Why are you fixated on car batteries? They are totally useless for battery
backup systems. The plates are designed for heavy short duration loads *ONLY*.
They will sulfate out quicker. It's just not worth the trouble.
Rick

Ed Browne wrote:

> A few minutes ago, I spoke to my friend, who happens to be a chemist turned
> software developer, and he said that we are generally overly paranoid about
> hydrogen.  He said that whereas the car batteries had vents, most new ones
> are closed systems that don't require that you add water and have a catalyst
> to recombine the hydrogen and oxygen.
>
> He went on to say that most of the battery backup electronics, including
> his, has low voltage detection so that power is turned off when battery
> voltage drops below 11.5V.  He countered most of the concerns so I'm left
> once again thinking it may be a good idea.  Perhaps the smart thing would be
> to watch his system for a while to see what happens.
>
> Please don't shoot the messenger, but any counters to his arguments?  Anyone
> else doing this already?
>
> Thanks,
> Ed
>
> -----Original Message-----

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