Sad day today..

[MaverichX5E70]

Sad day today as today is the first day that "White Lightening" (my white '13 X5 35d) had left me stranded and needed to be towed to my indie shop since owning it about 3 years.



About 2 weeks ago I had a used transmission installed after the previous one has shifting issues.

The used tranny had a 160,000kms and my mechanic did a full service prior to installing it.



On my ride home today about an hour from home I got an ABS/4X4 warning and then it started to ride strangely.



I was in a spot that would have been difficult to pull over, so I continued on probably about 2kms.

I finally got pulled over on the shoulder safely and by this time could smell what smelled like burnt clutch.



What has me a bit baffled is while waiting on the side of the road my battery went completely dead, and I could hear what sounded like a relay in the back clicking.

My battery was so dead after 15-20 mins my hazard lights wouldn't work any longer. (Battery is only maybe 2 years old)



Can anyone tell me the correlation between the transmission and how/why my battery would have went dead if there is a transmission issue?



If the tranny had a major malfunction, is there a component within the trans that would quickly drain the battery?



Thankfully the used transmission has a 5 year unlimited mileage warranty through a reputable used parts distributor, but I'm still going to be on the hook for service on the next used trans they provided. Their warranty does cover re/re thank goodness. I'm also going to push to see if they will cover the service costs as I've had the current trans about 2 weeks.