So,
@mattclarke18 , I look into pure battery that doesnt need any additional Battery Management systems that can introduce noises into the audio. Measured from floor noises -205db/Hz at 10kHz. That is the best there can be measured
Nickle Cadmium is the best suitable as battery packs.
These Ni-Cd packs can be found with 12V and a charger easily off Amazon or Ebay.
Ni-Cd also comes in AA sizes and it takes 10 cells in series to make up 12V for compactability. You can then buy a charger to charge up.
All you need is to make a DC cables that allow you to plug 340 into it and a charger to charge it up