Thanks for your response.
The Kanso 2, K2, can only be charged while in it’s charger box. So it can not be on your head being used to hear while it is charging.
I am not sure if this is what you are asking.
Keep trying.
Maybe another member can understand what you are saying?
Are you asking if the Kanso 2 battery goes dead while using it?
If that’s your question it has never ran out of power in very long days of use with lots of streaming. The K2 battery is very good.