Earlier quoted context omitted.
Continuing to take photos with a battery pack hanging off a device is no where near as simple as popping in a fresh 100% battery and coninuing as normal.
These don't dangle or impede your use: https://www.anker.com/products/a1665-5k-ultra-slim-qi2-power...
I would still prefer replaceable batteries back though, and you really dont need to convince me otherwise!