EBME Forums Forums Maintenance Technical Assistance Vela ventilator has warning "low clock battery"

Hi everybody.
My Vela ventilator now has a warning.
The warning is: "low clock battery"
I don't know what it mean, so if anybody has much experience of this machine, please give me advice.
Thanks and best regard.
Five months ago, this machine didn't pass selftest procedure. And then couldn't enter main screen. When I changed 3.6V CMOS battery, it worked ok.
Do you thinks the warning about mentions this CMOS battery.