Hi
I've been using my pro+ with battery pack, even the batt pack has regulator inside it , I found bass is more dynamic and EQ in pro+ turned off , the battery power wiim pro+ and Airist DAC , every night around one hour ( one album ) , and it nearly a month now without charging, this combo sound good, better than the plug pack supplied with DAC and Pro+ , the whole combo fed into Nait5 , and KEF 104 model 2 speaker.