Issues with the battery life :(

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shem2409

Senior Member
Feb 5, 2013
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The battery on my 512Gb Exynos version is an absolute joke as well. Today I barely hit 4hrs SOT. I am seriously considering going back to my P30 Pro.

I will give Samsung a few more days to fix this with an update as I enjoy the phone otherwise (and already bought a few cases) but it's very disappointing
 

joakimbo

Senior Member
Feb 18, 2015
863
250
For sure, there is something wrong with the February updates. Battery on mobile data is draining so damn fast. Yesterday I was out driving on work. Barely used the phone during 8 hours. Lost 40%. That's insane.

They need to fix the modem firmware, or else I'll return it, as well!
 

syrinx75

New member
Mar 1, 2021
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I had a noticeable improvement of battery life: I've deactivated all the routines running when the screen is OFF (ex: detection when the phone moves, detection when the phone seats on his screen, etc...) All those are on the same page of settings.
 
So I am a long time Samsung user. I had the S20 plus and wanted to try the smaller S21. Only because of the trade in for the plus with Samsung. I have the S21 256gb unlocked snapdragon version. I just got the phone yesterday. Here is a copy of my battery life after getting my apps loaded. The battery life is almost 7 hours screen time which is all on WiFi. Mostly logging into my apps and cleaning up contacts and playing with the phone. After a few days I'm sure the battery life will get better.
 

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joakimbo

Senior Member
Feb 18, 2015
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So I am a long time Samsung user. I had the S20 plus and wanted to try the smaller S21. Only because of the trade in for the plus with Samsung. I have the S21 256gb unlocked snapdragon version. I just got the phone yesterday. Here is a copy of my battery life after getting my apps loaded. The battery life is almost 7 hours screen time which is all on WiFi. Mostly logging into my apps and cleaning up contacts and playing with the phone. After a few days I'm sure the battery life will get better.

I think battery life issues are mostly related to the Exynos model. I'm quite sure it's an issue with the modem firmware, since people are reporting battery life issues on LTE/4G
 
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joakimbo

Senior Member
Feb 18, 2015
863
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I installed this update today on my S21, but Samsung seems to have removed it from the ota servers. Weird I hope this doesn't hide a bug yet. Because available this morning and withdrawn this evening.

Ah okay.. Hmm.. How can you know that if you already updated? Did you see any improvement?
 

naudmick

Senior Member
Jan 26, 2012
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I saw it with phone info, because after having updated the last firmware in OTA had returned to AUB8. But honestly yes a visible change. I charged 100% last night, this morning I am at 87% after 12:23 hours of use. And 1 hour of stupidity. 😉
 

joakimbo

Senior Member
Feb 18, 2015
863
250
I saw it with phone info, because after having updated the last firmware in OTA had returned to AUB8. But honestly yes a visible change. I charged 100% last night, this morning I am at 87% after 12:23 hours of use. And 1 hour of stupidity. 😉

That's really promising. What model do you have? Processor?
 
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xdafly

Senior Member
Jul 3, 2010
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Have no issues on two(2) phones directly from Samsung. Both have received a 690 mb size update within last week and both were wiped cache after setup and updates.

Disabled about 25 apps and services via ADB AppControl Extended version.

Both are charged up until about 85% battery and then disconnected and used heavily for work about 6 to 7 hours daily. In the morning, charge level is around 45% and charged until 85%.
 

joakimbo

Senior Member
Feb 18, 2015
863
250
Have no issues on two(2) phones directly from Samsung. Both have received a 690 mb size update within last week and both were wiped cache after setup and updates.

Disabled about 25 apps and services via ADB AppControl Extended version.

Both are charged up until about 85% battery and then disconnected and used heavily for work about 6 to 7 hours daily. In the morning, charge level is around 45% and charged until 85%.

It's for sure something wrong after updates. I've used the phone with the same apps and same usage since start. Had consistently 6 hours SOT over 24hrs at the beginning. After the February update I was down to 2-3 hours SOT. New update came, back to 6 hours. New update again, 4 hours SOT.

