1. Charge your phone on the way to the loo
Some airports have charging stations in public areas, and those airports are buildings of wondrous joy. Most airports don't care whether or not you need to charge devices mid-journey, unless you're one of the lucky ones with lounge access, in which case life is wonderful wherever you are. When you're desperate for a quick charge, you're more likely to find unguarded plug sockets in those long halls on the way to the loo than you are anywhere else. Just travel with a universal plug adaptor in your hand
luggage and you'll be fine. Or fly Emirates, which has USB connections in every seat, enabling you to charge your phone as you fly. I love Emirates.