Shop to replace battery in Valencia (Spain)?

@roberto25473 you could use the guide from here Google Pixel 6a バッテリーの交換 and try this yourself. After all, that is what we advocate for on here :-)

If this task is to daunting for you, check with your local repair cafe's. Those great people are always willing to help others out. https://www.repaircafe.org/en/cafe/repai...

As for recommending repairers, we do stay away form that. It will never be an objective recommendation, since everybody will have had different experiences. Of course, you can always s do an online search for one of those.