The earliest digital photo of mine I can find is from 2008. Except for the first couple of years, I have always had off brand batteries as back up. Three or four batteries have eventually failed to perform over the years, including one Nikon Brand. Not one battery failure has harmed a camera. A dozen years or more of significant camera use without incident. There are always horror stories, but few in the first person mode.
I understand, but I'm not go to trust my brand new Z fc to an off brand battery that has been untested in this camera by other owners, especially from a company I've never heard of. As small as the odds may be, I don't want my camera to be one of the few horror stories.