While I've only had mine since Dec 30, 2017 and just got them working 2 days ago, I can't answer that question. I had to call Geek Squad, Sony help, and Sony Co as we were trying to hookup with a Sony tv. That didn't work, so we had to get RCA headphone cord and they work perfect now. Even though a Sony person from Best Buy said that cord would never work, he was wrong. That RCA cord is what made them work. There was a problem Sony new before Christmas that they had to fix if you were hooking Sony headphones with a Sony tv. Its the RCA cord with 2 ends.
Your battery should be charging if you put the headphones on the base after each use.
Good Luck