It certainly should be fine.
However, I left my X6 M50 sit for 5 days and when I came back the date/time had to be reset and all of my trip/personal odometer's cleared. No error message (like low battery or high drain or anything) and she started right up. Brought it in but they didn't find any reason for it. Coincidentally the car stopped communicating with the ConnectedApp right after this. Updated FW, rebooted iDrive, and all has been well, but I've not let her sit for more than a couple of days since then.
I have a 2 week vacation coming this summer and am wondering if I shouldn't get a trickle charger to avoid the same issue.
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