Battery draw on 2021 CX-30

[Warrick72]

Dear friends,
I'm owner of a CX30 skyractive G 122cv (since july 2920) in Spain (sorry by the translation), and me too have a problem since last service maintenance (2nd service).
When I don't us the car, 12v battery draw and lost capacity.

I've been looking for a rule or pattern that could explain what's happens.

At last I bought a battery controller (BM6 at AliExpress), trying to identify the problem

I've detected at dawn and nightfall a 3 min consumption peak of voltage.
It cause at least a 8% of battery capacity in each event, these data are 24h the car into the parking.

....2nd part....
I installed the battery controller on 20221006, and first results were this:

I´m in contact with other owner in Spain with same problem. He take his CX30 Skyactive X 186cv to Mazda Oficial Service, and they didn´t any solution. This user paid for a new type AGM battery (more powerfull), because his CX30 leave around somes times, and had to call the tow service.

He has installed the same battery controller than I, and last night send me a screenshot of his app, and I have detected the same leak peaks.

 

[Warrick72]

I have a theory that I would like to confirm.
For 3 days, I`ve been placing a piece to dark tape on the twilight sensor, in the windscreen.
And this leak peaks has dissapear!!!!
Day 20021013

 

[Warrick72]

Day 14

 

[Warrick72]

day 15

 

[Warrick72]

Please, could any other user make a similar test?
I have to organize me at job, to leave the CX30 at Mazda to identify the source of this problem.
Thank for your attention and sorry for the brick

 

[Warrick72]

I have just found it, look like similar:

2021 Mazda CX-30 Battery Technical Service Bulletins​

TSB Number: DRW41A
NHTSA Number: 10200947
TSB Date: August 3, 2021
Date Added to File: September 2, 2021
Failing Component: Electrical System:12V/24V/48V Battery
Summary:
Drw41 - telematics communication unit (tcu) concern - battery drain and connected services. On certain subject 2021 my cx-5 & cx-9 vehicles, a battery drain concern could occur due to the telematics communication unit (tcu) not going to sleep

 

[digitialdoc7]

I am rather annoyed at Mazda that there was not a single software update (at least OTA), that at least attempted to address this issue. At the least, they should try to make it less sensitive as I still get it if I take a bunch of short trips, but thankfully the battery has not died.