I just wanted to add a quick comment about the ‘mAh’ rating of these portable battery units. The ratings they used are a bit of a cheat… since they use the capacity of the internal LiPo batteries as a measure, not the output voltage you’re expecting.
For for example a power bank rated at 10000mAh is actually 10000mAh at 3.7v (the voltage of LiPo batteries).
For a 5v output you get ‘effectively’ 10000 / (5/3.7) = 7400mAh (actually less, since the voltage conversion swallows 5-10%)
For a 12v output you get ‘effectively’ 10000 / (12/3.7) = 3083mAh (again, factor in inefficiency of conversion)
For this reason it can be easier to do these calculations using Watts (energy). W=V x I so the amount of Watts of energy in our 10000mAh power bank is 3.7 x 10 = 37W. (10000mAh = 10Ah)
So with the Digitakt running at 7W, 7 into 37 gives you 5.2 hours usage… or perhaps slightly under 5 accounting for inefficiency.