Electron Red flashing light

Hello all, I’ve been trying to find what this light means on my Electron but I can’t find anything at all. It seems to be the power/battery LED.

Does anyone know?
FYI:
The device is being powered by VIN
It only happens when it’s in deep sleep
The same behaviour occurs if the USB is actually not connected

You are looking for this
https://docs.particle.io/datasheets/electron/electron-datasheet/#led-status

That is awesome, I’m surprised I missed it! thank you!