Just wondering what you all have been using. I've been carrying a portable 18650 battery pack in my EDC bag for a few years now and have just finally upgraded to a dual USB one. It works on 1-4 18650 cells and charges with the same cable as my phone. With the current batteries it can charge my Galaxy Note 2 about 2 1/2 times before running dry, or I can pull a cell out and throw it in my flashlight, if needed. Gave the old one to my wife and she's already used it on her trip to charge her phone and Nexus 7. So who else has something, and what do you have?