Hi would there be an easy way to use batteries power up my amplifier with rechargeable battery packs with a charging circuit cut off switch and also power the raspi with 5.5 or 6 volts.
Your rPi will be fried with 5.5 Vor 6V.
I’m successfully using my DIY build boombox, which is running on 18V Makita battery powering the amp directly and the Pi with display thru a 5V step down module.
Works like a charm…
It goes about 4 - 4,5 hours on one charge…
Darn, this is still in my collective mind, the Pink Box 
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