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Charging speed

To power up, you consume Red Bull. But your phone just needs its adaptive fast charger. Rate this thread to express how quickly the Google Pixel 2 can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

I am horrifically disappointed in this device's charging speed.

I was very pleasantly surprised by how fast this phone charges, untill the past few days. Now all the sudden it seems very average. "Charging Rapidly" is not anywhere near as impressive now as it was. Has anyone else experienced this? I want to figure out if it's just the phone (I have seen other slow charging complaints but not this specifically), or if I caused it.
I installed that stock kernel with security pass patch, twrp beta1, Magisk 14.4.2, and Viper4Arise. Pretty confident that it's not any of those things, but everything else is pretty standard.
This is the case with the charger that came with the P2 in box, the older N5x charger, and the usb-c car charger. I know the new P2 one is stronger, but the change is noticable all around.

My 'Charging Rapidly' also does not seem to be all that rapid, using the charger that came in the box and can take quite a while to get to 100%.

Wartickler said:
I am horrifically disappointed in this device's charging speed.
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Click to collapse
what is your best result? I saw some videos comparisons and pixel was the latest one(

josephtaygano said:
what is your best result?
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Click to collapse
It takes hours to get to 100%. I recently got hold of a USB-A to USB-C cable and plugged the phone into my Nexus 6 brick. The difference was astounding. Full charge in about 1.5 hours. It's sickening that I spent the money on this phone only to have it be so disappointing. I'm a diehard Google fanboi but this is ridiculous.

Definitely miss my 1+5 dash charge. Damn that thing was fast.

Some numbers, today I connected my phone at 19% with stock charger.
- 30 min charge: 19% to 56%
- 40 min charge: 19% to 67%
I don't think that's bad, it's definitely not FAST, nor regular. But considering all the issues the 6P had with batteries, I don't really want to charge my battery in less than one hour. (Specially now that the phone has at least 3 years of updates, I'd like to have 90% of battery life or more in 3 years)
I'll have to do another test, something like from 35% to 80% (this would be more real life, I only need a 2nd charge when I'm traveling in a city with a power bank, using Maps and Camera all the time).
Ultra fast charging and wireless charging are some of the features that I care less in the phone. I want some fast charging between 30% and 90%, but I don't require it to be extremely fast.
TL : DR: If you value an ultra fast charging over other things in a phone, definitely skip the Pixel 2.

p2's charging current is capped at 2700ma (could be up to around 3200ma by kernel hax), meanwhile high battery temperature (over 45 Celsius degrees) and others things such as screen state will cap the current more (half or more)
Without those restricts, fully charge time should be around a hour.

cesarblackwind said:
yeah, around 2 hours 40 mins. really long(
oneplus 5 phone is doing from 0 to 100 for 1 hour 18 mins)
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Click to collapse
wow, almost 3 hours. it's really long

Question about fast charging

Hi everyone, I'm new here with my Note 9 coming from a Galaxy S5. I have 2 questions.
I want to know firstly what (wired) charging do the majority of Galaxy Note 9 owners employ? Standard or fast charging? I am very weary of fast charging because of increased battery degradation.
My second question is this. I am assuming that fast charging increases battery degradation because of increased heat from the higher voltages. And yes I know that it is adaptive and gradually tapers off. I have run an experiment. I have installed a couple of battery temperature apps and charged through standard charging. Then I have put the phone on a solid piece of steel plate and charged through fast charging. The temperatures of the battery are identical. I have checked this a number of times. The steel plate even at room temperature is quite cold.
So does this mean that if I fast charge with the phone on a cold steel plate and the temperature is no higher than standard charging resting on a usual surface, that fast charging in this case causes no additional battery degradation?
Thanks.

Fast charging, most of the time

Fast wireless charging all the time. Even when it's in my car dock it wirelessly charges in that can be for 3-4 hours a day on and off depending on journey. Screw battery degradation I'll use the upgrade programme to upgrade next year.

