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

[Swetabh_Singh]

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+

[Ashutosh7x]

Has your charging time also improved?
How much time with 25W charger?

And thank you for this tip. Gonna try it now..

[Swetabh_Singh]

I actually forgot to note the charging time... but 1 thing i noticed that i use 25 watt charger... and even with that the charging temp was around 29-32°. So i guess it did improved it...


Anyhow will measure the charging time and will let you know..

[Ashutosh7x]

My SOT on 120Hz is usually around 6hrs with Wi-Fi on and location, Bluetooth, mobile data off.
Let me see if I get any improvement.

BTW can't we disable this device care app using adb? 😅

[Anikroyale]

Yep, you can disable using ADB.

[Swetabh_Singh]

Tbh i literally want to kill this Facebook services app.. 🤣 its hogging and i don't even use Facebook...

[Anikroyale]

Use ADB to remove any system app you don't want. Thatxs my secret of pumping more performance than expected on a midrange device lol.

[babatherockstar]

Worst post ever seen. Did not work on s20+

[Anikroyale]

This post is specifically for S20 FE, not S20+. Device care behaves differently on all phones. The same medicine can have different effects on two bodies.

[Swetabh_Singh]

Sorry to hear that but it did worked on s20 FE... i thought maybe it can work on S20...

Here are the Screenshots of Samsung apps overall battery usage in my use case Scenario...

OneUI Home
Before - 5.4%
After - 3.6%

[Swetabh_Singh]

Samsung Pay.
Before - 4hrs 2 min caused 1% battery drain
After - 4 hrs 32 min caused 0.6% battery drain

Keyboard Content Center
Before - 8hrs 6min caused 1.2% battery drain
After - 8hrs caused 0.8% battery drain

And there are other apps such as samsung Core Services, Bixby Voice, Hiya Services etc have massive drop in drain...

It did worked for me... (s20 FE 4g)