yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Note 20 Ultra Questions & Answers] pa786:
Hi after update note 20 ultra 3.0 bluetooth having a issue if I made a call on what's up or imo after that my car audio redaio stop working so bluetooth off on my phone and back on then start working before android 10 I don't had any issues I unpaired my phone and pair back its still issue tks
[Samsung Galaxy S21 Questions] JCMate10:
Hi

I just got my S21 256 GB (Exynos version). I moved away from my Note10+ as it was too big and battery too poor, bad finger print reader and then I truly hate the curved displays... I really like the look and feel of the S21. Awesome phone, nice screen, much better cellular reception, fine finger print reader.

BUT... The battery is aweful. I get 3½-4 hours screen on time and then its dead. Yesterday it went from 100-85 % after 50 min of browsing using Chrome. During the night (when it is not charging) energy comsumption seems great! the curve more or less flat-lines so it is only when being on. AccuBattery estimates the capacity to 3.820 mAh.

Could it be due to restoring the old backup from the Note10+? Any good ideas?

Should I just return it and get another (S21 or another brand). What are your experience with the battery life?

Thanks!
[Samsung Galaxy S21 Questions] DaReDeViL:
Hi

Restoring backups can be problematic sometimes. Try to factory reset your phone and install your apps manually.
[Samsung Galaxy S21 Questions] JCMate10:
But then again, why? I guess it does not backup app data but only information about what apps I have? It seems to be downloading the latest apps from Google Play when restoring a backup?
[Samsung Galaxy S21 Questions] HugePotato:
Hey, I have a similar problem as you I guess. My phone has like 6 hours SOT max on 120 Hz if I unplugged it and used straight up without putting it down. Normal day is more like 4 hours SOT with background synchro etc. Guess that 120 Hz screen is real power hungry as some tests have shown that you can do more than 9 hours with 60 Hz.... What's interesting is that S21+ loses only an hour of SOT with 120 Hz enabled. I have also SmartSwitched from S7 but plan on factory resetting in a week or so but I don't think it will do much.

Guess Samsung may in time make things just a little better with updates but we can't know that for sure. For me it's just fine right now, if I had a long day I would use power saving to make sure it stays alive. Coming from S7 with a detoriated battery it's a huge upgrade for me anyway but I fear that battery will have to be replaced in 2 years time max.

edit: some app data is transferred as well for sure but I'm not 100% positive if it's Google backup or SmartSwitch. Anyway I think that in this case it's just a very power hungry screen
[Samsung Galaxy S21 Questions] JCMate10:
If I cannot make the battery perform with 120 Hz, I will send it return... Whats the point of buying a new fancy phone if you need to disable all the new an fancy? :) 60 Hz is like any other phone, and by using power saving you will throttle down the CPU and GPU so it is comparable with any other old phone. I think many reviews seem to say that battery life is nice - even with 120 Hz, so think it must be something else.
[Samsung Galaxy S21 Questions] HugePotato:
I will tell for sure after resetting the phone but that battery sure does not last as long as it should in my opinion. Especially in comparison to S21+ or Ultra that have 20% and 25% bigger batteries respectively but last way longer. Ultra has a better screen but Plus model still is more efficient I think and that is just ODD in my opinion . You could just disable 120 Hz on some days without turning on power saving so CPU stays the same.

Edit: One more thing is that some youtube channels or reviews post battery tests where they play youtube videos for 10 hours straight but come on it's not realistic usage. I got messaging apps etc all synchronizing and that makes the phone burn the battery way faster.
[Samsung Galaxy S21 Questions] DaReDeViL:
Let's not forget that S21 serie has an adaptive screen refresh rate which depends on the usage, not fixed 120Hz.

About battery life, I come from a regular S20 which has the exact same 4000mAh battery and can attest that the regular S21 lasts way longer after 4 days of use, and it can only get better.

First thing to check is the network type. If you don't need/have 5G, think about lowering your setting to 4G max as searching for 5G is very power consuming.

Enabling location search via bluetooth and wifi also drains a lot of juice.

Also ensure to have the latest firmware update (AUAB) and check your battery history for any app's abnormal power consumption.

Good luck
[Samsung Galaxy S21 Questions] blinkin:
Same issue here. I got the phone on Friday so it's 3 days of active usage. First two days were terrible, today is better but the phone basically mostly laying on the desk, not much happening. Now it's 2h20m SOT... I restored from Google backup (around 180 apps). I'm coming from p30 pro which had like 7h SOT with same apps setup (but without 5g and 120hz).

