Emerg Car starter for 12V power supply?

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I was looking at one of those emergency power packs used to start cars with dead batteries (useful up here in Canadia) and wondered whether these would make a decent DC power supply for a low voltage preamp or DAC. Has anyone tried these things as power supplies? Basically the thing is a battery and charger all in one, with a 12VDC output. The one I'm looking at buying (Canadian Tire for you fellow Canucks) has a 15A capacity, so with a low drain solid state preamp I'm thinking that the thing would last quite a while before it needed recharging. At $40 CDN for a 12VDC power supply, this looks like a potential major bargain. The fact that it's small and decently designed are pluses. It outputs the 12V through a cigarette lighter plug so no big clamps either. It'd be a cinch to wire a new output.
I'd appreciate your thoughts before I end up burning down my house.
Thanks!

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Topic - Emerg Car starter for 12V power supply? - Pen Toad 15:28:00 11/29/05 (3)

But 15a for how long?! - clifff 01:10:35 11/30/05 (2)

Re: But 15a for how long?! - Pen Toad 04:32:00 11/30/05 (1)

Re: But 15a for how long?! - Tin Ear 04:43:11 11/30/05 (0)

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