Slow charging. I have the same concern as you hence I off the fast charging function. No diff to me since I charge my phone only at night when I am about to sleep. Do not require charging to be fast.

BlackCatSam said:
Hi everyone, I'm new here with my Note 9 coming from a Galaxy S5. I have 2 questions.
I want to know firstly what (wired) charging do the majority of Galaxy Note 9 owners employ? Standard or fast charging? I am very weary of fast charging because of increased battery degradation.
My second question is this. I am assuming that fast charging increases battery degradation because of increased heat from the higher voltages. And yes I know that it is adaptive and gradually tapers off. I have run an experiment. I have installed a couple of battery temperature apps and charged through standard charging. Then I have put the phone on a solid piece of steel plate and charged through fast charging. The temperatures of the battery are identical. I have checked this a number of times. The steel plate even at room temperature is quite cold.
So does this mean that if I fast charge with the phone on a cold steel plate and the temperature is no higher than standard charging resting on a usual surface, that fast charging in this case causes no additional battery degradation?
Thanks.
Click to expand...
Click to collapse
If you plan on keeping your Note 9 as long as you did your S5 then slow charge with wire and also try your best to charge from 40 -80%.
Sent from my SM-N960U1 using Tapatalk

Samsung is claiming 95% battery charge capacity after 2 years (80% is normal). So there is little reason to hold charging to 40 -80% for the normal lifetime of a phone. And also LION batteries are never allowed to charge or discharge completely - it's hazardous. So Samsung is already limiting how much power the phone can draw or charge the battery. (So do electric car manufacturers)

^^^Interesting...

hankvb said:
Samsung is claiming 95% battery charge capacity after 2 years (80% is normal). So there is little reason to hold charging to 40 -80% for the normal lifetime of a phone. And also LION batteries are never allowed to charge or discharge completely - it's hazardous. So Samsung is already limiting how much power the phone can draw or charge the battery. (So do electric car manufacturers)
Click to expand...
Click to collapse
A quote is worthless without a source, where did you hear Samsung state the phone would have 95% battery charge capacity after 2 years? Also I'm not sure you understand Li-ion batteries, they are allowed to be fully charged but not completely discharged, this is included in the mAh ratings. Also electric car manufacturers do infact recommend something similar to 40 - 80% charging, for example, Tesla by default do not charge 100%. Even Elon Musk recommends 30 - 80% charging: https://twitter.com/elonmusk/status/448466037441179649

I use slow charging. I believe it is quite fast even with slow charging.
If there is an option to choose whether you want fast and slow charging, note that fast one has some downsides.

A quote is worthless without a source, where did you hear Samsung state the phone would have 95% battery charge capacity after 2 years? Also I'm not sure you understand Li-ion batteries, they are allowed to be fully charged but not completely discharged, this is included in the mAh ratings. Also electric car manufacturers do infact recommend something similar to 40 - 80% charging, for example, Tesla by default do not charge 100%. Even Elon Musk recommends 30 - 80% charging:
Wow took 5 seconds to find many reports of the Samsung statement.
https://www.notebookcheck.net/Samsu...ain-95-capacity-after-two-years.244370.0.html

hankvb said:
A quote is worthless without a source, where did you hear Samsung state the phone would have 95% battery charge capacity after 2 years? Also I'm not sure you understand Li-ion batteries, they are allowed to be fully charged but not completely discharged, this is included in the mAh ratings. Also electric car manufacturers do infact recommend something similar to 40 - 80% charging, for example, Tesla by default do not charge 100%. Even Elon Musk recommends 30 - 80% charging:
Wow took 5 seconds to find many reports of the Samsung statement.
https://www.notebookcheck.net/Samsu...ain-95-capacity-after-two-years.244370.0.html
Click to expand...
Click to collapse
Although I don't blindly trust what manufacturers claim, I did however test my wife's note 8 and used accubattery pro on her device from new. Unlike me, she would always topup her phone and also fast wireless charge. After a year prior to her trading her note 8 in for a note 9 I checked the health tab, I know it's not accurate however as a ballpark is stated her battery health was at 97% which isn't pretty bad for 12 months of usage. My note 8 was at 99% using the 40-80 rule approx 90 % of the time. If one was going to keep their device longer than two years I'd still recommend using the 40-80 method to prolong battery life. However most Inc myself upgrade yearly so it's all moot. I just do it (80-40) out of habit.
Sent from my SM-N960U1 using Tapatalk