What I've noticed is that during the first software update, the phone was optimizing like 450 apps? Does Samsung come with 270 apps out of the box or Google restore screwed thing up? 😲😲😲
[Samsung Galaxy S21 Questions] JCMate10:
I see same insane powerusage of Chrome... 6,4 % in 13 minute on your screenshot...

Funny thing is that when you add all the numbers up, you are far from 100 %. It´s a shame you cannot see the system apps causing the issues.

When I think of my Huawei Note 10 Pro, I am truly sorry that I sold that one :(

I will consider to factory reset it, otherwise it goes back... It is pretty useless if it cannot last more than 3-4 hours screen on time.
[Samsung Galaxy S21 Questions] Soundchasr:
Coming from S20. So far, very disappointed with battery life. Hoping for some improvement in the future.
[Samsung Galaxy S21 Questions] Soundchasr:
On the left is the S21. On the right the S20. See the difference....

View attachment 5207889
[Samsung Galaxy S21 Questions] SpiritBreak3r:
The battery drain is severe in my case. Just using instagram/reddit for 10 mins drops the battery by 7-10%. I did not smartswitch. (S21 256GB Snap)

Edit: The phone's also debloated using ADB AppControl's preset.
[Samsung Galaxy S21 Questions] blackhawk:
Be careful what you disable. If it has dependencies it could cause excessive cpu cycles.

Power management gave me a lot of trouble until I completely disabled it. Maybe that's been fixed but consider all possibilities.

Trial and error... play with it.

Android 10/11 removed some of the diagnostic tools found in Pie... for security, right.

Load Karma Firewall and try blocking some of the system apks especially Android and Google that aren't constantly needed. Unblocking them is just as easy. Unfortunately in 10 and higher it's very useful logging function is disabled I've been told... you know security.

Karma uses almost no battery unless your viewing the app its self.

Apparently Galaxy Labs Battery Tracker not longer works as well. I use this app a lot.

Thanks for nothing Google... these are some of my reasons I'm not upgrading hardware or firmware until at least 😒Android 12🧐
[Samsung Galaxy S21 Questions] JCMate10:
Just reading all of the above things make it sound like Samsung is handfeeding Apple with new customers. Seriously, in 2021 there should be no need to do any manual tweaking of services running. I have no preference with regards to brands; have had several iPhones, OnePlus, Huawei, Samsung, .... I choose my phone based on needs and not brand. I have never, ever, had issues like this with any of my iPhones,. It´s just insane how big a difference there is with power management and effectiveness of CPUs comparing most Android phones with iPhones. I dont tend to start a war here - I use Android myself :-)
[Samsung Galaxy S21 Questions] blinkin:
Unfortunately I have to agree.

It seems like Samsung rushed the release. Or focused mostly on the ultra although I'm not sure if they have the same problem...
[Samsung Galaxy S21 Questions] blinkin:
I have factory reset the device and didn't restore from Google backup, let's see how it goes now. It took some time to download everything manually but hopefully it will help.

Before doing it I tried disabling 5g and AOD but it didn't help.
[Samsung Galaxy S21 Questions] UPSGuy:
I just returned my S21 and went back to my Note 10. The battery life was so bad you could just watch it go down and the 5G was a fraction of the speed of 4G on the Note 10.
[Samsung Galaxy S21 Questions] Superrman:
ive check mine with 2 apps AccuBattery and C battery widget with full charage and some partial both showing avarage of 3777 out of 3888 rated) "4000mah" designed. so yours a bit better then mine so far... you did 1 to 100% change? its more accurate (but stress and ruin battery faster overtime if doing this to much)

anyway with avarage use after 24 hours im with 30% (no heavy games\youtube, just camera and browse\whatsapp. etc)

PS sry for my bad english
[Samsung Galaxy S21 Questions] RobinJ1995:
Can confirm. My 3.5 year old OnePlus 5T with a 3200mAh battery got better battery life than a brand new Galaxy S21+ with a 4800mAh battery. 3 hours screen on time. I'm not impressed with the battery life so far to say the least...
[Samsung Galaxy S21 Questions] xdafly:
Any issues or functions that are normally used but now as a result, no longer work ?

