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S20FE 4G (Exynos) Charging Speed

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Ashutosh7x

Member
May 15, 2015
24
3
New Delhi
Hi everyone,

I recently purchased S20FE 4G in India. I also purchased a 25W charger from Samsung.
I'm very disappointed with the charging speeds.

I switched off and charged and these are my results:

25W took 1hr25min to charge 5to100%
15W took 1hr38min to charge 5to100%

I even formatted my device but no improvement.

Can you guys mention your charging speeds?
What can I do as service centers are closed due to lockdown.

Thank you.
 

blackhawk

Senior Member
Jun 23, 2020
5,082
1,441
Mine 15W gives upto 1500-1600mAh max then drops to around 1000mAh.

25W fluctuates a lot. Gives around 1100-1200 only
It should hit close to 5000ma at times with 25 w brick in the 20-70% charge range.
In that range you should be seeing 2600-5000ma.
Fast charging will noticeably start ramping down at 70-75% and will completely slow charge after 90%. Best to stop charging at 70-80%.
If the start temperature is too low it will revert to slow charging for the entire cycle.
Best start temp is 85-90°F.
Cool it if it starts getting near 100F.

Use a known good Samsung OEM 25w brick/cable.
Try toggling to fast charging switch on/off 3 times.
Factory resets* will do nothing except waste time.
Clear system cache, try a hard reboot.

Watch for any signs of bulging on the front and especially back of the phone. Li's can fail at any point in their life. A failed Li will fast charge erratically and have reduced capacity. Any swelling means it needs replaced asap before it damages the display or worse.


*a major firmware update is the exception
 

Ashutosh7x

Member
May 15, 2015
24
3
New Delhi
It should hit close to 5000ma at times with 25 w brick in the 20-70% charge range.
In that range you should be seeing 2600-5000ma.
Fast charging will noticeably start ramping down at 70-75% and will completely slow charge after 90%. Best to stop charging at 70-80%.
If the start temperature is too low it will revert to slow charging for the entire cycle.
Best start temp is 85-90°F.
Cool it if it starts getting near 100F.

Use a known good Samsung OEM 25w brick/cable.
Try toggling to fast charging switch on/off 3 times.
Factory resets* will do nothing except waste time.
Clear system cache, try a hard reboot.

Watch for any signs of bulging on the front and especially back of the phone. Li's can fail at any point in their life. A failed Li will fast charge erratically and have reduced capacity. Any swelling means it needs replaced asap before it damages the display or worse.


*a major firmware update is the exception
I'm hoping for a software update to fix this bug. My 25W never goes beyond 4000mAh.
It takes 1hr25min to charge from 5to100% when the mobile is off.

Should I downgrade to March patch using odin?
 

blackhawk

Senior Member
Jun 23, 2020
5,082
1,441
I'm hoping for a software update to fix this bug. My 25W never goes beyond 4000mAh.
It takes 1hr25min to charge from 5to100% when the mobile is off.

Should I downgrade to March patch using odin?

4000 ma is acceptable.
Having the screen on will skew the charge cycle, don't.
It takes much longer to charge past 80%
Temperature parameters can greatly alter fast charging times.

Don't routinely discharge past 20%, 40% is a better cutoff.
Charging to 100% is slow and the most stressful thing you can do to an Li except for... doing a full charge cycle charge (5-100%)🤣

If you're seeing roughly a 2%@min charge most of the time in the 40-70% range it's likely fast charging normally.
 

Ashutosh7x

Member
May 15, 2015
24
3
New Delhi
4000 ma is acceptable.
Having the screen on will skew the charge cycle, don't.
It takes much longer to charge past 80%
Temperature parameters can greatly alter fast charging times.

Don't routinely discharge past 20%, 40% is a better cutoff.
Charging to 100% is slow and the most stressful thing you can do to an Li.
If you're seeing roughly a 2%@min charge most of the time in the 40-70% range it's likely fast charging normally.
I see 1%/min charge. Around 40-70% it increases to 1.5%/min.

Overall charging is slow. I've seen more than 10 owners complain about their S20FE.

It's a software issue after April update in India.
 

blackhawk

Senior Member
Jun 23, 2020
5,082
1,441
I see 1%/min charge. Around 40-70% it increases to 1.5%/min.

Overall charging is slow. I've seen more than 10 owners complain about their S20FE.

It's a software issue after April update in India.
Try reverting Device Care and Device Health Care to factory load.

My Rule #1 if your OS platform is running fast, stable and fulfilling its mission... let it be.
I'm still running my N10+ on Pie, zero issues.
Too many firmware updates skew the stew🤣
 

blackhawk

Senior Member
Jun 23, 2020
5,082
1,441
Haha.. well I'll keep that in mind from now onwards
Yeah I've learned that the hard way more then once! Firmware updates can (and do) cause permanent damage to the device with a reflash being your only recourse. This can get real messy too.

In reality even outdated Android OS's rarely get infected unless you do something really stupid.
Any OS that is Pie or above is immune to the worst rootkits that can cause "unremovable" infections.
As you can see even a factory reset caused by malware be less trouble than a buggy firmware update to fix.

Always backup your critical data at least 2X on 2 or more hdds that are physically and electronically isolated.
Crashes are rare but they happen.
"I lost all my images, help me..." threads are too common here. There's are no magic time machines and no help☠

Was it the boogey man?
What was he wearing?🤣
 

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    Try reverting all Device Care apks to factory load.

    My Rule #1 if your OS platform is running fast, stable and fulfilling its mission... let it be.
    I'm still running my N10+ on Pie, zero issues.
    Too many firmware updates skew the stew🤣
    Haha.. well I'll keep that in mind from now onwards