I just got a Verizon Galaxy S6 a few days ago. So far the battery life has been so poor that I'm considering switching to something else. From what I've been reading, it appears that the S6 has issues with how much power it is trying to drive to the wireless connections at a given time, causing excess battery drain even with the screen off.
Matt, did you experience any unusual battery behavior during your testing?
I did not experience excessive power drain related to wireless activity, but I'm on a different network (T-Mo), in a different area, with a different usage pattern, and even a different baseband. So my experience won't mean much for you.
I did read an article (forget where) showing that the Samsung RF components used more power than the Qualcomm equivalents. Since the Verizon model uses the Qualcomm components, I'm surprised you're seeing excessive power use. Did you switch carriers when you got the S6?
This could be a software configuration issue. How many different apps do you have that get/receive info from the Internet? How aggressively are they fetching data? Setting email, facebook, twitter, etc. to fetch data every 30s, for example, would keep your radios powered up and drain the battery more quickly. Look at the following:
1) Settings->Data usage to see which apps are consuming the most data
2) Settings->Battery->Battery Usage to see what's using the most power
3) Settings->Battery->Detail to manage which apps are running and to check the "Abnormal Battery Usage" tab.
You might try disabling messaging/social media apps or at least dialing back the fetch policy to at least 30mins for each as a test.
- Matt Humrick, Mobile Editor, Tom's Hardware