Are other entities provided by this integration properly (at least sometimes) updated in HA? Double check this.
What is a current exact state of your “battery state” entity? Post a screenshot of this entity from Dev tools. Make 100% sure that you select the same entity with same entity_id which is shown on your screenshot from the 1st post (because may have have several entities with similar names).
I wish to use my phone’s battery state in an automation ( charging/discharging ).
In the developer tools this is shown correctly.
But in an automation the state’s options are Unavailable and Unknown.
(The same is true for my android tablet.)