What does it mean when the 2nd LED flashes on a P4 battery?

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Never has this happen before. Came in from a flight. Put the two batteries I used on the charger and went away. Both worked normally during the flights. A while later, they are done. One is off, no LEDs lit, per usual.

The other one has the power circle lit up and the 2nd LED from the power button is flashing. Two times, pause, two times. Repeating.

What’s that mean?
 
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