Database Develop

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 BLU R1 HD can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

Must use Blu charger. Otherwise, charging speed will be 30% lower. I checked with Ampere. Using Blu charger, can charge from 10-100 in about ~2 hours. Not bad.

My experience has been different. If you're heavily using the phone (google maps for navigation for example) the battery will barely charge and it will get very hot. The phone maintains charge well, however charging it up is definitely a 3-4 hour process, if I plug it in for 15 minutes with no use it's about 5-10% on the battery max. I did not find the charger that came with the phone to be any different than most other chargers I had lying around, same charge time (most were higher amperage anyway, being throttled by the phone regardless).

3 because it does charge very slowly, even compared to older non fast charge phones I've had, I think I read that it maxes out at [email protected] which is quite slow.
It's not as big of a deal as the battery life is excellent and it was only $60, but you can't get around calling the charging slow

Definitely limited charging speed, if I use a Samsung 2 amp charger im looking at about 3.5 hours to max charge, whats weird is I used a Samsung 1 amp charger and achieved full charge from 8% to full in just under 2 hours. How does a manufacturer cripple charging port?? -_-

kal250 said:
Definitely limited charging speed, if I use a Samsung 2 amp charger im looking at about 3.5 hours to max charge, whats weird is I used a Samsung 1 amp charger and achieved full charge from 8% to full in just under 2 hours. How does a manufacturer cripple charging port?? -_-
Click to expand...
Click to collapse
Yes, that's why I said you have to use the Blu charger. I have no idea how they cripple it.

waingro808 said:
Yes, that's why I said you have to use the Blu charger. I have no idea how they cripple it.
Click to expand...
Click to collapse
Here's how long it took to charge my R1 HD from 1% until 100% with the Wi-Fi on and radio on. 2 hours and 39 minutes...
Standard BLU charger and cable used.
It's really crappy that BLU somehow cripples the charging time if you choose to use a different charger or cable.
That's got to be the thing I hate the most about this phone. Sigh....

I just got his phone and while I work I stream videos and music all day long at my desk. I keep the phone plugged in the entire time and I've noticed the battery percentage will only increase 1% per hour while charging & using the phone at the same time. Previously I was using the iPhone 6s doing the same thing, it charged 100% quickly. But with nothing changing on the iPhone 7 I switched to android on a cheap phone while I wait for the Samsung Galaxy S8

How does the device behave with Power Banks or 2.1 V outputs?

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 LG V20 can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

I use Ampere to see the rate I am getting. First plug in might only be 90 mah. I unplug, replug, it jumps up to 350. A couple more times and I end up at 900-1200. Screen off and let it fast charge.

I recently tried out the HTC Bolt for a couple weeks and it seemed to charge much faster than my V20. Shouldn't it be the other way around since the Bolt uses quick charging 2.0 while the V20 uses Quick charging 3.0?

Slowest charging phone i ever owned but i still love it lol

My H910 charges relatively quickly. Just plugged it into a quickcharge 2.0, not 3.0 car charger and it went from 16% to 50% in ~25 minutes.

I regularly get rates of 1.8A or greater using a CHOETECH or Anker charger. One its above 80%, it drops down, but this is normal.
The Anker is QC3.0 and the CHOETECH are QC2.0

pgag said:
Slowest charging phone i ever owned but i still love it lol
Click to expand...
Click to collapse
agree, LOL
even my old G2 get 50% battery in half an hour.
what's with V20?
it uses QC 3.0, but charge slower.
I use original V20 charger, and when charging the status is "quick charging.."
it takes 2 hours from 27% to 100%
:sad

argcargv said:
agree, LOL
even my old G2 get 50% battery in half an hour.
what's with V20?
it uses QC 3.0, but charge slower.
I use original V20 charger, and when charging the status is "quick charging.."
it takes 2 hours from 27% to 100%
:sad
Click to expand...
Click to collapse
looks like something really wrong with your phone. My phone usually takes about 75 mins to charge from 0% to 100%

spiderx_mm said:
looks like something really wrong with your phone. My phone usually takes about 75 mins to charge from 0% to 100%
Click to expand...
Click to collapse
maybe, but it looks like not just me though.
and btw, my LG G2 can do full charge in 1 hour and 20 mins (80 minutes), and it's not even QC 3.0
I read somewhere in gsmarena, QC 3.0 should charge to 80% in 30 mins

argcargv said:
maybe, but it looks like not just me though.
and btw, my LG G2 can do full charge in 1 hour and 20 mins (80 minutes), and it's not even QC 3.0
I read somewhere in gsmarena, QC 3.0 should charge to 80% in 30 mins
Click to expand...
Click to collapse
not sure about G2. I've never had one.
QC 3.0 might be able to do it technically, but I've never seen a phone that fast in charging yet. Not even the OP3T which every body is saying quickest in charging.

