Check model year - child-safe battery cap - Holosun Military Grade Micro 1x22mm Red Dot Sight

Recent change to the Holosun lineup of optics features the use of Child-Safety features for the battery cap.
i.e. the can has a plastic ring on the outer edge of the cap that spins freely, meaning you cannot replace the battery without use of a tool.

The concept of a child-safe battery cap on the optic of a FIREARM is absurd. If you are concerned about an unsupervised child getting into the battery of your red dot, then many other failures led to that point and the battery should probably be the least concern.
This may have been a quick-fix to appeal to legal pressure, but it removed one of the key features I was looking for in this optic.
Namely being able to swap the battery tooless. Thus, I returned the one I ordered.

The rest of the red dot is the same, and thus quite good.
But the cap thing is very upsetting.
Search out an older model year if you are interested in this. Or maybe see if you can source an old cap first.