I just updated my Android X to version 2.3.3 a few days ago, and now it seems my battery doesn’t last as long!
I haven’t changed any settings, I only keep the bluetooth on (no wi-fi or gps) and whereas my battery would usually last around 14+ hours with normal usage, this new version seems to die in around 8 hours.
UPDATE: I had a reason to flush my android and start from scratch, and this seemed to clear up the battery problem! Why? Who knows! Logic would indicate some app was causing a problem, but I am careful on apps and when I reinstalled everything the battery life was still good.