Putting a tiny kink into the metal dome worked perfectly. And I already had a roll of Kapton tape on hand. I never would've realized the little dome was only held on by the tape if not for this guide. Just figured the tape was there to prevent shorting on top or something. That thought made little sense once I saw a bunch of these buttons available and designed without tape but a metal case instead.

Thank you. Mine had all the symptoms of a bad battery not holding a charge anymore. Doing the manual reset proved that wrong. I would have found out the battery was fine when testing it after removing it from the unit, which would’ve meant a lot of wasted time. :)