Are the presets retained when using the radio only on mains (without batteries) after removing the mains connection?
In other words, do you have to put batteries in even if you never use the radio without the mains connection?

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Answer

After reading the manual you will find a link in the answer. There is no indication that you cannot keep the presets after removing the power cable.

https://www.modesdemploi.fr/sony/xdr-s41d/mode-d-emploi?p=2

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Question about Sony Xdr-S41d

Are the presets retained when using the radio only on mains (without batteries) after removing the mains connection? In other words, do you have to put batteries in even if you never use the radio without the mains connection?