If that's a "wall wart" and has a little coaxial plug that plugs into the handle of the drill, I suspect there's a rectifier in the drill itself.
5.5 VAC wall wart shouldn't be hard to find. 5v is very common and might work.
5.5 VAC wall wart shouldn't be hard to find. 5v is very common and might work.


This is what happens when engineers have to much free time.
It hung on the wall in my workspace and now hangs on the wall in my garage, just so all the machinery there in knows the score...