What is the opinion of Reddit about the
Harman Kardon HK19.5 2.0 Computer Speakers (2-Speaker, Grey)?

I want to install a pair of speakers from an old TV into a military ammo box so I can have a portable boombox-type thing, but I need to power it with a battery. I replaces the speakers in a pair of Harmon/Kardon speakers (http://www.amazon.com/Harman-Kardon-HK19-5-Computer-2-Speaker/dp/B00005B9AS) and they work fine with the wall charger, which says it outputs 1100aM. What kind of rechargable battery could I use and how would I connect it?