Used my fan on a 3 day hike. The first night it was charged with electricity. The fan ran from 7pm to 4:30am until it ran out of power. I also left the light on for about two hours. I was very impressed with that. The next day I left the fan in the sun with the solar panels on all day. The day was very sunny, not a cloud in the sky. During the night, the fan ran for two hours before the battery gave out. I'll try the fan again soon, but those are my conclusions for now.
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