It looks like battery drain in standby got noticeably worse, almost twice compared to JB. I don't see any particular app causing this. Still it's not terrible with battery but I like to get back to where it was with JB. After some looking into what's going on, I figured WiFi is biggest hitter which was never the case prior to KK. If I keep WiFi off in good signal area, it seems to be about the same battery life. But at my work, verizon signal is horrible and I rely on work WiFi for data on phone. I'm not sure if FDR will resolve this WiFi drain issue. It seems more like a bug in KK update. Anyone had similar problem and did factory reset resolved it?