The Scotty Solar Charger. Dude, you’ve got a belt. You need something to clip onto it. A personal solar charger. With a 20 year cell life. Yes you do. £34.99. More here.
Scotty uses a pair of Ni-Cd battery cells as a power reservoir and is the essential compact charger for people on the move. The unit features a charging indicator on the reverse, and the quicker this LED flashes, the fuller the batteries are charged…The Scotty is charged fully in 7 hours of sunlight, and this can be as little as 5 hours if the Scotty is used regularly.