Is the 5 volt USB supply from a computer clean

[bumpy]

I use one of these, along with a couple a similar ex Maplin batteries/chargers with all my Pi's and would not go back to any mains tethered device.

https://www.amazon.co.uk/HUAF-Portab.../dp/B07M6JFCLZ


The HUAF in particular is one i like - it has a quality feel, amazing battery life and can power 2x 2.5 amp devices and a 1x 1amp device at the same time should you wish.

Its a bit bigger and heavier than it may look - about the size of an iphone 6 plus and slightly heavier.

Its also good for charging my iphone and bluetooth earphones so gets plenty of use.

Mel

Thanks Mel, that's an interesting alternative. Would I be right in saying that as its a battery in complete isolation there can be no distortion noise, or does the fact its a sensing charger mean there is something else electrical going on.