I used a Solio charger for my Newfoundland circumnavigation. It kept my radio and my phone charged and happy, even in the not-so-strong Newfoundland sun: http://www.rei.com/product/826629/solio-classic-2-solar-charger. That said it doesn't seem to work with my newer Blackberry...
The charger itself is not waterproof, so I had a pair of them in a clear waterproof aqua-pack on my aft deck. If you stay at a place with electricity, you can top off the Solio internal battery with a wall plug.
You can charge your phone at any time from the internal battery of the Solio. I did this at night in my tent. You DON'T have to keep your phone connected to the Solio while it is soaking up the sun.
If you are not in a wilderness area, I would just buy an extra battery and charge them when convenient.
YakCatcher Rod Holder
Bent Shaft Canoe Paddles
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