Watch cases are opened with multiple size, strength, and thickness blades, or by a screwback tool.
Many modern watch cases that are "snap" cases are such a tight fit that I recommend you see a Certified Master Horologist who has a crystal press to make sure that the case goes back together properly. Also, if the watch is worn in water, you will want to make sure that it is pressure tested so that the movement is not ruined by exposure to the water.
Some cases now fit so tightly that special tool and mallet must be used with direct force to open the case.
I recommend Energizer batteries only, since I have never seen them leak in a movement.
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