So I went home and tried the second key and it worked fine. I checked the new cell with a battery tester and it tested fine as well. I took a close look at the key and the battery contacts were dirty so I used some contact cleaner on a bit of paper towel and cleaned the contacts. Reinstalled the battery and now the key is working properly. I’ll keep an eye on it but my guess Is the dirty contacts were causing a poor connection. I went and checked the old cell and it was still in the “good” range but also in the “bad” range. It’s possible that the old cell is still good but for a few bucks on the battery it’s nbd.
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