Measure the diameter and length of the battery,

change the parameters and you are done!

Try not to modify other parameters.

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测量电池直径和长度，

更改参数就得到了。

不用更改其它参数。

This is inspired by the military "M13 Link" or "M27 Link", which I have heard some authors have modelled, but haven't seen.

As the batteries are slightly different in size, the difference may make it impossible to clamp the battery securely.

I found the Openscad challenging, the parametric design is perfect for adapting the holder to the size of the battery. 
Using Openscad is indeed a "challenge" for me as I am not very good at writing codes.

It's particularly feel bad when trying to add rounded corners to a model

(FUSION360 could have made the model more aesthetically pleasing, or even added voids for visual appeal).

In the end, this inelegant and completely unsophisticated code works!

But at the end of the day, this Openscad code can run and produce the specified model.

(Really spaghetti code, I don't want to read these code at all.)

The failure to apply rounded corners to the center section results in an unexpected state:

it can almost become a "ammo strip", instead of bending softly.

With two or four batteries, you can snap it like this:

Three and six can be combined to make a triangle:

But at least this inspiration has been turned into a product that can actually be used.

Of course, you can try to extend its use:
For example, make some containers for your own pens and have them linked.

Thank you for your support.