Message-ID: <4471EF73.1030100@wolfmountaingroup.com>
Date: Mon, 22 May 2006 11:05:55 -0600
From: "Jeff V. Merkey" <jmerkey@wolfmountaingroup.com>
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To: Christian Trefzer <ctrefzer@gmx.de>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>, Jan Knutar <jk-lkml@sci.fi>,
       Pau Garcia i Quiles <pgquiles@elpauer.org>,
       linux-kernel@vger.kernel.org
Subject: Re: [IDEA] Poor man's UPS
References: <200605212131.47860.pgquiles@elpauer.org> <20060521224012.GB30855@hermes.uziel.local> <200605221604.16043.jk-lkml@sci.fi> <20060522151303.GA4538@hermes.uziel.local> <1148312458.17376.54.camel@localhost.localdomain> <20060522154830.GA5344@hermes.uziel.local>
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Christian Trefzer wrote:

>On Mon, May 22, 2006 at 04:40:58PM +0100, Alan Cox wrote:
>  
>
>>Lead acid batteries should be kept well charged to avoid sulphation and
>>always full charged when recharging, preferably using a charger that
>>will do proper three step charging. "Cycling" a lead acid battery is a
>>great way to destroy it.
>>
>>    
>>
>
>So it is better to use only one battery (or an array thereof) which is
>sort of charged and discharged at the same time, or is this idea just as
>screwed..? I don't have a degree in electronics, mind you : )
>
>Might be easier to build something that keeps a battery well maintained
>and switches in case of power outage. With large enough condensors to
>bridge the gap, which would also iron out any peaks and stuff, this
>should work pretty well.
>
>Kind regards,
>Chris
>  
>
You know, these old lead acid batteries are a fire hazard, not to 
mention they produce free hydrogen gas when discharging to charging.

Guys, stick to nicads or a fuel cell to avoid burning down your house or 
the neighborhood.  Ever see a lead acid battery explode?  I have.  It 
throws sulphuric acid all over the place.

Jeff
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