The Best Batteries for Pokemon Go

Pokemon Go is an absolute blast, but it can drain your phone's battery like a rampaging Electabuzz. If you want to go out on an all-day Poke-venture, you're going to need to keep charged, so we've rounded a bevy of portable smartphone batteries that'll have your phone humming like handful of happy Voltorbs.
Before we dish out the recommendations, here's what you should know about buying a smartphone battery: First, battery capacity is measured in milliampere-hours, or mAh. The iPhone 6