Hello
Had a dead battery, it was 6 yrs old, replaced the battery and the new one when dead after not using the X5 for 3 days , charged the new battery and took it to a indy to check, replaced the alternator with a new 140 amp one, didn't drive the car again for 3 days and have a dead battery. Anyone have the same problem?

I am thinking some electronics unit is staying on after the car is shut off?
Thank you
Jim