I give this fan 5 stars. It blows very very hard and the battery will last about 3 hours on high. Very high quality fan. We use it for outside sports. We also purchased the 12 in fan prior to this one and loved it so much we had to have the bigger one. I have to say the 12 inch battery does last a lot longer than the 16 in. It lasted us one day for about 8 hours working outside. We love both of them!