The adapter fits well. all items in the kit are good quality, But the 2 AH battery's don't hold much juice, they are probably fine for a homeowner, but If you're using them all day you will be disappointed (lots of trips to the charger) The 2 AH batteries don't hold as much charge as the 5 year old 18 volt batteries I was trying to replace, the adapter might work better with bigger batteries.