Do not boost a vehicle especially one with tons of electronic components. Any charger will do. I have a trickle charger and a Crappy Tire charger with starter option. It is best for the battery to slow charge it over night. BMW dealer has one that is around $70.
Try charging it first, if you can't start it the next morning the battery needs to be replaced.
Did you receive Increased battery discharge message before? I would push for the dealer to replace the battery under warranty.
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