How much CFM do I actually need in a cordless leaf blower?

Across the reviewers we read, 550–650 CFM handles most suburban yards including wet and matted leaves, while 700+ CFM models are aimed at large lots or anyone replacing a gas backpack blower. Specialist communities consistently note that raw CFM matters more than headline MPH numbers for moving piles of leaves, and that very high-output 'turbo' modes drain batteries fast.