The Eclipse Omega and Median processor cards built before July 2008 use a Varta CR2430 6430-701-501 3V lithium non-rechargeable button battery. The battery is soldered to the processor card, in order for it to be replaced the processor card must be sent in to a service center to be replaced. The Clear-Com part # for this battery is 400035Z.
CPU card will retain data so long as the battery voltage remains above 1.5V.2.5V
Solution update low battery voltage changed to 2.5V on Feb 2021