Clicking noise when battery off

[FlyboyTR]

Let me join in this clicking party. I have a P3A with one factory and two aftermarket batteries. One of the aftermarket batteries is now causing this rhythmic clicking, reasonably loud. This occurs at the end of a full flight and only when the battery is turned off. Remove the battery and the clicking stops.

I have not checked to see if the used/discharged battery would still cause the clicking if reinserted while hot or cool. I will take video/audio sound bite when this happens the next time. Again, only one of the aftermarket batteries does this. Operational performance is great.

 

[Offroader]

I have 2 PowerExtra aftermarket batteries and they often do it after a full flight. Pull the battery and it stops. Insert it after it has cooled down and it doesn't do it. Seems to me the combination of low (25% or less) power and hot battery is the key.