If your phone ends up dying in the middle of the day, you have no one to blame but yourself. You want a giant bright screen? It's going to cost you in battery life. And with Goal Zero's upcoming Flip 10 charger, if you've got room in your pockets for a pack of Juicy Fruit (or at least Bubblicious), then you have no reason not to keep a portable charger close at hand.
For just $US30 it comes with its own flip-out USB connector for charging itself in about two-and-a-half hours, and a separate USB port for connecting the charging cable of your smartphone of choice. Its own battery is rated at 2600 mAh, which is more than enough to completely recharge the iPhone 6's 1810 mAh battery. And when daisy-chained to a laptop, the Flip 10's onboard electronics allow both the portable charger and a connected smartphone to charge at the same time. [Goal Zero]