hankvb said:
A quote is worthless without a source, where did you hear Samsung state the phone would have 95% battery charge capacity after 2 years? Also I'm not sure you understand Li-ion batteries, they are allowed to be fully charged but not completely discharged, this is included in the mAh ratings. Also electric car manufacturers do infact recommend something similar to 40 - 80% charging, for example, Tesla by default do not charge 100%. Even Elon Musk recommends 30 - 80% charging:
Wow took 5 seconds to find many reports of the Samsung statement.
https://www.notebookcheck.net/Samsu...ain-95-capacity-after-two-years.244370.0.html
Click to expand...
Click to collapse
And while I'm thinking of it. Why don't you substantiate your quote??

Phone becoming hot while charging

Hi guys so the note 9 is becoming hot while charging it has started happening the last couple of days. When I first got the phone on release it would never get hot. Any ideas?
Sent from my SM-N960F using Tapatalk

Have you noticed any change in charging times? That heat = wasted electricity which has to come from somewhere. There is only two places that heat could be coming from (afaik) are the processor or battery and it's charging circuity. Could be that the phone is doing a bunch of updates when you plug in the charger, if you have auto updates on or perhaps you had fast charging turned off before.

No updates phone has all connectivity turned off back gets really hot and yesterday the charger stopped charging the phone so I got the charger brick replaced and charges fine but seems very slow to charge and fast battery discharge
Sent from my SM-N960F using Tapatalk

Turn off fast charging. I believe, even normal slow charging is fast compared to iphone 8 plus fast charging.

charging any device while it's on will probably produce some heat.
just seems logical and I don't consider it an issue worth worrying about. it all depends of what your measure of hot is.
if your cable, port and charger are all mint, then all should be good.
if your cat bit the cable then look no further.
your alternative:
shut phone off and charge it.
it won't heat and probably charge in 20-30 mins to full charge from 0%
if it still got hot while charging at off then you may have hardware issue with equipment/phone

bober10113 said:
charging any device while it's on will probably produce some heat.
just seems logical and I don't consider it an issue worth worrying about. it all depends of what your measure of hot is.
if your cable, port and charger are all mint, then all should be good.
if your cat bit the cable then look no further.
your alternative:
shut phone off and charge it.
it won't heat and probably charge in 20-30 mins to full charge from 0%
if it still got hot while charging at off then you may have hardware issue with equipment/phone
Click to expand...
Click to collapse
The heat is caused by the charging process, so the phone should heat up whether it's turned on or not. The voltage has to be dropped from the 5/9V input down to the ~4V that the phone battery charges to and that is not a 100% efficient process. The internal resistance of the battery itself also causes some heat.
Also there's no way you'd charge a Note 9 from 0 - 100% in 20-30 mins. Even factoring in no charging efficiency loss, you're looking at 51 minutes to charge a 15.4Wh battery with the 18W from the Samsung charger.

willhemmens said:
The heat is caused by the charging process, so the phone should heat up whether it's turned on or not. The voltage has to be dropped from the 5/9V input down to the ~4V that the phone battery charges to and that is not a 100% efficient process. The internal resistance of the battery itself also causes some heat.
Also there's no way you'd charge a Note 9 from 0 - 100% in 20-30 mins. Even factoring in no charging efficiency loss, you're looking at 51 minutes to charge a 15.4Wh battery with the 18W from the Samsung charger.
Click to expand...
Click to collapse
I dont need any convincing lol
but the heat we can actually perceive on the phone case while it's on versus it's off is 2 things. dont think we can feel it while it's off. if I crack the phone open and touch the battery then yes obviously.
now for the 0 to a 100 in 20 to 30 mins while phone is off, I'll time it. but I'm pretty sure I'm not off by that much. again I'm not the one needing convincing in this thread.

