Single 18650 cell reads 12.5Volts. Explanation?

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Joined Sep 15, 2018

I was to harvest some 18650 cells from a 5S 1P drill battery. After opening the battery, I checked each individual cell in the pack. The first 4 cells read between 3-3.7V while the last call reads 12.5V by itself. May be this is the reason for the battery to be bad. I have checked it repeatedly, I still get same 12.5V or so. The control board is still in place. I have not yet isolated or removed it out of the pack. I have never seen such a reading. Explanation?