It sounds like BMW needs a software tweak if you ask me.
Sometimes the KISS principal is the best. The solution is simple if not as efficient... the car should default to a traditional charging system when charge or ambient temperature drops below a given threshold.
Rodion, perhaps you have a point about heating the battery. The traditional location for the battery is under the hood (bonnet) where the engine heat may contribute to a better charging state. I wonder if other vehicles with trunk mounted batteries have this problem?
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