I found out the hard way via ADB AppControl that (as one example) when going down the list of Bixby, I lost Screencapture until some of them were restored.
[Samsung Galaxy S21 Questions] joakimbo:
Exynos
[Samsung Galaxy S21 Questions] Levisaurus:
Yeah, first time i got a carrier phone in the last 10 years, should have picked it up unlocked
[Samsung Galaxy S21 Questions] skyline91:
HT already got update. And between that update and AUAB there were 2 updates i've got. :LOL:
[Samsung Galaxy S21 Questions] Levisaurus:
Guess i just have to wait, i got the phone on the 25th last month and only got the AUAB update after that.
[Samsung Galaxy S21 Questions] dor_t:
Hi,

S21 Plus, Exynos.

I updated this morning to G991BXXU1AUB8.

The battery still drains quickly from the first version 😭
[Samsung Galaxy S21 Questions] tonyk:
Hi everyone!

I have Samsung S21 with Exynos and i had the battery drain problem.

The problem started with AUB3 and I still have this version. I have firmware for Greece.

I made the change in settings, and I selected 3g/2g (automatic)

The problem had been solved after this change!

Here is my screenshot from today!

After 1 day and 3 hours with 7 hours SOT.
[Samsung Galaxy S21 Questions] JCMate10:
Dammit! 😡
[Samsung Galaxy S21 Questions] xdafly:
Wiped cache on 2 phones -- overnight drain slowed considerably. Two days ago close to 700 mb update, then did some random tweaking using ADB AppControl Extended (mostly google apps) and battery was at 80% around 23:00, in the morning at 70% around 07:00
[Samsung Galaxy S21 Questions] tonyk:
I updated yesterday with the new AUB8 for my Samsung S21 (Greece, Europe - Exynos).

1) I left the phone to download the update.

2) Before I proceed with the update i put the phone in the charger (without fast charge) until it charged at 100%.

After fully charged I still kept the phone in the charger

3) I changed the setting for the data back to 4g/3g (Auto)

4) I proceeded with the update. It made the reboot, proceeded and finished the update, and it powered on again after the end of the update

5) After 3-4 minutes I powered off the phone

6) With phone powered off, I connected it with USB cable in my laptop

7) I went in recovery/download mode and I did a wipe cache. Then I rebooted

8) once the phone went on, I put my pin, and I left my phone still in the charger for 5 minutes so as to fully start, and to load everything it has to be loaded in phone's Ram.

Then I took my phone off from charger.

So, after 20 hours I am now with 50% battery left with 4h and 15m SOT.

In these 20 hours:

- WiFi, GPS, data, Bluetooth, everything is on

- All the night while sleeping (8 hours) everything was on (WiFi, networks, GPS, etc) and NOT in airplane mode

- I have day mode everywhere (phone, apps). I never use dark mode

- The phone is connected all 20 hours with my Samsung Galaxy Watch Active 2 (even at night)

- I have location on all time (location share, find my phone, etc)

- I have all time connected my Samsung SmartTag
[Samsung Galaxy S21 Questions] joakimbo:
That's insane good battery. I've got mostly same usage as you got. Also connected to watch. Same procedure after update. Unfortunately my battery life is much worse. Currently 2,5 hours SOT and 15 hours since full charge. This is connected to WiFi all day. I think it got worse from AUB6 - > AUB8
[Samsung Galaxy S21 Questions] Levisaurus:
Updated to AUB8 2 days ago, the phone still can't hold a charge when on LTE, still sticking to 3G to make it last a day
[Samsung Galaxy S21 Questions] blinkin:
Same here. I tried out turning off aod but it didn't change anything. It's definitely 4g/5g
[Samsung Galaxy S21 Questions] ivor987:
Got AUB8 couple days ago here in Croatia, battery is the same or even worse. Max 4 hrs SOT...
[Samsung Galaxy S21 Questions] joakimbo:
It's hard to tell.. But I felt the AUB6 update helped a lot with the standby battery drain after the AUB3 update. But now, after AUB8 it's somewhere between again. I can barely use my phone for a couple of hours staying at home connected to WiFi, and I'm down to 85%.

This is with mobile data disabled.. Something is up, don't know what. Considering a factory reset, but I want Samsung to patch up everything first, then do a full clean install.
[Samsung Galaxy S21 Questions] lomastem:
ì meet the same issue here on a S21, running the AUB8.

Done a wipe/factory reset without any results

I have 12/15 hours with a full charge, and i don't go to the 4 hours of SOT.

Plus i notice some unexplainable heating, do you ?
[Samsung Galaxy S21 Questions] blinkin:
No heating here, rest same as you
[Samsung Galaxy S21 Questions] joakimbo:
Yeah. Same here. Barely 4 hours SOT. I'm pretty sure I got close to 6 on AUB6.

