GreenLighting Solar Phone Charger - 2000mAh Window Cling Power Bank (Grey): This is one of the smartest chargers I've seen on the market. Compact capacity but with the option to recharge quickly with sunlight. What makes it even more convenient is that it could stick on to surfaces like glass, which makes it charging while traveling almost seamless. Definitely recommend for anyone wanting a solar-powered window charger for under a budget!
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