I had no luck running a powerbank with my 6 or 7, they kept resetting, but that was possibly my set up at fault as I know others do run powerbanks to them. I run a Hero 5 Session with a powerbank though, and I velcro it to the back of my helmet. You could put it in a pocket, but then you'd be attached to your mic adaptor and movement could cause issues when you turn your head etc
I've got a powerbank stuck to the back of my helmet plugged into a Hero7. If I just unplug and replug the GoPro each time I turn it on to record, then I don't have any problems. I still will occasionally look at it in my mirror to make sure it's still charging. I have my battery sitting in a housing that I glued to my helmet, but if I were to do it again I would just use velcro to directly attach the battery to the helmet.
Edit: I don't use the GoPro mic adapter though, so it's possible that's why I don't have problems. I know there are people using a powerbank with the mic adapter though.
Im running a powerbank in my jacket, I've routed the cable very nicely so that I can move my head easily but the cable is still tight. Its a bit of a mission to get right, but doesnt move while riding.
I had never heard of sticking a powerbank to your helmet
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