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Concerns about S21 (standard)

(Topic created on: 02-03-2021 01:00 PM)

So, I've been the owner of an S21 for about 2 weeks now and in that time my experience has been rocky to say the least. 

My first point is the performance of the camera:
This is less about the hardware and more about the image processing, I've noticed that compared to photos shot from my old (and now traded in) S10 the finer details are a lot less. Things like fur and small complex objects like stones on a beach etc. just come out as blurs unless they're the main focus of the photo, whereas on the S10 they were blurry but still had some detail remaining. This is because the image processing seems to favour making the images sharper, which is fine if all you're gonna do is post them on Instagram as it makes them stand out, but as I will be using some images as references for Game maps having the fine details removed because of the processing making all images overly sharp is not ideal. 
And the 64MP sensor is very poor, it only seems capable of delivering good results in specific light conditions, and even then when zooming in it becomes apparent that the image processing just adds more sharpness to photos from the telephoto lens, once again sucking out the detail. 

2nd Concern is the battery usage:
Last night my phone went from 51% to 14% (Pictured is around 20ish%) over the space of 1 hour, and with seemingly no solid cause. Since the battery usage no longer lets us see how much battery is used by system processes and hardware it makes it difficult when something is draining the battery at that kind of rate and we have no insight to what it could be. I am certain that is was not an app, as none of them reported any rise battery % used in that time. The Thermal Guardian app reported high CPU usage in that time (between 60% and 87%). I did submit a report about this in the Samsung Members app, and in that I pin-pointed the Clock app as the only different thing I did prior to the huge battery drain was set a reoccurring alarm, and turning it off stopped the high usage. 

My main concern here though, is how inconsistent Android battery life is compared to iOS, and this isn't helped by all the bloatware Samsung pre-installs and forces us to keep on the phone, and I do notice that even though I don't use those apps at all, they still occasionally creep into the Battery usage most days with around 0.2% usage each, which adds up when it's 5 or so apps doing it. We can't uninstall these apps or even disable them.

But back to the inconsistency, I don't really use my phone heavily, It's mostly a mix of Twitter, Reddit, Samsung Internet and some games like PokeGo or SinoAlice that I play for about 10 mins maybe. Yet, despite this fairly consistent usage I notice that some days I can push for +4 Hours of Screen On time before 50%, yet other days barely manage 2 Hours. Now, the conditions stay the same each day as I'm home 95% of the time, Wifi stays on all day and nothing else does, so what causes such a huge variation in battery life from one day to the next when my usage is almost the same day in day out? 

Final Concern; Heat:
This phone gets noticeably warm when I use it, even just scrolling through twitter causes the top left of the phone to get warm to touch, something I have never experienced on an Android phone since my Galaxy Ace (Phones owned: Galaxy Ace, Nexus 5x, Nexus 6P, S7, S10, S21)
I've seen quite of people reporting similar which leaves me asking, is this a software issue, something that's causing higher than expected CPU usage? Or is it a hardware flaw with the Exynos variant? 

Apologies for the long post, just, this is definitely the rockiest switch to a new Android phone I've had, and the S21 seems to have issues that the previous S Series phones didn't have which I guess just leaves me questioning the Quality of the new phones. I do really hope that these are software issues that can be fixed with the monthly updates, and everything else about this phone is brilliant, but these things are kind of ruining what is otherwise a great phone. 


Before you ask, yes I have tried clearing the cache partition. It helped a little with the heat (still gets warm though) but the other 2 issues remained the same.

Thermal Guardian reporting higher than usual temps, citing High CPU usage as the cause.Thermal Guardian reporting higher than usual temps, citing High CPU usage as the cause.Huge Battery Drain by something, all the apps listed fall under my expected % used of them considering their Screen Time.Huge Battery Drain by something, all the apps listed fall under my expected % used of them considering their Screen Time.


I agree with you as I have the s21 ultra and I have been experiencing battery troubles and heat troubles. I didn't expect this from a flagship
First Poster

I am also having a heating issue with my S21...  10 to 15 minutes of playing games is making the device heated up... 


Helping Hand
if you was to lower it then it prevents device overheating I have mine on level 2

Screenshot_20210302-134757_Thermal Guardian.jpg

Screenshot_20210302-135400_Thermal Guardian.jpg

that only really affects the heat from doing something that's high intensity. the heat from just normal usage won't be affected by the Thermal throttle unless something is hogging resources.
Samsung Members Star ★★

Hi @Joshy2520  Whilst there are mixed views on the S21 camera should be an improvement on the S10,even if not a significant advance .    The S21 ultra certainly seems to have the most impressive camera.  See more here in one review    However different experiences and some critiques in this forum, updates though may fix some of the issues 

Sime customers experiencing overheating but it is by no means universal, see some tips in this thread 

As far as battery life goes some possible solutions including a post of my own  in this thread 

However agree it is concerning if battery  depletion is so inconsistent.




I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.

Helping Hand
everything above aside. it's the same across a minimum of 50% shipped devices worldwide including the SD888 model.

OneUI 3.0 had terrible drain and extreme heat from various sources and smart switch in particular,

3.1 has shifted the heat sink issue to the main camera sensor based on feedback on forum.

according to samsung 3.1 and upcoming 3.2 is meant to address these issues

need to add in that the vast majority of apps are still being optimised for Android 11, which easily could affect your phone in ways where you think it's something else entirely.