The relais are directly connected to the 12V power supply. They let you hear what you could measure with a voltmeter - the 9/12V from the Xoro is shut off repeatedly.

I would return this power bank immediately, as its output stage is not working as expected (not reliable, not stable). This does not happen with the power bank that I use, and of course it should not happen with any such product.

> Powering on the ADI-2 Pro only works, when I plug the power cable into the 9/12V plug (output) of the Xoro.

I don't understand. This is the only way to use it, so how did you do it?

Switching on the Xoro might start a start-up process in it that sees the connected ADI and freaks out. Plugging the cable in while the Xoro is already started might work better then. Still this sounds like crap.

Yes, the one that I use is not easy to find these days. The photo is still in Google...

I use this one
https://www.amazon.com/XTPower-XT-16000 … B01MDM2V6H
and it works very good. Either the adi-2 pro uses more current than stated (which I don' think) or these relatively cheap consumer grade batteries don't last as much as they should.
the only setting I found to lower power consumption was to intuitively lower to minimum the rme display brightness.
Matthias, how long does your battery lasts more or less and what's its capacity?
Is there any setting that helps making the rme less 'hungry' ? (I don't think so..)
as I wrote in another unanswered post, I never found the right plug, I tested the many standard ones that the battery came with but they all seemed not fit and the adi-2 looses power at the minimum movement, I had to put velcro to constrain the plug.. I really wish there were a reliable connector for field use as some location recordists like me would love it I guess. the screw on plug doesn't exist anywhere, unless I didn't search well enough:)

So I ordered the bigger version:

https://www.amazon.de/XTPower%C2%AE-MP- … 9&th=1

This powerbank is quite amazing, and works flawlessly with the ADI-2 Pro. I'm sure the smaller version linked above does as well.

The powerbank is compact and not too heavy. It has some really nice features: two USB ports which are fully compatible to Apple (both charged my iPad with 2.1 A), one of both also supports Quick Charge 2 (Android). One standard DC output for 12 up to 24 V, adjustable. It can provide a lot of power (65 W). The ADI-2 Pro, playing music to a headphone, played exactly 5 hours. The LCD tells you how much Watts are currently drawn (between 12.5 and 14 with the ADI-2 Pro), what output voltage is selected (I chose 12V), and how much juice is left (switched itself off shortly after 0% was shown). The display is more accurate than I expected, for both state and power measurement.

I also measured the quality of the 12V output. The lower voltage of the internal LiPos is processed by some step-up regulator to 12, 16.5, 19, 20, or 24 V. On my older 10,000 mAh powerbank I can clearly see the switching frequency as needle within a spectrum measurement. This (newer) 20,000 mAh version either has a better stepup regulator or better filtering - there is no switching needle visible at all.

Finally this power bank can not only be charged via 5V mini USB (which takes some time), but also backwards via the DC output. The optional power supply charges it with up to 30 W (also displayed on the LCD) via 20V and 2 A, so charging takes about 2.5 hours only.

Like I said - really amazing!

I ordered it. As I wrote above the ps is optional and not always needed.

Update in our Tips & Tricks section:

https://www.forum.rme-audio.de/viewtopi … 92#p122692