Fairphones are known for having removable batteries (the 6 requires a tool, unlike previous models, but still).
A repairable Portable power bank (where you can change the battery and perhaps the USB-C port) would be a plus in today’s market, which doesn’t offer this kind of repair. The thickness doesn’t really matter (I’m not saying the battery should be 60cm thick, but generally speaking, you don’t buy a Fairphone for its slimness).
The fact that it’s repairable, combined with the use of sustainably sourced materials, would be a selling point in a market where, after a few years, you have to throw away your power bank because it’s becoming less and less effective.
I’m obviously available to discuss this further if needed.
Thanks again, Fairphone, for what you’re doing.
Cheers 8/