thanks Klap,
so this birdcord is the one?
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Yup, thats it! Heh, maybe order two because they’re small and I could see it getting lost pretty easy if you’re not on top of it.
I haven’t lost mine yet but I’m obsessive about making sure it goes back into the same place every time I’m not using it lol
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deadly, nice one 
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Using the set ups you folks are describing, about how much use time do you get on an OTT track Mk2?
There are powerbanks with a DC output allowing 12V out (I think the OT MK1 is a weirdo with something like 13V) which will be a far better option IMHO rather than some sort of converter cord.
I just bought an XT Power 26.600mAH which IIRC is the max allowed in an aircraft. Selectable output voltages, USB-C, DC output/input and USB A, 550g and compact, should do the job.
Just remember Higher Voltage = Burnt device and Under power Amps = Device won’t work properly or even switch on.