Going Battery Powered

I like the idea of the inverter.

Like I said it all depends on the amp/hrs of the battery, for the job it’s to do, you can charge it with whatever you want, but never have it charging while your listening, defeats the whole purpose.
I have a very nice sounding MSB discrete R2R Dac that has 5 x half brick size gel batteries in it for the different power supplies in it, it charges the batteries when your not listening and disconnects the charger when listening.

Also My Lightspeed Attenuator runs on 12vdc Li-Ion batteries lasts up to 2 weeks before a recharge is needed , most of my customers buy it also as a "purest" power option, as I only supply a linear wall wart with it.
https://www.ebay.com.au/itm/US-Portable-Super-Rechargeable-Li-ion-Battery-Pack-DC-12V-6800mAh-for-CCTV-Cam/153537757150?hash=item23bf903fde:g:CSwAAOSwq7JT5MSO

Cheers George

In my experience batteries do not have good current delivery.

Someone needs to go back to school, better still, put a dead short across the terminals of a small 12v SLA battery, but get "real close" as you may not see the current arc. 🤦‍♂️ https://ibb.co/4ZwDct1

jzzmusician
I'm a dummy; what does, "PPT," stuff mean?

Just another BS voodoo snake oil product like ($1) $150! ac mains fuses, but this ones a $300! contact cleaner
https://perfectpathtechnologies.com/product/total-contact/

Electronic engineers use as good if not better one for $22, but it's not got an "audio" snake oil signature to it.
https://www.ebay.com.au/itm/DeoxIT-Mini-Gold-spray-GN5MS-15-14g/401602406187?epid=6024006287&hash=item5d815e672b:g:954AAOSwgHpa28-g&frcectupt=true

Cheers George 
  

gear that can accept 12V DC will always sound better

Base line background noise is what your gain is with battery and you can measure it if you have a good crow, it's a sense of being even blacker between notes, in a quite room.
  

(assuming you have enough capacity to not choke dynamics)?

And a battery is not current limited, it's how long it can give that current for that important, and this dictates the amp hours needed in the size of the battery

Cheers George

Battery has always got better noise figures, from what I've measured powering the Lightspeed Attenuator. Saying that the "very best" regulated linear power supplies are "almost" as good as battery.

Cheers George