Up to 15 years is what they say. That is probably a very optimistic estimate, but I would not be surprised that it could do standby for a very long time on a single Lion AA cell, as there is no screen.

Solar and kinetic charging are bulky and cumbersome. At this price point they would probably be shoddy and unreliable.

I tried a $20 solar USB battery pack combo device and it was pathetic. There are more expensive options that would probably work better. Not all emergencies are during the day or near powerful light sources.

The Ampy Move is $100 and doesn't work.

http://www.cnet.com/products/ampy-move/

I don't know if you're a shill for the Ampy company, but you've dedicated yourself in this thread to paint a utterly unrealistic and false idea of the effectiveness of the Ampy Move gimmick. The device doesn't work for its intended purposes, apparently their makers bend over backwards to paint the product in a rosy picture, no one buys it, and a cheap dollar-store charger is more efficient and effective than the ampy gimmick.

I keep a charging "brick" in my car, and just top it up every month. In an emergency, I could charge my phone/tablet about a half dozen times. I figure that's a lot more useful to me in a genuine emergency I'm likely to experience, than this toy.