PROBLEM! - Delta Pro Not Recognizing Extra Battery

In this video, I discuss a recent issue that has occurred with one of my Delta Pro Extra Batteries. I have 4 Delta Pros and 4 extra batteries. Recently, 1 of the batteries has suddenly stopped being recognized by ANY of the Delta Pros.
I've tried:
1. Switching which port it is plugged into (allegedly port 1 is the one it should for updates)
2. Switching the battery cable
3. Plugging in another extra battery (other batteries work fine)
4. Plugging in the problem battery by itself
5. Resetting the battery.
6. Checking to see if there are any firmware updates (THERE ARE NOT!)
Initially after opening a case with EF support, they said they pushed a firmware update to the battery. I then connected the battery again to the Delta Pro and it successfully recognized it! I then checked to see if there were any firmware updates available, THERE WAS NOT! Happy that it was working again, I went on my merry way. The next morning I checked and the battery wasn't recognized again. Sad Panda!
At this point I'm at a loss. I've updated my ticket with EF support and am hopeful they'll be able to diagnose and repair the issue. I'm curious if anyone else has experienced this with their extra battery? I'm very puzzled as to why only 1 out of my 4 extra batteries has this issue. It seems very peculiar.
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