The specs say 91 CFM (cubic feet per minute) and "Up to 12 minutes of continuous operation from a single charge at high speed." That is 1092ft³ per charge. What is the internal volume of "a big raft"?
From NRS's chat:
[tmaggert] Can you tell me the approximate volume of air that a 16' Expedition raft holds?
[Kurtis] Hello, welcome to NRS. My name is Kurtis.
[tmaggert] Hey Kurtis!
[Kurtis] This is not a spec we have easy access to, unfortunately. Why do you want to know?
[tmaggert] I am trying to figure out if a battery powered leaf blower can fill it. It can do 1000ft³ per charge.
[Kurtis] The pressure is probably going to be the main concern. Will it be able to fill to 2.5 psi?
[tmaggert] Not entirely sure. It might need topping off with a K-pump or similar.
[Kurtis] Should be fine as I did a quick estimate on the perimeter tubes at about 95 cubic ft.
[Kurtis] The floor should be another 25 cubic ft - ish.
With a 20% fudge factor, seems like you may be able to do 7.5 "big" rafts.