Newegg with 47th Street Photo has the Opteka BP-SC4000 4000mAh Battery Solar Charger for $27 with free shipping. Features solar or USB power, LED power capacity display, auto-shutoff after charging, and includes 10 charging tips.
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Amazon has it for the same price but the reviews are sketchy. I decided to pass.
Most of these require hours in desert bright sunshine to fully charge. USB charge the most reliable way to do it.
^ sure but in 18 days your USB charge options will be numbered.
The battery will melt first after hours of bright hot sunshine charging