Prepper's Long-Term Survival Guide: Food, Shelter, Security, Off-the-Grid Power and More Life-Saving Strategies for Self-Sufficient Living by Jim Cobb,http://www.amazon.com/dp/1612432735/ref=cm_sw_r_pi_dp_FMNktb1VZE2JE7HB
How to Charge Your Phone With a 9V Battery - I have many of these batteries just laying around. I haven’t needed a 9v battery in years. This works well (I just tried it) my new iPhone 6 plus went from 2% to 11% in 16 mins. Not to shabby, huh?