help please 2010 bmw 335i xdrive N54 E92 im at a loss

[2010e92-n54]

i own a the bmw for over a year now, yesterday after washing the car i lost/drained the battery sitting in the carwash bay long enough to wash her 10-15 min tops.
didnt wash the engine bay. my queston is this what may cause the battery to get drained or where to begin to start looking at any help will be appreciated.
ive replaced the alternator and battery recently as well her in a bit ill run the scan tool and see what it pulls up

 

[Solo Man]

Since you had the car washed I would check for water leaking into the car. Check the carpets for water. if they seem damp at all i would remove them and check all the electrical connections underneath.

 

[2010e92-n54]

Since you had the car washed I would check for water leaking into the car. Check the carpets for water. if they seem damp at all i would remove them and check all the electrical connections underneath.

Me and my partner did that including the ecu box under the hood on passenger side. Bone dry. We hooked up jumper cables and It started first crank.. idk im are a loss

 

[modocrat]

Maybe start with getting the battery tested?

 

[NBN]

You say the battery was recently replaced. Did you replace with one that has the same cold crank amperage as well as amps? Also very important to have the battery registered to the car to ensure that it syncs to the cars alternator

 

[modocrat]

You say the battery was recently replaced. Did you replace with one that has the same cold crank amperage as well as amps? Also very important to have the battery registered to the car to ensure that it syncs to the cars alternator

Yep, I replaced it with a Willard 658 90Ah. Battery was coded/registered via Inpa/Ista.

 

[NBN]

Yep, I replaced it with a Willard 658 90Ah. Battery was coded/registered via Inpa/Ista.

Not you... My initial response was meant for the O. P... He stated in the very first post that he replaced both the battery and alternator

 

[modocrat]

Not you... My initial response was meant for the O. P... He stated in the very first post that he replaced both the battery and alternator

My bad, I don't know why I thought this was my wiper issue thread.

 

[Riaad]

My bad, I don't know why I thought this was my wiper issue thread.

rather save your responses for after sunset. 👀

 

[2010e92-n54]

You say the battery was recently replaced. Did you replace with one that has the same cold crank amperage as well as amps? Also very important to have the battery registered to the car to ensure that it syncs to the cars alternator

How do I register the battery, I've never owned a car that I've had to do this with

 

[NBN]

How do I register the battery, I've never owned a car that I've had to do this with

You can use a plethora of tools such as Carly, mhd, Inpa, protools etc etc... But they requiree a combo of paid subscriptions and hardware/software/apps

My suggestion would be check with a reputable battery reseller, they might be able to help you out at a minimal cost.