Gotta catch ’em all!
As a pokémon trainer you know the hard work and effort it takes to find all the pokémons. Not only does it take you out in the world for long treks, but suddenly you find yourself a long way from home with only 10% battery left on your phone. Do you want to prioritise which ones to catch, or focus on catching pokémons or getting items from pokestops?
With a power bank as a backup you don’t have to miss out on any of it. Not only do you get more battery time for your phone, but you get the authentic experience of actually having a pokéball with you.