[Dx11]

So I've had battery issues for a while. Basically my main battery drains within a few days.

I tried many things for myself, then gave up and brought it to a garage. He found out, it only drains when the alarm is on. When you lock the car twice, the alarm doesn't turn on, and the battery doesn't drain at all. So he said, the alarm battery is probably bad and keeps charging.

Now, how can I fix this? The garage said the battery is embedded in the siren module and he probably can't get that part, but he'll look into it.

Is there an easier way to fix this? What kinda costs should I expect? Does anyone happen to have a BMW part number so I can look for myself?

Thanks!

(2012 e93 btw).

[lordnikon]

You could attempt to disassemble the module itself and see whether the batt is replaceable.

https://www.realoem.com/bmw/enUS/sho...diagId=65_1765

[Dx11]

Originally Posted by lordnikon

You could attempt to disassemble the module itself and see whether the batt is replaceable.

https://www.realoem.com/bmw/enUS/sho...diagId=65_1765

So the battery is inside part 3? That's a small battery, no wonder it gave up after 11 years.

[ptpending]

it is not small battery,
it is CR123
thats why it lasts 10+ years

[Dx11]

Originally Posted by ptpending

it is not small battery, it is 9-v one
https://en.wikipedia.org/wiki/Nine-volt_battery
thats why it lasts 10+ years

Wait, it's literally a 9v block battery in there? So I could buy a rechargable of that and just swap only that?