bober10113 said:
I dont need any convincing lol
but the heat we can actually perceive on the phone case while it's on versus it's off is 2 x things. dont think we can feel it while it's off.
now for the 0 to a 100 in 20 to 30 mins while phone is off, I'll time it. but I'm pretty sure. you should try it. again I'm not the one needing convincing in this thread.
Click to expand...
Click to collapse
Your phone should be almost exactly as hot whether it's turned on and not being used or turned off. The tiny amount of energy it takes to run a phone while it's dozing is nothing compared to the amount of energy dumped into the phones body while it's charging.
I'll happily test it but unless the charger suddenly starts outputting more than twice the rated amount of power into the phone when it is turned off, it's just not physically possible. Not trying to convince you, just trying to correct misinformation.

willhemmens said:
Your phone should be almost exactly as hot whether it's turned on and not being used or turned off. The tiny amount of energy it takes to run a phone while it's dozing is nothing compared to the amount of energy dumped into the phones body while it's charging.
I'll happily test it but unless the charger suddenly starts outputting more than twice the rated amount of power into the phone when it is turned off, it's just not physically possible. Not trying to convince you, just trying to correct misinformation.
Click to expand...
Click to collapse
guess I did need convincing after all.
while powerdoff :
60 min = 81%
and it did get warm
guess we live and learn.
thanks

Mine is becoming a little hot while in wireless charging pad, and after complete the charge (at 100%)

That is normal however it should cool down once your battery level is charged above the 50% mark.

Try installing a battery log app. I use this one and it records battery temp so you can look at that after it is done charging to see how hot it actually got.
https://play.google.com/store/apps/details?id=kr.hwangti.batterylog
Sent from my SM-N960U1 using XDA Labs

Perfectly normal. Especially if you use the phone while charging (don't do that)

[ROG 2 - 8GB/128GB] Battery Charge time with in box charger

Conditions:
-Room with a temperature of 21 C.
-Phone Off.
-Charged the phone from 0% to 100%.
Charge time in 1 hour 5 Min is 60%.
Charge time in 1 hour 39 Min is 86%.
Charge time in 1 hour 50 Min is 93%.
Charge time in 2 hours is 96%.
Charge time in 2 hours 18 Min is 100% Fully charged.

We need the 30w charger

rowihel2012 said:
We need the 30w charger
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Click to collapse
I don't have it, and with such stats I don't think I need one.
It's not worth paying 43 USD (currently the price) to get one.

Rashad83 said:
Conditions:
-Room with a temperature of 21 C.
-Phone Off.
-Charged the phone from 0% to 100%.
Charge time in 1 hour 5 Min is 60%.
Charge time in 1 hour 39 Min is 86%.
Charge time in 1 hour 50 Min is 93%.
Charge time in 2 hours is 96%.
Charge time in 2 hours 18 Min is 100% Fully charged.
Click to expand...
Click to collapse
same ur result. 2h 15 mins.
30w as review was 1 hours 48 mins. Not worst to buy

Can you post all the wallpapers?

MishaalRahman said:
Can you post all the wallpapers?
Click to expand...
Click to collapse
Sure but "setaswall"website already got them.
https://www.setaswall.com/asus-rog-phone-2-stock-wallpapers/

rowihel2012 said:
We need the 30w charger
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Click to collapse
does tencent edition support 30w charger?

asri009 said:
does tencent edition support 30w charger?
Click to expand...
Click to collapse
Of course!

i prefer the 18 w fast charged since it wont degrade the battery as fast as 30 w fast charger. of course a 6000 mah is more difficult to degrade, but the life span will be better with 18w charger
the tencent edition 8/128 is a best buy.. not worth the global 12/512gb . only it has little more bands, all glass body, some new accessory and fast charged. reccomended only for people that use more than 128gb.
128gb is more than enough for me and an almost 1000$ 512gb global model is not giustified!

