I personally don't consider buying a battery case because an external portable powerbank seems easier to use. So, the market has indeed spoken: you can buy the

I personally don't consider buying a battery case because an external portable powerbank seems easier to use. So, the market has indeed spoken: you can buy these powerbanks on every corner, which indicates a demand for increased battery capacity. Perhaps not in the form of a battery case, which only works with one device, though.