spiderx_mm said:
not sure about G2. I've never had one.
QC 3.0 might be able to do it technically, but I've never seen a phone that fast in charging yet. Not even the OP3T which every body is saying quickest in charging.
Click to expand...
Click to collapse
Hmm.. okay.
How about your G Flex2? how long it would take to charge to 100%?
G Flex2's battery 3000mAh, right? Same as G2

argcargv said:
Hmm.. okay.
How about your G Flex2? how long it would take to charge to 100%?
G Flex2's battery 3000mAh, right? Same as G2
Click to expand...
Click to collapse
That grandpa tooks around 2+ hrs to get full charge
But to be fair with the phone, I've never used the original charger of G Flex 2 to charge. I either used my old chargers from previous phones or I plugged it into my laptop to charge it. Let me find the original charger and try it when i get back home

Great
Very fast charge

Delete please.

I have absolutely no complaints with the charging speed. Also, I rarely drop below 40%.

My battery takes forever to charge up!
I just bought a VS995 Verizon Unlocked off the net. Was classified as "almost new - open box", hope I did NOT get a unit with problems. Re-charged it now a total of 5 times and on average (plus or minus 3-5 minutes) it takes approx. 3 hours and 18 minutes. for a full charge 0% to 100% . A few thoughts and questions came to mind while reading all your excellent posts:
1.) I believe he must of lost his quick charger because the one he gave me seems like he bought it off the net. Standard USB charger. So probably not using the quick charge function feature of this phone correct?
2.) Can I goto an electronics store and just copy whatever voltage and amps I need to perform a quick charge? Can someone please POST what the voltages and amps needed for a quick charge 3.0 please.
3.) Anyone have a bad battery or have one go bad after using the wrong charging devices? I was thinking of ordering a new battery BUT they are a little pricey. Anyone know some good outlets to buy them at a fair price?
4.) Does rooting the device and putting one of the ROM's on their cell solve anyone's battery problem? If so which ROM do you recommend?
Overall that is my only gripe about the phone. I love the DAC and for all you music lovers out there try Sirius XM on the LG-V20 and make sure to use Hi-Fi made headphones. I bought myself Bowers and Wilkens P7's, sort of pricey but worth it to me. The other thing is Napster as well the songs you download sound awesome with this DAC. For both of these APPS make sure you go into settings and adjust the quality of the downloads and streaming. Otherwise you could be listening to it with poor quality settings from the get go.
Ok well I appreciate any help or advice on my battery situation!
Thanks in advance to anyone helping me out.
--- Gary

FastRedTesla said:
I just bought a VS995 Verizon Unlocked off the net. Was classified as "almost new - open box", hope I did NOT get a unit with problems. Re-charged it now a total of 5 times and on average (plus or minus 3-5 minutes) it takes approx. 3 hours and 18 minutes. for a full charge 0% to 100% . A few thoughts and questions came to mind while reading all your excellent posts:
1.) I believe he must of lost his quick charger because the one he gave me seems like he bought it off the net. Standard USB charger. So probably not using the quick charge function feature of this phone correct?
2.) Can I goto an electronics store and just copy whatever voltage and amps I need to perform a quick charge? Can someone please POST what the voltages and amps needed for a quick charge 3.0 please.
3.) Anyone have a bad battery or have one go bad after using the wrong charging devices? I was thinking of ordering a new battery BUT they are a little pricey. Anyone know some good outlets to buy them at a fair price?
4.) Does rooting the device and putting one of the ROM's on their cell solve anyone's battery problem? If so which ROM do you recommend?
Overall that is my only gripe about the phone. I love the DAC and for all you music lovers out there try Sirius XM on the LG-V20 and make sure to use Hi-Fi made headphones. I bought myself Bowers and Wilkens P7's, sort of pricey but worth it to me. The other thing is Napster as well the songs you download sound awesome with this DAC. For both of these APPS make sure you go into settings and adjust the quality of the downloads and streaming. Otherwise you could be listening to it with poor quality settings from the get go.
Ok well I appreciate any help or advice on my battery situation!
Thanks in advance to anyone helping me out.
--- Gary
Click to expand...
Click to collapse
Any charger that says Quick Charge 3.0 would work. I think even QC 2.0 would charge at the same speed, but just less energy efficient.

