You got the back off now you can not remove the battery you also own several of these watches and you m frustrated every time you need to change the battery Do I need to send back to skagen?

There is a way to get the battery out of the watch, but you need jeweler's equipment. Since a good battery will last about four years, it might be best to invest in letting the jeweler change the battery for you. If this is not an option for you, try going back to the place that sold you the piece. They will probably change it for you for a very tiny fee. Any good jeweler will have posted prices for watch battery changing. Those tiny innards will damage easily and there is a chance that you will damage the crystal if you try to do it yourself.