My battery life degraded substantially after the update too. No new app installed since update. My battery life used to drain at rate of about 2% before the update when the device was not being used, but now it drains at rate between 4% to 10% per hour even when the phone is lying on the table without use. Monitoring using SystemPanel just showed higher than usual usage of System Processes. I removed the battery, calibrated it, but nothing helped. But seems like for most people the battery life either has improved or remains unchanged, wonder why this is different for us few!!! I will wait for a week or so, and if it doesn't improve, I would do a hard reset and see if it becomes any better after re-installing the update.