I am using my friends iMac at this moment, and I get a message “Mouse Batteries Very Low – Replace or recharge the batteries soon.”. So I turned this Magic Mouse upside-down and now it turns out that the bottom side is different from my own Magic Mouse… I can’t find the lid to open the Magic Mouse and get the empty batteries out…
What is wrong ?
The Magic Mouse you have yourself is a 1st generation Magic Mouse that does have a battery compartment with normal AA-type (rechargeable) batteries in it.
The Magic Mouse you are holding now is a Magic Mouse 2 (2nd generation) that has a rechargeable battery pack built-in. There is no battery compartment you can open, there is no lid. You just have to take out the Lighting cable from the iMac-keyboard (or get a Lightning-cable equipped USB-charger from your iPhone or iPad) and plug it into the small oblong hole in the bottom of the Mighty Mouse 2 and it’ll start recharging.