Hi Gemor,
The PSR-9000 does NOT contain a Battery.
First of all, please check if the latest Firmware (V3.06) is installed on your instrument. If you are still on an older version, you should download the update V3.06 from the Yamaha Support website:
>>>
https://uk.yamaha.com/en/support/updates/firm_psr-9000.htmlNote: Newer models save changed system settings automatically when closing the relevant setting display in the so-called "System Setup" (in the
internal Flash Memory). With the PSR-9000 this does NOT work automatically, but you have to MANUALLY execute the "System Backup" function (press the "
A" button in the Main display and follow the on-screen instructions).
In the "Parameter Chart" in the Owner's Manual V2 you can see in the column "System Backup" which parameters can be saved in this way.
Some parameters may
not be able to be saved in the System Backup. Then please check whether these settings can be saved in
Registrations (column "Registration Memory" in the Parameter Chart).
If you haven't already done so, be sure to download BOTH manuals from the support site: Basic Manual V2 and Supplementary Manual V3:
>>>
https://uk.yamaha.com/en/support/manuals/index.html?l=en&c=keyboards&k=psr-9000If you have any further questions, please come back here.
Best regards,
Chris