GAOHOU Battery Cover Back for Apple Mac Wireless Bluetooth Magic Mouse A1296 MB829LL A Series

This fitted the mouse ideally, however I experienced multiple disconnections from the Mac. Although this is a computer that I only use occasionally, it was still frustrating that it didn't maintain connection. Eventually, I started to gently bend the cover which sorted out the connection problems. I suspect that the cover was bulging away from the mouse preventing the beam from reaching the table surface, adding a slight concave bend was the solution.

Not happy batteries fall out

Did not fit my Mouse properly