So after looking into this issue a bit, I'm definetly not alone is getting ultra ****** battery life after updating. Apparently the energy vortex to oblivion is because os4 feels the need to keep a constant connection to wifi, even when the device is in sleep mode. Since 2G devices dont get multitasking, that has absolutely zero possible use. Might as well drill a hole in your gas tank and then wonder why your mileage sucks.
Man, apple really dropped the ball here. Did they actually test their new os for longer than it took to install without bricking? Having to disable wifi now completely destroyes the whole reason I bought this thing. I can buy a mp3 player at Wally world for $20 that's as useful as my $250 iPod is now.