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A few people have successfully tried this, so it’s definitely possible.
Keep in mind that low cost/ poor quality external power banks can bring some noise or interference. It depends on the quality of the filters on converter output. You need a powerbank that provides
-12V DC, 500mA minimum
-center positive polarity
-2.1mm plug
Just make sure you buy something that gets good
reviews, there are powerbanks out there that check all the boxes. Most come with interchangable plugs in different sizes with positive on one side and negative on the other, so it’s important you get the polarity right to avoid damage. Other than a plug that fits of course, but 2.1mm is pretty common.
