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What kind of 12v battery do I need? Answered

I've got one of these:
A Pyramid 150 watt audio amplifier, hooked up to a pair of Pyle 5.25" 140 watt speakers.
I'd like to get a 12v battery to run it it for a few hours, but I don't know what kind of amp hours I'm going to need. Any ideas? I'd use a car battery, but I want to be able to fit the whole she-bang into an ammo can. Also looking at making a fiberglass backpack speaker enclosure for snowboarding / biking, and I want to try and keep the weight down. I don't know if I can use a 12v cordless drill battery pack, or if I should try sealed lead acid batteries.


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