I am looking for battery powered speakers to use with the Shogun. Right now I have a speaker that can be charged, but it doesn't use replaceable batteries. I'm looking for something that uses typical batteries used on film sets (like Canon LP-E6, Son L-series, P-tap, etc.)

I don't need stereo sound or high quality, just something for playback that is small and can be rigged up to my Shogun stand.

Doe anyone have any recommendations?