Emergency call system battery

[Soopy21]

The call system module is in the center of the car between the subwoofers.

Here is the top of the modem.

Here's the battery:

Anyone know if we can replace the battery without tearing the whole car apart? Or is this just another bmw thing haha

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[Rocksandblues]

You would have to take subwoofer box off. Or least the rear of it