Q: how to remove the battery cover on the wireless mouse?

At the end opposite the LED sensor there is a black plastic bar.  Using your thumbnail pull the bar away from the sensor and the cover will come off.  Refitting is the reverse.

Hmmmm...... yes, in theory.  But, like othe people apparently, I do not find that this happens as easily as you imply.  Broken nails, swearing and throwing the mouse at the desk (literally) are what follows!  It seems very out of character for Apple to have let such a bad piece of design get through.  My mouse is frequently just stopping working entirely now.  I guess I'm going to have to invest in a new one.  It's no doubt the result of my deliberatly dropping it so many times, just so it'll burst open.

Big Fail Apple!

thanks very much for your suggestion, but I'm giving up on the mouse entirely and have ordered a trackpad!  That'll be a relief.....

Cheers

Davy

While this is marked answered, the answer didn't help me.

I found that I had to use this process:

1. Hold mouse in left hand with black tab at bottom.
2. Insert right thumbnail in slot on "up" side of black tab as held; i.e., the side towards center of mouse.
3. Push in and down.  This will release the cover but typically not completely.  YMMV.
4. Place thumbnail on top of black tab and push down as you slide thumbnail down towards bottom of mouse.  Thumbnail will catch the edge of the opening at "bottom" of black tab and pull the cover off.

Replacing the cover is only a matter of inserting the top edge and then pushing the cover down into place below the black tab.

There are variations, Rod.   I answered this question a few days ago to the satisfaction of one poster ... not using the thumb but the forefinger.   The principle was similar to yours.

My Magic Mouse battery cover will not release and come off as it is supposed to?

Incidentally, this thread is more than three years old.

I know it is over three years old.  Doesn't change the fact that people continue to have issues with this -- which is why I replied to this thread as people continue to search for this issue.  My reply was added as much for me as anyone else as I continued to run into this during my now-monthly battery change.

BTW: My intent was not to specify a particular nail to be used but a method.  I expect the reader will be able to improvise with a preferred nail or hand to use.

And you hit the nail on the head when you say people continue to have issues. 

They continue to have issues because they don't follow what Apple ask people to do; that is read up about their problem before they ask in an Apple discussion.    In most cases. if you 'Google' your question the answer will appear, either as part of an Apple discussion or via a third party.   The value of doing this is that it prevents the same old questions continually appearing.

If you feel this particular matter needs addressing I will write a user tip to cover it.

Your point is well taken.  Except that I indeed do google -- it is part of my regular process -- and the answers I found did not fix my specific situation.    I did see your response in the other thread.  And I did view the formal instructions on the Apple site which essentially all the say the same thing: Push the black button.  However, you'll  note in my steps the need for a second press of the black button.  In my experience, I have only on rare occasion had the black button work the first time which has always led to my confusion and frustration:  Why did it work that time and almost no other time?  Having to do this monthly (which is another annoyance, but I digress) just adds to the frustration.

This time, after investing some time to figure exactly what works every time for me, I added my response.  Because It takes one press to release the cover's tab from under the black button, and another press to allow the cover to slip over the black button.  It is never (nearly so) a single press of the button for me.  That may not apply to everyone and I'm happy if there are those who can do it in one press and the cover magically comes off.  That has rarely been the case for me and I expected there may be others who have the same experience.  IMHO, the design of the mechanism is faulty.

I still can't get this to work reliably. Absolutely agree that this is a design flaw.

I can't open mine either. I'll stop by apple shop and campus and buy something else.

I do hope you are not trying to open a new magic mouse 2.   Anything bought this year is almost certain to be the 2 version that must be charged directly.   I mention it just in case.