Original topic:

UPDATED: Resolve S20 FE (Exynos) Battery Drain and Heat Issue

(Topic created on: 08-13-2021 01:12 PM)
Swetabh_Singh
Active Level 7
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Galaxy S
Hey guys... the S20 FE battery drain issue had been completely resolved also leading to reduction in Heat issue. (Thanks to miki_patak on reddit to find this out)


The actual culprit is (*drumroll please*) Device Care app.

  • Just turn off Unused apps to sleep, and remove all the Sleeping and deep sleeping apps from the list.
  • Also turn off the Adaptive battery.
(For people who had newly bought the device or have factory resetted it kindly wait till the phone learns your battery usage pattern and also the Background Usage Limit segregrates the sleeping and deep sleeping apps for itself... it will take time.. but have patience... and once done, kindly follow the abovementioned procedures.)

Doing so the samsung background services Keeping the apps in sleep and deep sleep will not kick in because of which the Stock Android OS Scheduler will give a massive bump in battery and reduction in heat.

For me i was getting a 4 hour of SOT on my S20 FE exynos... doing so it bumped to 7-8 hrs... and i have been on 120Hz all the time with wifi, data, location etc on..


(Those wonder how it works then the Adaptive Battery from AOSP puts apps in according to usage patterns. There are defined mathematical algorithms that are used for this. Issue is OEMs (in this case Samsung) are allowed to modify those algorithms to be more aggressive. Samsung tuned something wrong and it's over aggressive which leads to some core Android services being blocked from triggering. OS scheduler than tries to do same thing over and over again and because it fails, it keeps itself in endless loop. It's waisting CPU cycles and battery. Since as you know the Android System has wakelocks. So those wakelocks are here because system tries something, Samsung algorithm blocks it, than system tries again and again depleting the battery causing drain and heat)

P.S. you can try this on any A, S, Note series device. Since for me its working wonders... also if you try kindly tellme about your device response in comments...

Have a Nice Day..




Works for 
M21 (Exynos 9611)

Doesn't work for
S20 FE (Snapdragon Verison)
A52
S20+
41 Comments
AlphaTrion
Active Level 6
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Galaxy S
Does it actually work?
Gonna try it anyway on my device
Swetabh_Singh
Active Level 7
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Galaxy S
Yes it does for me... like i use to get 4-4:30 Hrs of SoT... and right now my phone is running cool and i got 4hrs of SoT just with 50 Percent..
rajesh12124545
Active Level 6
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Galaxy S
Does this method further improve 5g versions battery life?
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Swetabh_Singh
Active Level 7
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Galaxy S
Yep i guess it will... mine is Exynos Version... it got massive increment of 60-70% as i am an heavy user... which is a big deal..
rajesh12124545
Active Level 6
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Galaxy S
If the solution was so easy why did samsung developers didn't noticed and updated in the so called featureless monthly updates
Swetabh_Singh
Active Level 7
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Galaxy S
Ask samsungzz.. howcome i know why they didn't do that? 😅😅
rajesh12124545
Active Level 6
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Galaxy S
I did not asked you. I was discussing this issue here . I know that samsung is not working based on your inputs and updates you first .actually i was blaming samsung for not providing solution if that so easy .
Swetabh_Singh
Active Level 7
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Galaxy S
Oh.. okiee 😁😊
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AlphaTrion
Active Level 6
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Galaxy S
Blame samsung for that. They think they are always perfect and everything they do is perfect. Which is why, probably they think this "device care" battery saving thing which they have made is also perfect.

And when some user reports error or gives an idea for solution, they simply think that their user is doing something wrong.