[bm92]

ok thank you, driver side mirror glass is very hot with ignition on, not with ignition off.
First test, i will disconnect and see

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Last problem is the battery drain, if you let the car 5 minutes alone, impossible to start anymore...

Battery drain or bad battery instead, provided that the battery is in almost full charge?

Battery FA is -B110
Bosch 110Ah
Normal battery, not AGM
Battery fully charged but may be damaged due to many full drain...
Can i replace with AGM or no need ?

[Node]

Even one full drain is deadly for lead-acid batteries. Definitely sounds like it's now dead...

P.S. Mirror glass is too tiny to drain battery that fast... hot or not hot...

[Stratofortress]

ok thank you, driver side mirror glass is very hot with ignition on, not with ignition off.

Battery FA is -B110
Bosch 110Ah
Normal battery, not AGM
Battery fully charged but may be damaged due to many full drain...
Can i replace with AGM or no need ?

Unlikely that the heated side mirror can draw that much yet you may compare if there is much difference to the other side.

If you end up replacing the battery note that up to 95 Ah AGM battery can be coded to car (FA -A090). Also recall to register battery change to car.

Final note, has the battery (+) cable been checked and serviced in the trunk (both inside and outside) as there have been many cases with corroded (+) cable with these vehicles? Engine grounding also worth checking.

[bm92]

Ok thank you guys, i think i will change for Varta 95Ah AGM and change FA to -A90.
And i will check both positive and negative cables.

I will test and report.

[bmchicago]

outside mirror glass overheating during diagnosis/coding/programming is normal on E7x, E6x, E8x. Its just more noticeable on E60's