The original model by FruitieX was great but I found that my Amazon Basics AAA and AA batteries didn't fit so I changed the couple battery size parameters in the Fusion file to get the fit right. Posting both the inserts and the base, I'm reasonably certain that only the inserts were updated but just in-case I'm including the base too.
Print Settings:
Use whatever works for you for standard prints. I printed mine in Filaments dot ca Econofil Black at 0.2 layer height and 10% infill. Worked fine.
The author remixed this model.