I found when I first ran pycharm it did some indexing for a few minutes before it settled down. That caused some spinning of fans and higher CPU usage.
Yeah, sitting at around 7% for me on a 2011 MBP i7, can't remember what it was before I upgraded. I've not noticed worse battery life though.
Sitting at ~3% for me, on a 2.4GHz 2010 15" MBP, running 10.6