No heating.. Just too much idle drain.

Attached is screenshot of today. Half of the time on WiFi. Its not good enough for a 4000mah battery. 6 hours which I had earlier is good enough. But this..
[Samsung Galaxy S21 Questions] joakimbo:
Do you use any social media apps? Snapchat, Facebook, Instagram?
[Samsung Galaxy S21 Questions] blackhawk:
Google Play Services is the culprit as usual...

Get Karma Firewall from Playstore. Firewall block it. Disable autosync on gmail. You briefly need to turn GPlayS for gmail to manual sync but not every time.

Clear GPlayS data.

Block Playstore as well; you need to unblock GPS and Playstore then reboot for Playstore to function.

Block Android Services as well as it constantly wants to poll. Normally doesn't need internet access.

Test configuration.
[Samsung Galaxy S21 Questions] blinkin:
No it's not, I didn't have any problems like this with p30 pro. Besides it's Google os so I expect from Samsung to figure out how to fine-tune everything so that it's not draining battery. On top of that, how would you explain that once 4g is disabled, there is no standby drain?
[Samsung Galaxy S21 Questions] blackhawk:
Meh, *****ing 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🤣
[Samsung Galaxy S21 Questions] joakimbo:
I don't think that's a solution unfortunately. Blocking Google play services sounds like a bad idea. If it's GPS that causes this standby drain, then it must be some wakelock that's causing it, and Samsung should fix this.
[Samsung Galaxy S21 Questions] skyline91:
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?
[Samsung Galaxy S21 Questions] JCMate10:
Agree! If you need to turn any of the fancy stuff off, you might as well spend allot less on last years model or something completely else. I think the Snap Dragon versions are OK - at least it seems the Exynos users are more affected.

Note to self: never buy a phone again, where there are major HW differences depending on where you buy it :)

After buying the Note10+, I actually made a similar note to my self, saying "Never ever buy Samsung". I guess I should have listened to myself :LOL:

I am happy that I was able to return my S21. Even if it has gotten a lot better, it still seems like a big number of users have issues. I will keep monitor this thread a little time yet, before deciding if it makes sense to purchase the S21 again or if it is still a waste of money.
[Samsung Galaxy S21 Questions] blackhawk:
Find out what's tapping the 4G and neutralize that, not the 4G! 4G is all my 10+ uses however it behaves the same way if steps aren't taken.

Easier said then done... but it runs nicely once it's been done.

This is one of the reasons I stay with Pie. It's a faster OS and diagnostics are easier than with Q on a stock phone. Q is a mess.
[Samsung Galaxy S21 Questions] blackhawk:
My Snapdragon AT&T 10+ variant was a hot running hog after the first week. Snapdragon variants are far from immune.

After a lot of work it's a cool running, fast, very stable, trouble free platform.

Power management is completely turned off; not needed or desirable as it caused erratic behavior and excess battery consumption on this variant.

What was left had to be sorted out and dealt with one by one. Most of the common battery saving tips you can find were useless. Flipping a couple toggles doesn't do it...

Karma Firewall not only can reduce battery drain, it makes the phone more secure. Misbehaving apks are easy to spot. With Pie it's logging functionality is retained. With Q apperantly you lose that.

Karma uses almost no battery, the most battery friendly VPN firewall I've ever used by a factor of 3-5X or better.

The only reason it's usage is this high was I opened it to view it, otherwise it be even lower!
[Samsung Galaxy S21 Questions] joakimbo:
After AUB8 I get high idle drain even if 4G is turned off. Tried the past couple of days with bixby routines turning off mobile data when at home. Still high idle drain at home.
[Samsung Galaxy S21 Questions] JCMate10:
I am happy that you found a solution. I would personally never, ever spend time doing what you have done. I expect this to be done by the phone vendor and app developers. My phone had these issues on a clean setup, so I obviously expect that this huge effort you have done shouldn't be needed. If this is needed, the product is not mature for sale - I really believe it's that simple.
[Samsung Galaxy S21 Questions] skyline91:
I agree with you. I came to that point when i want to have good phone out of the box, without installing custom rom, kernel, gcam, etc. Before this phone i had Xiaomi MI9 SE and we had experienced developer who rewrited xiaomi crappy kernel, he said that kernel was mess, that monkeys would write better code. But hey, that phone was 50% cheaper than S21.

