Originally Posted by Sh1tbag OToole
Interesting but I see a flaw in their design. Exposed blades like to hit off rocks in shallow water, plastic blades won't last long. In practice a lot of these things like the solar chargers with a big li-ion battery are charged on the mains with a little top up now and then from the renewable source followed by it's owner waxing lyrical about "Oh! Look I used some real treehugger-approved power to charge my iPhone 7"
They have thought of that - there is a clip on ring that goes around the blades to protect them in shallow water.
But can't ever imagine it would be a bargain.
Edit> The problem for me would be why carry two batteries, the one in your device and the one in the charger? All takes too much time with charging the units own battery and then charging the device you want to use. Weight wise you could carry a solar charger that was 4-5 times the output for the same weight.
However if you plan camping by a fast moving river every night then its use gets a little more appealing.