After submitting your declaration, you have the option of adding the serial numbers for batteries that require a serial number. This is currently the case for Energy Storage Systems (ESS), including home batteries.
You can add serial numbers either manually or via an import.
Restore serial numbers
Once you add a serial number, the status of that battery changes to ‘Submitted’. You can still restore the data by right-clicking the ‘Restore’ icon 
(arrow). The status then changes back to ‘Draft’ and you can revise the line again.
More about how to restore or remove serial numbers can be found here: Restore or delete serial nummers.
The status of your serial number declaration
In the ‘Serial numbers’ overview, you will find a status for each declaration: new, draft, submitted or overdue. More about the different statuses can be found in the following article: The status of your serial number declaration.
Submit and confirm
The progress bar at the bottom shows how many serial numbers you have already submitted.
Submitted all serial numbers? Then click ‘Confirm’ at the bottom.