The Analog Four does not work with the ripcord USB 5V to DC 12V cable. It switches on but no sound. I guess you knew that already 
The A4 PSU is 2.5A, the ripcord delivers up to 2.4A. But maybe thereās more to that like different types of DC like real DC and switched DC.
mine works with my 12v ripcord, and doesnāt work with my birdcord š¤·
Oh, hope at last, will try the other ripcord cable then and another battery back. 
Do you have A4 mk1 or mk2?
What battery do you have?
Personally, I wouldnāt use a 5-12v cable now that batteries and adaptor cables that do PD exist.
mk1.
tbh I reckon itās my powerbank causes the issues. dt2 works with birdcord, A4 mk1 used to work with my birdcord but doesnāt now, ripcord works with it tho. rytm mk2 doesnāt work with ripcord. no idea whatās goin on lol.
Your powerbank specs look right to me. Iād expect that to work with the birdcord for all your Elektrons. Weird that it doesnāt.
yea weird. itās quite new too. only a handful of power cycles. could be an issue with the birdcord 
Possibly. Itās one of the little āPD 12vā adaptors, yeah?
Possibly also the battery is lying about its power ratings. I only have experience with a couple of batteries, and not encountered the problem you have so Iām guessing from this point.
yea usbC pd12 mini birdcord thingy
Gotcha. Mine has worked fine with AR, OT, A4, Syntakt. Iāve seen very few, or zero, bad reports of them on here (I donāt hang out in many other places online). So my trust goes to Birdcord initially. Contrast with Ripcord extenders and step-up cables, which seem to have a 50/50 hit rate (taking a casual average from comments on here, plus my own experience with them).
I have that one (edit: a very similar one), too. Didnāt work. Even tried 65W power adapter with USB (for charging Mac), didnāt work. The battery in the video has 3A output.
But given the fact that you got A4 mk1 working with battery packs, I will try further.
Could you elaborate on that? 
You mean sth. like this?
~~https://amzn.eu/d/0j7QXgbW~~
Edit: read about birdcord and PD voltage conversion in powerbank. Nice concept. Going to order one. Thanks a lot
Cool.
Yeah, the pre-PD way was to have either:
But if you have the step-up cable, you need a power supply/battery that will also up its power output, so the transformed voltage could also pull the same amperage. And most of them donāt do that; so most of those battery + 5v-12v cable solutions donāt work. The voltage would match, but the supply couldnāt deliver any more power so the amperage dropped.
With PD, the device you want to power (like a groovebox or a torch or whatever) ātellsā the power supply what voltage it wants (or you use an adaptor like the Birdcord PD-12V that does this on behalf of devices which donāt already have PD), and the power supply does the dance with watts and amps to match automatically.
(someone who understands it better can tell me where Iām going wrong)
So today, I just wouldnāt bother messing with anything other than a PD source and a device or adaptor to go with it because the protocol will just make everything work without me having to think too hard about it. And Iām lazy and donāt like thinking too hard.
You do need a battery/power supply that supports the voltage you need. Anker brand typically donāt support the 12v that Elektrons need.
You need theseā¦
https://myvolts.com/StepUpPower
works great, AR/A4 draws between 15-20 W each
old ripcords are OFFICIALLY not strong enough for AR/A4
A bunch. Among them this one, which explains itself on the back: 12V only 1.5A 
(Really only similar, def not the same as the one of @pidgeo
(However, the ripcord also didnāt work with the 65W power outlet as it shouldnāt officially as stated above)
Will see if I can find a shipping address here for the birdcord.
Probably not enough to get the Rytm through boot-up.
looks interesting - shame it gets in the way of the USB in its neatest orientation
so clearly this works (anecdotally), but if i was buying iād probably check with maker that thereās a typo or whether there are 2.5mm variants, it may just be an error on this page
Then it raises a question about whether it would be reliably engaged with a 2.1mm pin on e.g. a Behringer Analog ā¦ itās possible to use this way (anecdotally), but it canāt be quite as reliable as the correct snug fit barrel
but a 2.1mm barrel will not work with a 2.5mm pin !
edit : this seems conclusive, but it raises the issue of 2.1mm devices and or ordering the correct one - just be aware it may not be a solution for multiple devices (without an adaptor)
