This is my first Gridfinity design. After printing the gridfinity 1x2 D battery block by BenBreaksThings I was looking for a similar holder for some C sized batteries. 

Designed the model in Autodesk Fusion 360, following the sizing from https://gridfinity.xyz/specification/ and the original Divider Bins parametric source file from ZackFreedman https://a360.co/3vbu9B5

Printed in PLA. 0.2mm layer height. 15% infill.

----

16-Aug-2023 - Added v5 with increased hole size

Based on feedback I've uploaded a new version (v5) that increases the diameter of the holes to 26.2mm which is the standard for C batteries (according to Wikipedia).  

The original upload (v3) is still included which was based on the measured diameter of 25.5mm and works great for me (snug fit) for multiple brands of battery, but your mileage may vary based on battery brand, printer tolerances, and filament. 

The included Autodesk Fusion 360 model has been updated with parameters to set the diameter and an optional tolerance.

If you're concerned about fit, try a test print by dropping the model down into the bed of the slicer and slice/print a few layers of the middle of the model.