Mobile System

[mobilebeats]

I just finished my system in my 73 Chevy, a 4ch amp, 10"kicker, and a ported box.

 

Now I have a semi-related question.

 

I just got a beatbox by dr dre, and I'd like to use it as a portable system (bring to camp fires and

 

such where there are no power outlets). What could I use to make a sort of mobile power source to plug it in to?

 

I have an ac/dc converter that I could use to connect to a car battery, but I don't always have access to my car. Is there

 

an easy portable power source that can be bought or made?

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