Sudden voltage drop - Power module or battery?

Attached a screen cap of the logs.

Experienced this just as I was coming back to land.

Aside from the logs (and my telemetry) showing the spiking, I could not tell any difference.

Any idea of how to diagnose if this is related to my power module (or something else) or my battery?

Also, more importantly as this will help diagnose this:

Would a drop of 3.5 volts on a 4 cell battery that still has a charge mean an instant crash? As mentioned, this happened just as I was yawing to land and besides my Taranis warning me of a low battery, the quad behaved 100% normal.

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