Panasonic AJ-D215P - Manual (Page 58)

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Replacing the back-up battery
The unit is shipped from the factory with a back-up battery already installed.
The “BACKUP BATTERY EMPTY” message appears in the viewfinder when the back-up battery
has run down.
Consult with your dealer, and replace the battery with a new one (CR2032 or BR2032).
Backup (lithium) battery