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Music servers and other computer based digital audio technologies.

You do realize that....

...these USB batteries are essentially switch mode power supplies.

They typically take a nominal 3.7v Lithium battery and incorporate a boost converter chip (switching power supply circuit) to increase the battery voltage to 5VDC.

The one thing these USB batteries offer is isolation from the AC mains, but their DC output quality may or may not be any better than a wall wart switcher. In other words, you are not getting 'pure DC' off the battery itself but via the switching circuit.

Typical, but there are several such chips on the market

Edits: 04/11/17

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