When my phone battery runs low (reaches the 15% threshold where it auto-engages battery saving mode) I get two identical battery low notifications from KDE Connect for my phone.
Probably resolved with https://cgit.kde.org/kdeconnect-kde.git/commit/?id=22d14de01828d1a65a003572317ed817b7b0364a Please test and confirm.
Assumed fixed, reopen otherwise.