Alessandro999 said:
i prefer the 18 w fast charged since it wont degrade the battery as fast as 30 w fast charger. of course a 6000 mah is more difficult to degrade, but the life span will be better with 18w charger
the tencent edition 8/128 is a best buy.. not worth the global 12/512gb . only it has little more bands, all glass body, some new accessory and fast charged. reccomended only for people that use more than 128gb.
128gb is more than enough for me and an almost 1000$ 512gb global model is not giustified!
Click to expand...
Click to collapse
Proper fast charging shouldn't degrade a battery any faster than normal charging, as long as it doesn't cause the battery to heat up more than normal or charge to a higher finished voltage than normal. What degrades a battery is charging it to 100% all the time, because that last 5 to 10 percent of the charge is up in the 4.15 to 4.2+ volts per cell, which causes the damage that we see as degradation. If you limited the charge to 80%, or even 90% you'd get a MUCH slower degradation of the battery.

bluegizmo83 said:
Proper fast charging shouldn't degrade a battery any faster than normal charging, as long as it doesn't cause the battery to heat up more than normal or charge to a higher finished voltage than normal. What degrades a battery is charging it to 100% all the time, because that last 5 to 10 percent of the charge is up in the 4.15 to 4.2+ volts per cell, which causes the damage that we see as degradation. If you limited the charge to 80%, or even 90% you'd get a MUCH slower degradation of the battery.
Click to expand...
Click to collapse
∆This∆
And what's nice about the phone is that it gives you a way to mitigate this right from settings. Go to Settings, Battery, PowerMaster, Battery Care. Here you can set times for dynamic charging between hours X and Y to get to 100% instead of as fast as you can. Mine is set 10 pm to 7 am for now.

Any 30W third party compatible?

Using the original supplied battery and cable takes around 4 hours or more, any suggestion???
Why it's taking over 4 hours?? Any way to fix?

kanej2006 said:
Using the original supplied battery and cable takes around 4 hours or more, any suggestion???
Why it's taking over 4 hours?? Any way to fix?
Click to expand...
Click to collapse
It takes 4 hours with the phone off or on. If it's on make sure that scheduled charging isn't activated during the period you try to charge the phone.
If non of what I suggested is useful, it's better you take your device to ASUS service center.

Rashad83 said:
It takes 4 hours with the phone off or on. If it's on make sure that scheduled charging isn't activated during the period you try to charge the phone.
If non of what I suggested is useful, it's better you take your device to ASUS service center.
Click to expand...
Click to collapse
From 50% to 100% takes 4 hours with the phone on.
Scheduled charging was already deactivated.
Could you suggest a better alternative cable & charger that may speed up the charge? Thanks.

kanej2006 said:
From 50% to 100% takes 4 hours with the phone on.
Scheduled charging was already deactivated.
Could you suggest a better alternative cable & charger that may speed up the charge? Thanks.
Click to expand...
Click to collapse
There is a problem with your device battery mate either this or your charger is the issue. From 50% to 100% it shouldn't take more than 1 hour and that's with the default charger that comes with the device itself 18W. Try to charge the device with another charger and compare. Otherwise I advice you to taking it to the service center.

Rashad83 said:
There is a problem with your device battery mate either this or your charger is the issue. From 50% to 100% it shouldn't take more than 1 hour and that's with the default charger that comes with the device itself 18W. Try to charge the device with another charger and compare. Otherwise I advice you to taking it to the service center.
Click to expand...
Click to collapse
Thank you for your advice, I will try charging using my Sony Xperia 1 charger & see if it makes any difference.
Otherwise the battery holds charge very well. I will update you shortly as I've only had the device for 3 days...

