In message <[email protected]>,
        Philip ([email protected]) wrote:
> 
> I want to power my net5501 from a spare 12V car battery that I have.

You want a 'Deep cycle battery' not a 'Starting battery'.  See

http://en.wikipedia.org/wiki/Lead-acid_battery

If you use a 'Starting Battery' it will not last very long.

[...]

> Also, what happens if I have a really long power cut and the battery
> gets below 6V?

If your 12 volt battery gets as low as 6 volts then it is dead and
should be scrapped.  You should not discarge a lead acid battery below
about 1.75 volts per cell, or 10.5 volts for a 12 volt battery.


Cheers,
       Nick.
-- 

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