This is a remix of the https://www.thingiverse.com/thing:4848906 battery holder. It was stackable bottom up. It is also now attachable left/right. The linked lid is still compatible with theses objects.
the first tests showed weaknesses on the side fasteners. But if handled with care, they may not get stuck. For a later remix, feel free to keep a little more flexibility.

With_fastener is a second version with more robust fasteners