Fantastic fan with a big battery, I bought this one last year and it might be handy for those wanting to prepare for the heat.
This one is 6000mAh unlike most fans which are 4000mah so lots of runtime if you need it. Also has protected fan blades to make this a bit more durable. It isn't the quietest fan in the world but it has lots of speed and lasts forever. Easy to leave on a night table or on a desk if you need it.
5 Gear Turbo Wind: JISULIFE Portable Fan Upgraded 5 gear turbo wind for potent cooling. You just simply press the power button to change the wind setting, short press to cycle switch low-speed (3300r/m) to high-speed (6100r/m), and long-press at any gear to turn it off
23H Max Cooling Time: JISULIFE Handheld Fan comes with a 6000mAh rechargeable battery, has a long-lasting battery life, which can provide 5-23 hrs duration (depending on speeds). Fully charged in 4 hours using a device with USB port, you can enjoy coolness all day without worry
Powerful & Energy-efficient: JISULIFE Personal Fan features a high-performance motor and optimized air duct to improve wind power while minimizing noise. Compared to other hand held fan, it has a faster speed (6100 r/min) and stronger wind (4.8m/s)
There's also the 4000mAh on sale for $17.99
Got one of these last year. I used it twice.