I thought about designing it that way, but I was concerned that there would be some thin bits of plastic that could break when inserting and pulling out the DeWalt batteries. It does not fit into the original dyson battery holder. So, I just bypassed that and fed DeWalt battery power through a separate toggle switch to the vacuum. What I found a bit annoying is that Dyson uses a switch, that through some mechanical fanciness, eventually hits a button on the control board. Now I can use my beefy DeWalt batteries, which I haven't rigorously tested, but I am pretty sure last longer than the 17 minutes *cough 10 tops cough* that Dyson advertised for this vacuum. I just soldered on some wires and a switch to the dyson control board that directly feeds the motor of the vacuum and hot glued the 3D printed insert and DeWalt battery attachment with some wires with soldered on terminals. Anyhow, I find integrated battery packs a pain, so I made an original 3D printed insert (PETG on a Snapmaker A350) that fits the formfactor of the Dyson vacuum and uses a Dewalt battery adapter I found on thingverse ( ).

After disassembly, turned out to be a single cell, the rest are fine.

I have an old Dyson v6 whose battery pack went belly up.

Dewalt 60v battery adapter