BlitzWolf® 15W 2A Foldable Portable Dual USB SunPower Solar Cell Panel Charger with Power3S
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True power rating. This panel can easily charge any smartphone and will also charge in overcast conditions as well (with decreased rate of course).
Pair it with LiitoKala Lii-100 0.5A/1A Li-ion Ni-MH USB Battery Charger for example and you can have independent power source for your flashlight needs 
