Guys, i have a Nokia Lumia 822 and I started seeing this problem suddenly in the past 10 days or so. Previously I had to recharge my phone maybe once every day, but since the last couple of weeks, I have had to recharge my phone almost 3 times a day. Initially I thought it was a problem with the battery, but then I realized that the email app for google just stayed in the Syncing.... status. At first I thought it was my slow connection, but even when I got on to a wifi network, it still stayed that way. It took quite a while before the sync message went away. I then went and changed the settings to download email only from the last 2 weeks. Initially I had set it up to download everything. Once I changed the setting, I have started seeing the battery life improve and get back to the original levels.
also saw this for the native mail app when it was configured for Yahoo mail, but it wasnt as severe. I also read somewhere that Google changed something with their imap settings.
Try it out and see if it changes anything for you all.
--Dee