I will also order this and see if it helps:
JuicEBitz® 25W 3 Port USB FAST QC3.0 Mains Charger Adapter +
It should provide me with the fastest supported charge. I'll order it next week & once tested I will report back.
---------- Post added at 09:21 PM ---------- Previous post was at 08:53 PM ----------
I already have an update and know what the problem is.
Around 30 minutes back, I had 60% battery. Just now I unplugged it and it was 96%
I used original Sony Xperia 1 18w charger and cable. This means that there is an issue with the supplied Asus charger, it is charging very slowly. The 18W Sony charger is charging much faster than the 30W Asus...

Anyway to charge only to 80% in software? With a 6000 mAh battery, I don't really need to charge to full if I can increase longevity of the battery life.

Question Fast charging, and superfast charging

I have the Samsung 25w charger, and when using it it appears the phone will only either cable charge or superfast charge. It wont also fast charge. I want to maximize the battery life span of the phone, and cable charging is inconveniently slow, and I figured that fast charging would be a happy medium between that and maxing it out. I was under the impression that it's the phone that dictates the rate of charge it will accept from the brick, and the brick only determines the maximum deliverable current. If I understand correctly, we can use samsung's 45w charger, but the phone will obviously only allow 25w from it. I'm puzzled why when using the 25w charger the phone can't just accept 15w when set to only fast charge. Is this a bug?

Hi,
You might plug in your phone, Go to Parameters, Section Battery, Advanced Battery, and activate Super charge and superfast charge in order using fast and supercharge with your 45W charger !

Yes, I've done that. The 25w charger will only super fast charge, but won't just fast charge. I would have thought it could either one, whichever I have it set to do.

if you want fast charge ..... deactivate superfast charge should be the solution ! Isn't it ?

Probably a firmware/software glitch.
Fast charging will not enable if battery temp is too low.
To avoid Li plating the battery temp should be a minimum of 72°F or higher, the preferred minimum is 80°F.
Using the 45 watt brick may shorten battery life.
Fast charging with the 25 watt brick appears to do little damage.
Li's prefer brief, frequent midrange charges ie 40-65%. Avoid discharging below 30% and charging beyond 90% although 80% is a better top limit.

fission6606 said:
if you want fast charge ..... deactivate superfast charge should be the solution ! Isn't it ?
Click to expand...
Click to collapse
No, if you only activate fast charge (with superfast deactivated) and use the 25w brick, the notification in the shade says cable charging, and that takes like 2hrs to charge the phone.

ac42 said:
No, if you only activate fast charge (with superfast deactivated) and use the 25w brick, the notification in the shade says cable charging, and that takes like 2hrs to charge the phone.
Click to expand...
Click to collapse
That doesn't sound like fast charging is active. It should gain about 2%@minute through most of its range except the top end where it goes to about 1%@minute.
When this doesn't work correctly it's a true pain to troubleshoot. My 10+ started dropping out of fast charging prematurely. A new 25 watt brick/cable and trying a lot of other remedies still hasn't fully restored it.

I'm curious if anyone here has a 25w brick that could confirm if this behavior is present globally, or if this is something just on my device? Only activate fast charging in the battery settings, plug the phone in with the 25w charger, and look in the notification shade and see what the charge rate is tagged as. I'd be grateful if someone would confirm this.

