re:
I've never seen a phone that has such a difference in reviews as the S9+. If you watch a lot of reviews on battery or camera a lot of reviewers praise it and yet you come the forums and people criticize the battery,camera etc. I really believe that they had different shipments with really good S9+'s and one's that had problems. Kind of like the Pixel 2XL screen. A lot of people say it's horrible and yet a lot of people say nothing is wrong with it.
It's definitely dififcult to get a consensus from reviewers.
Here's one that says the S9+ is worse than the S8+
And gsmarena agrees:
https://www.gsmarena.com/samsung_galaxy_s9-review-1734p3.php "Anyway, the Galaxy S9 achieved an overall Endurance rating of 78 hours, which is a few hours behind the Galaxy S8 because of the mediocre standby performance".
As well as iMore's commentary:
https://www.imore.com/samsung-galaxy-s9-battery-life-problems-and-what-it-means-apple "Samsung perpetually feels a generation behind when it comes to efficiency". WARNING, BIAS ALERT. iMORE is approximately the BGR of Mobile Nations, especially when commenting on Samsung products.
And anandtech:
https://www.anandtech.com/show/12520/the-galaxy-s9-review/8 "The Exynos 9810 Galaxy S9 absolutely fell flat on its face in this test and posted the worst results among our tracking of the latest generation devices, lasting 3 hours less than the Exynos 8895 Galaxy S8. This was such a terrible run that I redid the test and still resulted in the same runtime".
And Android Central:
https://www.androidcentral.com/samsungs-exynos-processor-causing-poor-battery-life-galaxy-s9 "That sort of battery performance is abysmal for a flagship phone like the Galaxy S9".
And Android Pit:
https://www.androidpit.com/samsung-galaxy-s9-battery-review (I didn't know they still existed)
Main point there is the first 10 results on googling, "s9 review battery life" - are all reviews of the battery life sucking, but almost exclusively blaming it on the exynos version.
All of them agree the S845 version gets much better battery life, however that too is not ahead of the main competition:
"The Snapdragon 845 Galaxy S9+ fared relatively well, even though it’s not quite as good as other devices".
Etc. Then the forums, doing what the forums do.... shredded it. According to the forums, it's the worst battery life of any phone that has ever existed, including the Note 7, and that one was on fire. etc, etc.
Biggest point here... is the battery life on the S9+ good enough to where most normal people would never know that there is an issue, if there even is one? Yep, probably. Is it better than the P2XL? Probably not, but then again... it might make a major difference on how you use it.