Just got these little fans today so can't comment on battery life. I'll update my review once I get a chance to use it more. My first observations so far are that the fan creates a nice breeze wherever I probably want it. Smooth speed control. I haven't tried scents, but soaking the foam inserts in water seems to add some moisture to the airflow, which can cool things down a bit in dry locations. It only fits flat top 18650 lithium batteries so I can't use any of the batteries I already have in my collection as they are different types. I understand that charging external devices will likely require flat top batteries (no current limit), but it would be nice if you could carry multiple charged sets of each type and swap out as needed. I probably won't use the loading function. If the battery trays were a bit longer with longer spring clips then any type of battery in a pinch would fit.
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