blackhawk said:
Probably a firmware/software glitch.
Fast charging will not enable if battery temp is too low.
To avoid Li plating the battery temp should be a minimum of 72°F or higher, the preferred minimum is 80°F.
Using the 45 watt brick may shorten battery life.
Fast charging with the 25 watt brick appears to do little damage.
Li's prefer brief, frequent midrange charges ie 40-65%. Avoid discharging below 30% and charging beyond 90% although 80% is a better top limit.
Click to expand...
Click to collapse
I have noted that you practise the same charging procedures as I have done for several years (and you obviously have done as well). With my Note9 and S8 + I used to not let it drop below 40% if I can avoid it and also not go above 80%. All this is fine and most of this we all probably learned from Battery University and Isadore Buchmann. That all said, and I am really not sure if I am keeping this phone - Decision today or tomorrow - my question comes to the matter of calibration. When I received this phone some 14 days ago I charged it to 100% but thereafter did not run it down to zero but kept it above 40% the whole time. The question I put to you (and others can learn from your response) is there a need to "calibrate" the device initially (ie run down to say 10% for example once a month) as was suggested by Buchmann probably a few years ago?

blackhawk said:
That doesn't sound like fast charging is active. It should gain about 2%@minute through most of its range except the top end where it goes to about 1%@minute.
When this doesn't work correctly it's a true pain to troubleshoot. My 10+ started dropping out of fast charging prematurely. A new 25 watt brick/cable and trying a lot of other remedies still hasn't fully restored it.
Click to expand...
Click to collapse
You and I discussed this earlier. Do you think it is the port that has become damaged? Part of the reason for my getting the wireless charger is my Note 9 is very erratic when it comes to fast charging. Cleaning out the port with a toothbrush/compressed air. rebooting...wiping cache partition, new cable etc never truly fixed it for me. I do feel that when first plugging in the S21 ultra (before going wireless) the connection seemed a lot firmer.

ac42 said:
I'm curious if anyone here has a 25w brick that could confirm if this behavior is present globally, or if this is something just on my device?
Click to expand...
Click to collapse
It does appear to be related to the Samsung 25w brick. I have the one that came with my S20U. It will "Super fast charge" my S21U no problem. If I turn off super fast charging in the phone, it only says "charging" when plugged in, and with my phone @ 65%, it said it would take well over an hour to charge (forgot the exact time). Then I took my phone w/o changing any settings to a generic 18w QC3 brick, and it said "fast charging", and said it would take 44 mins to complete.

Ive seen this same type of issue as well with 2 different chargers. One charger (45w pd) will fast charge with super turned on but not fast, notification only says fast charge. The second (39w qc3) will fast charge with regular fast charging turned on, but turning on super does nothing. Charge times are the same with both chargers on regular charging and fast, with 0 differemce between fast charging and super.

peterg21 said:
You and I discussed this earlier. Do you think it is the port that has become damaged? Part of the reason for my getting the wireless charger is my Note 9 is very erratic when it comes to fast charging. Cleaning out the port with a toothbrush/compressed air. rebooting...wiping cache partition, new cable etc never truly fixed it for me. I do feel that when first plugging in the S21 ultra (before going wireless) the connection seemed a lot firmer.
Click to expand...
Click to collapse
I'm as clueless as you at this point unfortunately.
My port is good, cable/charger, tried hard reset, cleared system/akp caches, did the recall thing and so on.
I'm wondering if it's a battery fault. Do older batteries go into fast charging the same as newer ones? It's almost as if it's throttling the fast charging, sometimes it's full bore then it drops out to 1%@45 seconds then to 1%@minute.
Or is it a calibration ie it thinks it's at 90% when it's only at 70%?
The only I haven't done is a factory reset, lol.
All this started one night when it was slow charged to 100%. WTF?
TFF the curse of technological Beast!
Guess I'll try recall again.

dscline said:
It does appear to be related to the Samsung 25w brick. I have the one that came with my S20U. It will "Super fast charge" my S21U no problem. If I turn off super fast charging in the phone, it only says "charging" when plugged in, and with my phone @ 65%, it said it would take well over an hour to charge (forgot the exact time). Then I took my phone w/o changing any settings to a generic 18w QC3 brick, and it said "fast charging", and said it would take 44 mins to complete.
Click to expand...
Click to collapse
Right on. Sounds like it's not just my phone. That's a relief. It's puzzling why the phone can't also fast charge with that brick. Perhaps it's simply a bug that Samsung either never noticed, or it isn't a priority to them. It would be nice if we could take advantage of the different settings without having to have two different bricks sitting around.

