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With 5 weeks of inactivity coming up for my '19 40i I've been wondering about the same thing. Did not have an issue with the same time period on my F15, but I believe the G05 has a greater parasitic load when parked.
Emailed the dealership with whether they thought a trickle charger would be needed and the response was;
"From what we see, you will need to put the vehicle on a trickle charger or battery tender. Usually about the 3 week mark the car starts shutting off systems to preserve the battery."
The dealership certainly has experience with vehicles sitting around, not being driven, so I give their recommendation some weight. I expect they're being conservative, but am strongly considering procuring a trickle charger for this upcoming period of inactivity.
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