Voltcraft has this charger: https://www.conrad.com/en/p/voltcraft-button-cell-charger-li-ion-rechargeable-button-cell-200520.html

And these batteries:
https://www.conrad.com/en/p/voltcraft-button-cell-rechargeable-ml-2032-lithium-65-mah-3-v-1-pc-s-2542815.html

Same brand, must work, right?

Guess what? Doesn't work! As many of the reviewers pointed out over the years.