I can provide some info although I don't have a vid or a detailed guide on how to do that. But you find some very useful videos from Master Bluespike at Youtube and some great wiring diagrams on the forum.
The parts you will need are the following:
Li-Ion battery holder/speaker combo (not needed when you already ordered your saber with Li-Ion setup)
BuckPuck (not needed when you already ordered your saber with BuckPuck setup)
2x 14500 Li-Ion batteries (best option: purchase the
cradle charger/battery combo)
Obsidian soundboardWires (24 or 26 gauge)
Solder
Soldering iron
Heatshrink