same exact thing happened to me. i did reboot my phone a few times (actually the phone ran out of battery while sitting on my desk unplugged overnight), but it hasn't seemed to help much. i was consistently getting ~20 hrs with the regular battery, now i'm lucky to get ~8 hrs.
i've been uninstalling apps to see if that will help the matter. i really don't want to have to factory reset this thing. i might also try disabling auto time zone; i believe the iphone 4s was having a similar battery drain issue because of this, not to mention that Moto also posted something similar.