If your phone ends up dying in the middle of the day you've got 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 packet of Extras (or Bubblicious if you're feeling maverick), then you've got no reason not to keep a portable charger close at hand.
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 2,600 mAh, which is more than enough to completely recharge the iPhone 6's 1,810 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.
UK pricing is yet to be announced, but at just $30 in the US, it should be bite-size, too. [Goal Zero]