DieHard battery cover

This is a battery cover for a 19.2V DieHard rechargable battery for the line of power tools. The contacts of the DieHard battery are recessed, so this isn't as necessary as for the Ryobi from which I remixed this. But I think a cover might keep gunk from getting in.
I designed this for my father-in-law; he has Sears power tools that I think are the DieHard 19.2V series. (I happened to find this battery in the recycling bin at my local Lowe's; it was convenient to have an actual battery to test