@r_esben I can confirm as well. I have now 3 dead buttons from the very first batch some years back. They seem to get stuck somewhere. I imagine some electronics broke down and is now not able to restart after the shaky battery change. As an electronics engineer i always feel bad when replacing the battery as the connection is going on and off and on and off and on, until I finally have the flic attached again to its base. Maybe this is something the aged buttons don't like anymore?
Any recommendations on how to replace the battery in one go without the shaky connections inbetween?