I've made some analog measurements of Pro with a charger and with a battery power pack. There is nothing to say... all measurements I usually do were the same regardless of the power source. The only difference I've seen was when I captured a silence.
Charger model I've used was a cheap Sunny SYS1561-1105.
Pro with a charger:
Pro with a battery pack:
Charger model I've used was a cheap Sunny SYS1561-1105.
Pro with a charger:
Pro with a battery pack: