Cleaner music when laptop is on battery vs plugged in

Just to add a litte. Usually when there is a ground loop in analog, we hear it as a hum. According to some old measurements from Stereophile, you could have a ground loop via USB which does not cause a hum but instead results in excessive jitter.

Unfortunately, Stereophile decided then to stop measuring with laptops plugged into AC outlets. IMHO, they should have kept testing with AC to encourage manufacturers to fix the problem.

Thank you everyone for the input.
@erik_squires : Which Furman equipment do you use for power filtering? I am looking for a power filter/conditioner but don’t know which one is good. Could you suggest?My budget is $300.

Thank you.

Hunt around for the Furman prices. :) You can sometimes get a BIG savings.

At the least, the two key features are SMP and LiFT. The noise filtering and surge protection is top notch.
Best,
Erik

Thank you Erik for your consultation :) I will look out for some Furman.