That's just a normal Sony camera. *ba dum tsh*
Joking aside, that sounds like a specific problem with the battery holder inside, or whatever you call it. The part needs replaced, possibly. I had that same problem with my Canon 7D. I did use it for half a year without doing anything about it. Just kept the battery out when I wasn't using it. Then again, that camera needed an entire day to drain. Not 30 minutes.