This Poké Ball-shaped battery pack that I found at one obscure Chinese booth at tech show IFA 2016, however, might be the coolest battery pack I've ever seen. It's perfect for Pokémon Go addicts.
The one I checked out has 12,000 mAh, which is e**ugh to charge an iPhone 6S a little more than six times. That's plenty of power for playing Pokémon Go all day.