If you have some old battery powered drill that uses a battery that is unavailable or to expensive you can convert the drill to RC-lipo. I am not going to explain every step but you have to cut off most of the drill-handle and the cut-profile of the handle must be approximately of what’s in the images & stl file. Then the idea is that you glue on the new battery box with super glue. The original file is for a Hitachi DS12DVF (49.5x33.5 handle) but your drill may have different dimensions, use y&z scale in cura to add the percent to fit your dimension. I recommend 100% fill density and support everywhere.Some tips: If unsure on the dimension on the handle part, you can print a test of only that part, turn off support and turn it 90 degres in cura (with the handle down) abort the print after some millimeters and see how it fits the drill. The plug that connects the battery with the drill will easily steal loots off unnecessary space. This part you have to modify for yourself (Only a problem if you have a very big battery)