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Make easy portable speakers with battery and aux cord/port Answered

Long story short, I want to make a costume for a LARP with built-in speakers. I am both a busy and a lazy man, so I want to find the simplest way possible to make this happen. 

The idea is to connect my two 4Ω, 5W speakers together with a battery and a aux port. What I need to know is what kind of battery (preferably rechargeable) is best suited for this endeavour, how to connect it properly with the essential components and how to connect an aux port/cable, making it possible to connect any audio device of my choosing. 


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