I had battery drain even in safe mode with 4G, so it's obvious that has nothing to do with installed apps.
[Samsung Galaxy S21 Questions] JCMate10:
In some cases this can be fun. In other cases, not so. I am sure it is great fun having a very old car, where you can spend one hour adjusting stuff after driving it for 15 minutes - but your primary car needs to work when you turn the key, correct? 😀

A flagship phone should be able to sail... This ship seems to have a few holes below deck 😂
[Samsung Galaxy S21 Questions] lomastem:
this is what i get as values as idle with all apps closed, wifi bluetooth ans lte on, location off, screen adaptatif 120.

SM G991B AUB8

I do not loose very much when standby, approx 8/10% in 7/8 hours. But as soon as turn on it's draining.

NB : the 33,7° celsius, i was testing on a youtube video HD few seconds before doing the screenshot, does heat more than when browsing on chrome or instagram.

i don't really know how to read those values, -200mah / -340mah does it talk to someone here ?
[Samsung Galaxy S21 Questions] dantk:
poor boys :)) still buying samsuck devices... some peoples grow up when have 60 y; some oters never
[Samsung Galaxy S21 Questions] lomastem:
And others even wiser do still hang on samsung mobile related thread :)
[Samsung Galaxy S21 Questions] dantk:
buy a poco or xiaomi and u will be proud...im proud already :D battery is far better than much samsucks
[Samsung Galaxy S21 Questions] skyline91:
hehe if you wanna buy 6,81" brick, you could do that.. but there aren't many "compact" phones today, for me choice was either pixel 5 or samsung s21
[Samsung Galaxy S21 Questions] DarthGeorge:
Exact same situation for me, Pixel 5 or S21. I ended up with the S21 but it would be fine either way. Regarding battery life is was only bad with the second february update, after (and before) that, quite happy (6h SOT).

And please, dont feed the trolls. If he needs this post to feel ok with with phone... well, that's everything we need to know.
[Samsung Galaxy S21 Questions] avatar_ro:
My issue was always with the overnight drain. The last update did not improve anything for me.

What you see above is a great result but only achieved disabling VOLTE OFF, DATA ON, WIFI ON.

Basically you need to cripple your 1300 EURO/USD phone in order to have a normal standby drain.

I am using dual sim. 1 Normal Sim and 1 eSim.

I am so dissapointed that I have to disable tech in order to achieve something.

edit: Phone is S21 Ultra 5G Exynos
[Samsung Galaxy S21 Questions] mtm1401:
I don't think it's necessarily 4G (unless you have bad signal and there's no cure for that). There is typically a small difference between WiFi and mobile data, but it all depends on signal strength.

What is causing my issue (and others) is when the phone is moving with the screen off, there is a wakelock 'cameraservice_worker' under android system.

The wakelock only occurs when the phone is moving and screen is off, causing bad standby drain. Typically speaking, if you're on WiFi, you're at home or stationary, if you're on 4g you tend to be out and about, phone is in your pocket moving around, so it feels like 4G drain.

I would suggest using Better battery stats or GSAM battery monitor (you will need to enable via ADB) and if this is the issue, report it to Samsung directly. The wakelock only appears to be occurring on the Note 20 ultra and the s21 ultra.
[Samsung Galaxy S21 Questions] skyline91:
I have good signal here, i tried to put sim card in other phone (Xiaomi MI A2 lite) and there is no drain with 4G. Since i work from home, phone is connected to WIFI and data. Most of the time it is lying on my desk. And i'm talking about S21 exynos version. First image is my battery life with 3G and second is with 4G.
[Samsung Galaxy S21 Questions] mtm1401:
I take it back, strange that the drain would happen whilst on WiFi, as usually this turns off mobile data unless you chose to keep it on. Definitely worth reporting to Samsung.

As a potential short term fix, set up a Bixby routine to switch to 2g when you're connected to home WiFi. Appreciate its not perfect but should help till Samsung fix
[Samsung Galaxy S21 Questions] blinkin:
I tried to set it up but no success. Do you have a recipe for that?
[Samsung Galaxy S21 Questions] mtm1401:
Sure - also can't see the WiFi calling in your screeshots, that makes a big difference.

First time you disconnect from your WiFi you may need to turn things on, but after the that it should work automagically
[Samsung Galaxy S21 Questions] dantk:
depend for uat u need da fon; i bought coz i can read many more text, video, etc,and battery +10 sot... so dont need compact; if i need compact i buy nokia 1100 :))