Power Supply

Batteries have chargers. Unless you disconnect the charger you are running your charger you are running off the charger power supply which is usually not of high quality since the battery doesn’t require a quality power supply.

In your case you're running off the inverter in your battery system, again, not of audio quality.  Maybe it is a real improvement but often people in your situation are experiencing confirmation bias.

Jerry

@blisshifi can you explain the configuration of the battery systems you represent?

1.  confirm that you are actually supplying AC to the amp.

2.  If AC, what can you tell us about the specs on the inverter.  Not aiming this comment at you, but I think it is false advertising to tell people they are running off a battery (sounds very stable DC) when in reality they are running off an inverter that they know nothing about and then ther amp is converting it back to DC.   Household emergency power battery systems have basic inverters in them that do not put out particularly clean power.  how do your inverters compare to, for example, the industry standard PA Audio regenerator system.  the PS audio regenerator inverter is measured at .1% THD or better.  for reference the electricity on the grid is 2-4% THD.  (for the readers:  Don't confuse this THD with the amplifier output THD which is a different measurement). 

3.  How do you isolate the charger?  if the charger isn't isolated, then your inverter i is being fed by the charger and the battery is just standing by with no current flowing in or out.

thanks,

Jerry

@kob 

Best of luck with your omipotence.  Love and kisses, Archie.

@kob pretty sure we'd have nothing to talk about.  You already know it all.