2 ms·

4.9oz or .139 kg: https://www.amazon.com/LightSaver-Roll-up-Solar-Charger-Battery/dp/B016N2NMBC/ref=lp_3039010011_1_3?srs=3039010011&ie=UTF8&qid=1490118799&sr=8

4.9oz or .139 kg: https://www.amazon.com/LightSaver-Roll-up-Solar-Charger-Battery/dp/B016N2NMBC/ref=lp_3039010011_1_3?srs=3039010011&ie=UTF8&qid=1490118799&sr=8-3 https://www.amazon.com/LightSaver-Roll-up-Solar-Charger-Batt... Works well on sunny days if you adjust it to point directly at the sun, and it charges in 6-8 hours.

parametrek 9y ago
While that is extremely light, it still weighs as much as 3x18650. Breakeven point would be after four days of perfect 100% utilization of solar power. Is it practical even then? I'd gladly carry a few extra batteries so that I don't have to sit around camp and keep adjusting the panel every hour. $100 isn't practical for most people either.