Porter-Cable 20V battery holder
thingiverse
I "remixed" this design with a combination of measurements of the part I printed (which was overspecified, too snug, and now in the garbage) and measurements of my 20V battery. It's possible that an 18V battery might also fit. Let me know if it does. The OpenSCAD source is included so you can make your own changes if you want. The pictured item is the N-1th design iteration. Needed a bit of cutouts, which are included in the design.
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