Propulsion output has been limited to ensure battery health.

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I have P4P+ for more than 3 years. At last flight I've got a message (a copy from Airdata):

00m 48.8sP-GPS1212.2mN/A10.9m/s50.2m74%13.29V3.472V3.431V3.446V3.376V0.055V100%Propulsion output has been limited to ensure battery health.

The fourth cell of this battery was a bit weaker but the deviation never dropped below 0.070. The voltage of this cell at the moment was 3.376V and the warning lasted only for 2 sec.
The voltage of this (fourth) cell improved up to 3.5V and never went down to 3.3 until the end of the flight. I must say, that this was the second flight with this battery which had been drained down to 77% at the first flight two hours before.
I've never got the message of this kind before.
Should I take this seriously? Should I put the battery away? Or at least start the flight with this batt only fully charged?
Usually I do not fly with the batt not fully charged. Only when I plan to make two flights with one batt then I make the first one very short (drain the batt not more than 25%).
 
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Battery is as old as the P4P? I’ve always viewed batteries as expendable. If one shows me any hint of a problem, it’s gone. No questions asked.
 

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