I made this case for my Celma WAK-12 cordless drill. It should be also suitable for older Makita drills.
Case fits 3x18650 Li-ion cell and PCM board.
Source file for Design Spark Mechanical included
Important: Bottom Cover.stl file looks little messy (not sure why), but everything looks fine after slicing in Cura. Fixed
Lock buttons should be print on the side for better flexibility which is important in this case.