I've seen people on reddit complaining about exactly the same battery after these updates.
 

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  • 1
    After over 2 months with this phone I'm replacing it for a pixel 5. Just released dxomark review confirms my impressions about the pictures and video capabilities - i wanted an upgrade from P30 pro but it's not the case. I tried a lot improving my battery but still it's never over 4h. If I enable volte it drops to 3h.
    Totally agree with you. I've had this phone for over 3 months and no trick or update software from Samsung has improved anything. Never over 4 SOT. Just sad and bad...
    1
    First day with pixel 5 and I'm amazed. It's much more fluent than s21, camera and videos are great, all the day with 5g volte and battery is great so far.

    Screenshot_20210421-153815.png
    1
    On my S21 Exynos I'm finding the battery life fairly good.

    It's mostly on wifi but 4G and Volte is on I get about 5.5 to 6.5 SOT with 120hz and normal mode (not power saving).

    If left alone the the standby time is good, dropping about 0.4% per hour.

    The one thing I have noticed that seems to kill the battery is using the camera, this looks to use about 30% an hour, fine if you're capturing an odd snap but it mounts up if you try and use it a lot.

    It even uses a lot of power just with the camera app open and the viewfinder showing waiting to take a picture.
    1
    Can we force 60hz?
    Yes in the screen settings.
    1
    I've come from three to four years of using some Chinese devices, including Huawei, Xiaomi and Realme, which use the same flagship Snapdragon chips as the main Android OEMs (bar Huawei) do and the battery life is remarkably good on those. So coming to the S21, the battery life certainly feels average and this is compounded by the fact that charging is very slow. I guess I got spoiled by Realme's 28m 0-100 charge times.

    So far, I love the design and the feel in hand of this device. Brand recognition too, if there's such a vain thing. But there's a lot of love hate confusion I'm getting with it. I got tired of buying Nexus and Pixel and Sony devices and tried the Chinese offerings, and I must say I was pleasantly impressed. Good to be back with this very attractive little powerhouse. Wish the software was not so taxing on the battery.
  • 6
    This is quite embarrassing. Flagship phone, people recommending to disable apps and switching a low tier network that's a decade old, not even enough for it to survive a day.

    I'm taking my pitchforks to samsung hq.
    5
    I tipped the two biggest tech news sites in Norway about this issue. They actually posted article on this matter. They've been in contact with Samsung today, and Samsung said they are aware of the issue, and working on an update.
    4
    Last nights update for Exynos version seems ro have fixed the battery life for me. I am back from work and I have 50% battery with 3.5h SOT.

    I have put my screen back up to WQHD and switched on AOD now. Hope it remains this good in the upcoming days :)
    Screenshot_20210305-175337_Software update.jpg
    4
    Meh, bitching here does nothing. Y'all need to do what I did; play with it and work it out.
    Find work arounds for the bad coding.
    Had I not taken the -time- and trouble to do so my 10+ still be a battery hog.
    Just gave you 3 or 4 good solutions. Devise your own... as each variant and user have their own unique issues and requirements.

    Stock Androids are fun to play with... and almost crash proof.
    Lol, a lot easier than doing regedits🤣
    Battery life is bad with 4G turned on, so samsung should fix that, either they have some problem with baseband or they have wakelocks triggerd by 4G. With 3g battery life is pretty decent with bluetooth and gps on, 120hz and sync turned for all apps. What's the point of having smartphone and flagship if you have to turn off every functionality?
    3
    Amazed that all you allegedly tech-savvy guys are worrying about battery life with a phone that's less than a month old. The AI has to learn your usage pattern before battery management can kick in that takes about two weeks and the battery will not reach its full capacity for about a month that's why AccuBattery reports it wrong. Then some of you are doing resets or worse so the AI has to start learning again. Sad

    You think AI does some magic? 😁

    IMG-20210205-WA0010.jpg
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