Wyze scale stopped working...but now okay

My Wyze scale, purchased April 2020, suddenly stopped working recently. I thought maybe batteries, so I swapped out the old ones for new, but still nothing. Since it was out of warranty, I went ahead an ordered a new one (via Amazon, for same day delivery), and decided to see what could be salvaged from the old one. I pulled the batteries and took a look in the battery compartment, removed the two screws, and tried carefully prying the unit apart. That didn’t work, so I checked with a magnifying glass for anything else that might be holding it together. That’s when I noticed a very slight hazing on one of the negative spring contacts. I used some vinegar to clean it up, put everything back in place, and it works again!
I’m VERY surprised that a very tiny bit of battery corrosion, which didn’t show up on the old battery at all, and was only visible under magnification, would cause the scale to stop working. But I’m very happy to find it working again now, and I will keep a close eye on batteries from now on! Oh, and I will keep the new one as backup, just in case.

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Exactly what happened to me as well, except for attempting to disassemble.
Swapped out batteries, checking the voltage on all the batteries. No on switch, no reset button… I got on the net and found your post. I couldn’t find any corrosion on dead batteries or terminals, even with a lighted 4X magnifying lens, but I was hopeful and wiped down all the metal contacts with vinegar.
Voila, My scale works again.

Thanks very much