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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Battery on the ground
On Mar 20, 1:12�pm, Don Foreman wrote:
On Thu, 20 Mar 2008 10:37:44 -0500, "*" wrote: Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote in article 0... "SteveB" fired this volley in news:ddaab5- : I have heard that if you sit a battery on the ground or concrete that it will lose its charge faster. �Is this true? If the ground or concrete is cold enough to freeze it, yes. �Otherwise, that's just an old wive's tale. LLoyd It was actually true of the old hard-rubber cased batteries. Electrons WOULD leak through the porous case to ground - eventually discharging the battery. It is NOT true of today's batteries. Correct. �- B.S.! If that were true batteries sitting in a metal battery holder in the vehicle would discharge. My personal observation on the subject is that batteries with the older vent caps in time built up a deposit of sulfuric acid droplets on the top as a result of charging. When the battery was placed on a cool surface like the ground or a cement floor the battery cooled down and moisture condensed on it and joined the acid to form a conductive path from the + to the -- terminal. I verified this with my multimeter. (Sorry Don, I enjoy your posts, you usually have the best information.) Engineman |
#2
Posted to rec.crafts.metalworking
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Battery on the ground
On Thu, 20 Mar 2008 10:37:44 -0500, "*" wrote:
Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote in article 0... "SteveB" fired this volley in news:ddaab5- : I have heard that if you sit a battery on the ground or concrete that it will lose its charge faster. Is this true? If the ground or concrete is cold enough to freeze it, yes. Otherwise, that's just an old wive's tale. LLoyd It was actually true of the old hard-rubber cased batteries. Electrons WOULD leak through the porous case to ground - eventually discharging the battery. It is NOT true of today's batteries. Correct. |
#3
Posted to rec.crafts.metalworking
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Battery on the ground
On Thu, 20 Mar 2008 12:58:28 -0700 (PDT), "
wrote: On Mar 20, 1:12?pm, Don Foreman wrote: On Thu, 20 Mar 2008 10:37:44 -0500, "*" wrote: Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote in article 0... "SteveB" fired this volley in news:ddaab5- : I have heard that if you sit a battery on the ground or concrete that it will lose its charge faster. ?Is this true? If the ground or concrete is cold enough to freeze it, yes. ?Otherwise, that's just an old wive's tale. LLoyd It was actually true of the old hard-rubber cased batteries. Electrons WOULD leak through the porous case to ground - eventually discharging the battery. It is NOT true of today's batteries. Correct. B.S.! If that were true batteries sitting in a metal battery holder in the vehicle would discharge. My personal observation on the subject is that batteries with the older vent caps in time built up a deposit of sulfuric acid droplets on the top as a result of charging. When the battery was placed on a cool surface like the ground or a cement floor the battery cooled down and moisture condensed on it and joined the acid to form a conductive path from the + to the -- terminal. I verified this with my multimeter. (Sorry Don, I enjoy your posts, you usually have the best information.) Engineman Huh? Read back thru the thread. We're in violent agreement. Batteries do not discharge faster when sitting on concrete. If anything they discharge more slowly if the concrete is cooler than ambient. Cold batteries have less capacity than warm ones, but they regain it when they warm up again. Self-discharge is a chemical process, and chemical processes proceed more slowly at lower temperatures. |
#4
Posted to rec.crafts.metalworking
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Battery on the ground
On Thu, 20 Mar 2008 12:58:28 -0700 (PDT), "
wrote: On Mar 20, 1:12?pm, Don Foreman wrote: On Thu, 20 Mar 2008 10:37:44 -0500, "*" wrote: Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote in article 0... "SteveB" fired this volley in news:ddaab5- : I have heard that if you sit a battery on the ground or concrete that it will lose its charge faster. ?Is this true? If the ground or concrete is cold enough to freeze it, yes. ?Otherwise, that's just an old wive's tale. LLoyd It was actually true of the old hard-rubber cased batteries. Electrons WOULD leak through the porous case to ground - eventually discharging the battery. It is NOT true of today's batteries. Correct. ?- B.S.! If that were true batteries sitting in a metal battery holder in the vehicle would discharge. My personal observation on the subject is that batteries with the older vent caps in time built up a deposit of sulfuric acid droplets on the top as a result of charging. When the battery was placed on a cool surface like the ground or a cement floor the battery cooled down and moisture condensed on it and joined the acid to form a conductive path from the + to the -- terminal. I verified this with my multimeter. (Sorry Don, I enjoy your posts, you usually have the best information.) Engineman I read this again more carefully. I see what you're saying. If a heatsink like a concrete floor cools the battery below the dewpoint of ambient air, condensation will occur on the battery and provide a discharge path. In such a case, the concrete floor would also be damp for the same reason that the battery is. That has nothing to do with self-discharge, merely indicates the condition that could result in self discharge. That doesn't happen in my garage, but I can certainly imagine that it does in some climates. I think you broke the code. |
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