Is an inactive Magic Mouse repairable?

"Thats a good sign ;-}

Try using a pencil eraser to clean the corrosion and/or non conductive film that has built up on the contacts.

A cotton swab slightly moist with white vinegar can also clean up any crust from your alkaline batteries. Be sure to wipe down the area afterwards with some cotton swabs moistened with straight water (not to wet) to clean off the vinegar afterwards."

I cleaned it with a cotton swab and vinegar then just water and dried it worked at the first try :D

Changing from duracell batteries to energizer is the only difference in making the mouse I have work again.

If you use a nail file gently it should work. Make sure the contact point is smooth and cleaned off. I used the cotton swab at first with alcohol and it didn’t work.

Pencil eraser 3 times worked here as well.

I also discovered that I have some batteries with non-standard plus terminal heights. If the plus terminal heights are too short, they won’t work with the Magic Mouse.