Can you clear up my doubts about these sentences?

I have some doubts regarding these sentences:

My bike’s battery is discharged.
Is it Active or Passive voice sentence. I think its Passive. Because if you ask a question to the verb what is dicharged? Answer is battery. but the is discharged itself then what is the subject in the sentence.

My bike’s battery has discharged. Can this is alternative question for the same sentence.

Also, sentence below:

It was not expected from you.

Does “Expected” act as a verb or an adjective here in this sentence?

If it’s verb then the object is “It”, Right??