We had a 2005 S80 for quite a few years during which I had to replace the battery at least one time. I don’t recall losing the radio presets or anything like that. If it is a concern you can always connect some sort of small 12vdc power supply - low amperage battery charger, small 12v battery, etc - to the battery cables before you disconnect them from the battery. If you do that you just have to be careful to keep the cable terminals isolated from each other and from the car chassis. Also don’t be turning on any accessories or opening doors or anything else that would draw more current than your temporary power source can provide.
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