Report Flexvolt with 20v blower? in Dewalt Posted June 2 I had your exact same situation. What I found is the 9ah will actually fit in the blower although it's tight and takes a little flexing but it does go. I think it's just a design oversight and I've never had any issues running the blower with the 9ah. Then again I'm just a homeowner that uses the blower to clean up my driveway, sidewalk and patio so I'm not draining a battery in a single use.