PowerFilm is a rollable solar power battery charger. Keep it with you and you can power all your gadgets, your 12V power systems or a lot of different batteries (except it rains 
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They’re made by Iowa Thin Film Technologies and are available in three sizes with varying power outputs. The largest, at 12 x 73-inches, will put out 1.2 Amps and only weighs 1.9 pounds. Available connectors include cigarette lighter, battery chargers, and daisy chain connectors. Prices start at about $150.