Yes, that's possible. You would need the following components and of course some soldering experience!
1) 14500 Li-Ion battery pack/speaker combo
2) Obsidian sound board
3) 2x 14500 Li-Ion batteries
4) 1000mA BuckPuck (if not already installed, you might want to check that)
5) momentary switch (plastic guarded switch or metal AV switch - for the AV you would have to drill out the existing hole to 16mm)
6) optional: Flash on Clash-ready LED module
You find wiring diagrams for this in the forum, too