Will do... I have also noticed that Maps seems to be waking the phone a lot, and activating the GPS, and the amount of power it seems to draw for such a short time seems very high, will try to look at that too. Might try uninstalling updates and disabling for a bit, but it's usage seems consistent across both of my phones, and only one is having moderate, inconsistent battery drain issues, the other one I have noticed the battery life has increased significantly.
Google Maps definitely seems to be doing something in the background, not a real significant amount by itself, but compared to other things it's really high...
76% Battery - 8h 2m 57s on battery
Maps 28% - CPU Total 35s, CPU Foreground 29s, Keep Awake 1m 19s, GPS 57s, Tx 60k/Rx 277k
Screen 26% - 21m 36s
Voice Calls 25% - 13m 31s
Cell Standby 9% - 8h 2m 57s
Phone Idle 8% - 7h 41m 21s
WiFi 4% - 2h 16m 26s
And I only opened Maps long enough to make sure Latitude was off and background caching was off, and it used 28% of the battery? Seems very odd...
EDIT: Checked my other (personal) Rezound that was hardly used to today as well, same results, Maps is the biggest battery hog with only a couple minutes of CPU use it took up 27% of the battery, and I never opened it even once.
EDIT2: Did a Google Search for "google maps using battery" and low and behold the HTC One series is seeing this as well, so is the HTC Evo 3D and Evo 4G LTE, and handful of other phones too... some comments are that this is being used by other services that use location like SoundHound, Weather, and such, but I haven't used any of these apps today at all, although my lockscreen and homescreen both use weather.