Replacing smart button battery - help!

For the life of me, I can’t remember how to go about getting the replacement battery in the ST button to register. I remember having tons of trouble last time, and had to go back and forth with support for ages - unfortunately I’ve deleted all my emails!

I recall something about moving the small spring into the right position when putting the battery in - I’m trying everything but nothing. Any tips?

not sure about a spring, but the flat part of the button battery should go against the inside of the battery cover.

I tracked down a post I did on reddit where I figured it out but all I had wrote was that it had to go in on the right position so that the poles lined up - I wish I had put more detail! I’ve been trying the + symbol up, down, sideways - still nothing :frowning: