That’s kinda reasonable, because the USB spec is way too loose in this regard.
Personally, I trust some reputable manufacturers if they’re generally known for consistently delivering high-spec devices. That list is small tho’.
Even better, makes the choice easier 
This thread is long since 10 years when a small list of reputable batteries could just be pin pointed at the entrance
Now I use an inexpensive Ultron power bank made in China for sale German along with a custom adapter cable from hi-fi components and this, in addition to portability, turned out to be an inexpensive way for me to improve the sound of my Elektron DIGITONE device. Loved him again!
Hey thanks for all the helpfull info. Sadly tge links are down. I look for a cheap solution for my machinedrum. Where can i find a small powerbank for that?ravpower still
one of the cheapest options?
I am from germany so i got 2 pin power cable with my md but there was a 3 pin uk adapter with it. I am total noob with energy so far i just took it from the wall. XD
For those of you into park jams (when it’s warmer outside), I just wanted to share my discovery. I was able to power up my Digitakt & Octatrack mkII using a battery used by the Soundboks portable speaker. That should provide 100wh, which is plently of jamming time. For the dc plug I used a small adapter to adjust for the smaller sized electron dc socket.
Hardly can wait for the spring!
Bought this battery from GP but now I feel confused…
It has 3A but only for 5V?
So it wont power an Octatrack that requires 2A at 12V?
it does say 12v at 1.67A in the selected text
each voltage value of a power bank has its own amp rating
Thanks for confirming!
That’s how I interpret it after looking closer. Should’ve looked carefully at the details before ordering 
I’m wondering about this ripchord “combiner” cable too?
I’ve got a 12v myvolts that works great for octatrack and big usb battery, but just tried it on rytm and it’s not providing enough current.
Has anyone got a working solution for battery power to analog rytm from a usb battery pack? i’m reluctant to buy a bespoke 12v battery just for this!
ah ok answering my own question, sorry for the noise, this claims it’ll do it, usbc birdcord
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just make sure you battery pack offers ‘PD’ charging for the birdcord cable.
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I got 2 Ripcord cables 12VDC to power my Digitakt and Digitone and these work like a charm!
I love that with ripcord I can also power my devices by using a normal usb charger plug (which makes travelling easier).
I have a valve pedal that runs on 12VDC, but the ripcord doesn’t have enough power to power it. I think the limit is that Ripcord can provide 12Vdc at max 1A.
I also got this powerbank: