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Old 11-30-2012, 10:08 AM
edjack edjack is offline
Officially Welcomed to the 'Fest
Location: San Jose, CA
Join Date: May 2007
Posts: 13,456
Mein Auto: '97 540i 6 speed
The internal battery is only for backup in case the car battery is disconnected. This ensures the siren will still sound for some time.

Mine suddenly quit working, and I replaced it. Opened the old one up, and found the battery still healthy.

Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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