I have a bunch these type of cordless/corded job site fans, and this one is particularly good. It puts out plenty of air for its size and being able to be powered by USB as well as two different Skil batteries is really versatile. I have used it with the 12v quite a bit, since I usually have some of those batteries with me, when I am working. I don't have too many Skil 20v tools but have also used it with the 20v 5ah batteries when I wanted more runtime. I use it most with the large capacity PD 100w powerbank I keep in my backpack. It really goes for a long time running on that thing. I also always have a way to plug it in because the spare phone charger I keep in the car can run it. There is generally not much that differentiates these fans from one another, but this one really stands out for sheer versatility. Good job, Skil.
Great fan for anyone that works in a hot shop. The battery last a long time. On full blast about 4hrs of battery life. I work in a body shop and having that fan on my toolbox is awesome.