Because you'll be Instagramming up a storm all weekend, that iPhone is going to need an extra boost. There are a lot of battery cases on the market, but Boostcase's Hybrid Power accessory ($100) offers more flexibility with a two-piece design. Once you're done charging, lose the bulk and detach the battery sleeve with one motion.
It holds six hours of extra talk time, 40 hours of music time, and 10 hours of video playback.
— Nicole Nguyen, assistant editor