Siemens Acuson Antares CMOS Error

Acuson Antares Ultrasound Scanner reported dead CMOS battery. It also reported incorrect date - this is understandable in view of the dead CMOS battery. It also says 'syngo appears to be invalid and as a result booting up cannot continue.'

I would like to replace the CMOS battery in the hope that this will correct all the reported errors. But my question is: where is the CMOS battery located in the Antares machine ?. I would also appreciate any other instructions that could help resolving all of the above reported errors.