GULAKI Portable Neck Fan, Personal Fan with 4000mAh Battery, Rechargeable Neck Fan with 3 Speeds and 64 Cool Lights, Birthday Gifts for Men Women Mom Dad, Hands Free Cooling fan for Summer(White)

We bought these Amazon cheapies for $23. https://www.amazon.com/dp/B0CWSJLX1G - No idea how they measure up to the rest of the market but the batteries have never failed us and a year later they are still working fine.