Mater's Workshop.. I knew that fan wouldn't go for 60 hours on one battery.. My Ryobi fan used 4 batteries for 2 days and then I had to recharge them but I didn't use them very long because I decided to use the corded fan running off of the generator Instead of having to recharge the batteries again. With that being said though, I did not have four 4ah batteries. I only had one 4ah battery, one 1.5ah battery and two 1.3ah batteries. So I guess I will stick with Ryobi.. I didn't really want to get into another battery line anyway. Ryobi, Flex and Milwaukee is enough. LOL
