete will in fact create a capacitor in effect, using the plastic bottom as the dielectric. BUT, a capacitor only passes AC, not DC, so that still doesn't explain it. The only other thing I could think of would be a usual temperature difference between ambient and the floor being colder.

Very early on in this thread I pointed out the actual origins/reasons for not leaving a battery on concrete floor... which haven't been valid since manufacturers changed from rubber to plastic cases.

 

[lennyzx11]

People crawling around in attics aren't really worried about shorting a circuit,they are worried about COMPLETEING a circuit through their body.:shocked:

This struck home as my butt was crawling through an early 1900s attic yesterday to wire up a ceiling light for my wife’s new “business”. Knob and tube, bx wiring, exposed wiring ends taped over and or wire nutted sticking up out of the old rock wool insulation. In July.
While maneuvering over ceiling joists that were 4 feet apart on my belly and knees!

 

[k0ua]

Concrete is usually quite conductive and placing a battery on concrete will in fact create a capacitor in effect, using the plastic bottom as the dielectric. BUT, a capacitor only passes AC, not DC, so that still doesn't explain it. The only other thing I could think of would be a usual temperature difference between ambient and the floor being colder.

Which has been PROVEN to extend the lives of lead acid batteries . SO putting a lead acid battery on the cooler concrete floor would extend it's life slightly.

 

[rangerfredbob]

AH - the bane of many a lost hiker. Moss always grows on the North side of a tree.

Yeah, out here in the Northwest, moss mainly grows on the OUTSIDE of trees, it's wet enough that unless they get direct sunlight at times of the days it'll grow all the way around most trees, at least from my experience... I'm sure that's what you are hinting at

 

[bcp]

That would be useful to figure out whether you are inside of a tree or on the outside.



Bruce

 

[/pine]

This is neither a myth or a misconception...

l/a batteries (especially deep cycle) will lose as much as 1% of their charge per day if left disconnected...

 

[Jstpssng]

That's a misconception only because it once was true. Batteries were originally made of rubber, which is porous so could create a circuit when in contact with the floor.
Now they're plastic so the above isn't true anymore.

Which has been PROVEN to extend the lives of lead acid batteries . SO putting a lead acid battery on the cooler concrete floor would extend it's life slightly.

Read the quote above, which I made about 200 posts ago. That should give a good idea of how myths get started... people only see what they want to see.

 

[goeduck]

I've used that method, especially whilst in a city, to get my bearings... down here a dish is always orientated North.

Oh, and in the same vein, moss grows on the South side of trees. :earth:

Why is that? The earth is flat. :thumbsup: