The Avidyne 700-00004-0XX, 700-00004-1XX, and 700-00030-0XX MFDs contain a 3-volt lithium battery that maintains CMOS memory on an internal processor board and should be replaced after 10 years of service, or when CMOS memory fails to retain configuration data, whichever occurs first.  If the battery is being replaced IAW the ICAW as a life limited part (10 years) this maintenance is considered "preventative" and is not covered under the extended warranty program.

Note: Per Piper Maintenance Manual SPECIAL INSPECTIONS WORK SHEET   Each Ten (10) Years 

For airplanes equipped with the Avidyne FlightMax Entegra EFIS: replace the CMOS battery in the multifunction display (MFD) as required, but at least each 10 years. See Multifunction Display (MFD), 

The Avidyne MFD must be returned to the Avidyne Factory Service Facility to perform this maintenance function. 

Failure of the CMOS memory is indicated by the message “WARNING: CMOS battery failure. Check database expiration date. Press any bezel key to continue.” on a blue background prior to system boot up. After system boot up, the MFD will function normally, but will not have retained the system date and time.