I've posted this elsewhere, but after the 3 hurricanes in a month during 2004, I did a debrief of my students (high school)... most had been without power and hot water for at least 7 days... right after the lack of hot water and a shower, the need to recharge electronics was their top priority, additionally the lack of cell phone coverage at about day 5 due to the loss of service by several providers (a lot of families did not have a traditional land line phone)...that is when I decided to convert to standardized batteries and appliances... then to rechargeable Sanyo Eneloops ...the 12v cigarette sockets and cables inclusion with my hurricane supplies was an outcome