Just as I was boarding my most recent flight to Denver, I noticed the battery on my smart phone was getting low.  No problem, I thought.  It's only a two hour flight, right?   Unfortunately, before that two hour flight, we ended up sitting on the runway for 4 hours. It turned out that my phone died before we were even in the air.  No music to calm my flight-jittery nerves.  How frustrating!  If you're like me and you find that the ever increasing use of your electronic devices equals a constant search for the closest outlet, take a look at this article where writer Zach Epstein shares 15 tips for squeezing as much battery life as possible out of your iPhone.  phone