When have you last updated this devices Sailfish? The latest version is now 3.1
Have you checked the Jolla forums (Together) if there is a way to fix this battery drainage?
https://together.jolla.com/question/192789/battery-life-xa2-4113-sailfish-3008/
https://together.jolla.com/question/169834/sailfishx-extreme-battery-drain-how-to-find-cause/