I think I figured it out. The fast charging setting is for the old classic fast charger. If you connect your phone to that one, you'll see it says it's fast charging. If you don't have fast charging turned on, it'll prompt you to turn it on to use that charger at it's maximum capability. If you use one of the newer Samsung C to C bricks, it's going to do the super fast charging.

I am currently using this Baseus charging plug and get full range of charging options - fast / super fast.
Thought I would try some I have hanging around before buying a Samsung one.
Baseus USB C Charger 120 W with GaN Tech Power Delivery USB-C Power Supply Compatible with MacBook Pro/Air, iPad Pro, iPhone 12 Pro Max/11 Pro Max/XS Max, USB C Laptops, Surface Pro, Galaxy, Huawei: Amazon.de: Computer & Accessories
Baseus USB C Charger 120 W with GaN Tech Power Delivery USB-C Power Supply Compatible with MacBook Pro/Air, iPad Pro, iPhone 12 Pro Max/11 Pro Max/XS Max, USB C Laptops, Surface Pro, Galaxy, Huawei: Amazon.de: Computer & Accessories
www.amazon.de

a.gordon1989 said:
Ive seen this same type of issue as well with 2 different chargers. One charger (45w pd) will fast charge with super turned on but not fast, notification only says fast charge. The second (39w qc3) will fast charge with regular fast charging turned on, but turning on super does nothing. Charge times are the same with both chargers on regular charging and fast, with 0 differemce between fast charging and super.
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XDA just covered this in their article:
Fast Charging Explained: The slowest to the fastest Fast Charging technologies
Curious about fast charging? Here's everything you need to know about fast wired charging standards and how to pick the best charger!
www.xda-developers.com
Unless a charger has USB-PD PPS they will only FAST Charge @ 18w with fast charge on (super fast on/off wont matter as it will be off). If you are getting super fast charging then you are getting the expected 25w which is totally fine and not bad for battery. You will get super fast with the samsung 25w adapter and maybe the previous series 45w adapter.

I have a 45W USB-C PD port as part of an Anker PowerPort and also the 18W charger that came with my Pixel 5. Would I notice much of an improvement in charging speed or integrity/longevity of the battery by purchasing Samsung's 25W charger?

Tmel14 said:
I have a 45W USB-C PD port as part of an Anker PowerPort and also the 18W charger that came with my Pixel 5. Would I notice much of an improvement in charging speed or integrity/longevity of the battery by purchasing Samsung's 25W charger?
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No huge charging improvement. It most likely will degrade the battery faster.
I use only the Samsung 25w bricks because they are known good and relatively cheap.
Just picked up a 25w brick and cable for $20.
The amount of trouble a defective charging hardware can cause means I won't consider using 3rd party chargers/cables for fast charging.
Fast charging is a nightmare to troubleshoot as I'm learning now... will see if a couple full 100-0% charge cycles get it or not.
It's time consuming and irritating.

thegr8anand said:
XDA just covered this in their article:
Fast Charging Explained: The slowest to the fastest Fast Charging technologies
Curious about fast charging? Here's everything you need to know about fast wired charging standards and how to pick the best charger!
www.xda-developers.com
Unless a charger has USB-PD PPS they will only FAST Charge @ 18w with fast charge on (super fast on/off wont matter as it will be off). If you are getting super fast charging then you are getting the expected 25w which is totally fine and not bad for battery. You will get super fast with the samsung 25w adapter and maybe the previous series 45w adapter.
Click to expand...
Click to collapse
Thanks for posting the link to that article. It clears some things up. Charging standards have become rather confusing with all the proprietary standards. This makes me feel more comfortable using the 25w super fast setting on the s21 ultra.