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From: "Peter Gottlieb"
References: <0001HW.B9D43FDF0325BBB11662EAD0@news.covad.net> <0001HW.B9D4EE870344BA681662EAD0@news.covad.net> <3DB01FBB.EAF744F9@usa.net> <0001HW.B9D572FB034E39101662EAD0@news.covad.net> <3DB02E27.email@example.com> <3DB2A987.FA0DD93E@usa.net> <3DB2D4FC.B566FCAE@usa.net>
Subject: Re: Difference between AC adapter and charger?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Wed, 23 Oct 2002 02:49:35 GMT
NNTP-Posting-Date: Tue, 22 Oct 2002 22:49:35 EDT
"Robert Richter" wrote in message
> I took 15V (which is "way too high" for a car battery) to a charged
> lead acid battery and the current was only 3A. Over-voltage on a lead
> acid battery simply results in very little current that slowly breaks
> the water apart and vents the gases (or re-combines them in the
> maintenance free batteries). Even on a dead battery, it is common to
> let the internal resistance of the battery be the ONLY source of
> current limiting, and the alternator can usually handle this because
> lead acid batteries simply won't charge very rapidly. I have seen
> lead acid batteries that state "No current limiting needed at 13.8V".
Leave 15V on a 12V lead battery overnight and bad things can happen. I saw
this a couple of times with 12V 7 AH sealed batteries which got very hot and
vented H2SO4 vapor, in one case requiring an evacuation of our offices.
> Very few people make it through life without hearing of a catastrophic
> failure of a least one friend's car battery.
Where do you live? I'd like to stay away from that area. Our batteries are
much more civilized around here.
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