I had issues when I changed the battery as well.
Don't know what fixed it but I remember resetting it a couple of times and readdding it and also making sure smarthings and smartthingds find was updated.
Can be pretty frustrating if things don't work as they used to.
[img]https://eu.community.samsung.com/t5/image/serverpage/image-id/3557680i4CEEB55A1BCE4D9B/is-moderation-mode/true/image-dimensions/2000?v=v2&px=-1[img]