We're using a neck fan.

https://imgur.com/a/q8zT2AM - it has a short white cord that we leave have plugged into the USB in the back, so we never have to worry about charging.

It's this one: https://smile.amazon.com/gp/product/B085VRBKJT/ref=ppx_yo_dt_b_asin_title_o02_s01?ie=UTF8&psc=1