If you think the battery is ok, then buy a multimeter and start pulling the fuses. I delivered my octavia to the skoda mechanics and explained the problem (as I knew nothing about checking for battery drain). They found that the problem was located behind fuse 14 and recommended a change of the control unit for convenience system - about 380
Škoda Owners Forums. Škoda Octavia. Skoda Octavia Mk III (2013 - 2020) Battery life for 2019 Octavia VRS. My 2019 Octavia VRS is in for service (19,900miles), I took delivery new in Feb 2019. The the Skoda dealer has just contacted me to say that the battery is defective and they are quoting around £300 to replace.
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batterie skoda octavia 2.0 tdi start stop