I find hanging out and having a good chat with a close friend always energises me while a chat with anyone else drains me. I think the key difference is that I don’t need to worry about how my close friends will think. I know that they will accept whatever I say, so my brain isn’t using as much energy as talking to strangers. Besides, I think things like feeling heard/affirmed goes a long way in feeling energised, so I don’t think it’s strictly physics here.