iPhone Xs Refurb. battery duration

I have puchased an iPhone Xs 64GB (refurbished, direct from Apple), delivered the first week of March-2020. During the firsts days of use did noticed the battery don't last as much as expected (if compared to an old iPhone 6 which it replaced), barely getting 6 hours of “Screen time” and it gets much worse if used to listen to music or watching a video. Is this normal?

I have been updating iOS regularly to see if this gets fixed, but don’t see any difference. Battery capacity is currently at 97%.