Disable Eject key on battery or bluetooth Mac k...

Much discussion on this on the web and this appears to be the only solution that actually works, albeit lo-tech.

I used Karibiner Elements to assign my F6 key to function as Eject. This works great, but it won't actually disable the "real" Eject key.
For that, I cut a piece of sheet tin and made this handy cover. Problem solved! No more accidentally hitting the Eject key while trying to delete!