So I have my 2 batteries. Now I need to start measuring them up.

One of the batteries is dead, it will not hold any reasonable charge to do any work. I intent to use the top half of this one to get the mating dimensions to fit into the drill.

As you can see, its been mauled by a screwdriver and god knows what I used to pry this thing open. All the more reason to generate models to create spares.

So far I have this in RS Design Spark...

...its a start