yea these are usually two li-ion cells regulated to 5v with battery power management
these are mass produced so their relatively inexpensive for what they are
back a few years ago we used anker branded ones to power operating system drives in audio pcs
with decent results
sd card player, modded soekris dac, class a lifepo4 amp or gb class a/b amp, diy open baffle speakers based on project audio mundorf trio 10's
Sorry to bring that thread back, but I want to ask, if anyone can bring to my place or lend me for a few hours/day, a device with MQA capabilities, for a test run in my system?
Before I pull the trigger, and by one. :)