There you are, waiting at the bar for your friends at the end of the long day.  Are they here yet?  They will text when they get here.  One problem.  Your phone has just dropped into the barberpole battery.  You have maybe 5 minutes left and then your friends won't be able to find you.  What do you do?

From your pocket you pull out this handy little battery.  Plug your USB cable into the USB out port and into your phone.  It will give you about another hour or two.  Power will transfer from the battery to your phone and then you can unplug it and put it away.

http://amzn.com/B002FU6KF2