End your search for accessible outlets in public places. Incase has released two Portable Power packs ( 5,400mAH and 2,500mAH ). Once charged, the Portable Power quickly transfers power to your USB-chargeable device, indicating charge progress with a series of LED lights, and with enough capacity to recharge an iPhone twice.
The Portable Power 5400 is available for $80 here
The Portable Power 2500 is available for $60 here