Power outages are a concern down here due to hurricanes and floods. I've been without for 5 weeks. After 2 weeks I ran out of LP for the generator.
A small solar panel can charge your phone or e-cig. But more importantly the e-cig.
Screw the phone...gimme my nicotine! Now!
This is what I did. I picked up a Solar USB charger and keep a couple ego batteries around that can charge from it.