The difference between qc 2 and 3 is 3 has a variable voltage allowing it to use energy more efficiently.
Excess energy is lost as heat on qc2, the power is reduced in qc3 when the battery starts to get full.
The charge time is the same.
Specs for QC 2 is 5V / 9V/ 12V, specs for QC 3 is
3.2v - 20v dynamic
Sent from my LG-H918 using XDA-Developers Legacy app

[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
Click to expand...
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
Click to expand...
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.

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 Xiaomi Poco F2 Pro (Redmi K30 Pro) can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

With the supplied charger and cable the charging time is very impressive ("Turbo Charge") with a normal QC3.0 charger charge time is still very good but comparable to most other QC3.0 devices.
Something to note is the device does get noticeably warm when using the supplied charger in the "Turbo Charge" mode.

Takes about an hour for me with included charger.

murakh said:
With the supplied charger and cable the charging time is very impressive ("Turbo Charge") with a normal QC3.0 charger charge time is still very good but comparable to most other QC3.0 devices.
Something to note is the device does get noticeably warm when using the supplied charger in the "Turbo Charge" mode.
Click to expand...
Click to collapse
yes i noticed it get warm to hot-ish
isn't that bad for the battery?
moreover i noticed that if you charge while turned off it does not get hot

itti_sam said:
yes i noticed it get warm to hot-ish
isn't that bad for the battery?
moreover i noticed that if you charge while turned off it does not get hot
Click to expand...
Click to collapse
That's normal because you're not using it, if using while charging it will be hot as your running apps, tasks etc... at the same time. This will increase the heat as sensors will be running also.

Has anyone tried to use other cables that has the same turbo charge effect like the included cable? The included cable is too short, usually I use 2 meters long cable.
I have tried the baseus 5A 40W cable but it only support quick charging and not turbo.

I've tested charging wattage using original 33W charger and original USB cable via specialized USB tester, and I noticed it provides only 25W (about 9.6V/2.65A). It shows "Turbo Charge" indeed, but it's still only 75% efficient. Anyone care to explain this? Is this normal? I've read that only Zoom edition can be charged at 33W, so I expected non-Zoom edition will charge at least with 30W. I tried two other USB cables, and still only 25W. Later today I will try to charge it with Blitzwolf 30W PD charger and see how it goes with that one...

I haven't really tested charge speeds. So far the battery life has been exceptional and the main reason I opted for this phone without the high res screen and refresh rate, as see battery as more essential. I would much prefer charging at a slow speed to preserve battery life. A good app for this is AccuBattery. It measures how many mAh's being charged and discharged after each charge and keeps a graph. It will estimate battery health also.

Yeah I know about AccuBattery, I've been using it in the past. But a real physical tester device is always more precise. I do sw/hw development for a living so I know for a fact. Indeed, battery life is very good because optimized MIUI and pretty big battery, but it would be even better if charging speed was also up to the specs. Meanwhile I've tested charging speed using Blitzwolf 30W PD2.0 charger (K30Pro should support PD3.0 and be backward compatible), and situation is even worse - only about 15-16W at QC3.0 I believe. So no Turbo Charge was initiated. I mean 25W with original charger is still good, but I expected advertised charging speed. I'll do more tests when I catch some time.

Thats normal, because it don't charge all the time with 30W. Compare it with WARP Charge 30T it is faster. OnePlus 8 got 30W and 4300 mAh, F2 Pro is faster with bigger bettery but it's almost the same.
How old is your Blitzwolf charger?

I know it shouldn't charge @30W above 80-90%, but sure it should at 20-ish where I'm at about now. It's also not even cool to the touch, so there's no apparent reason to slow it to 25W. My Blitzwolf charger is about a year old, but I only used it couple of times, so it should be as good as new.

itti_sam said:
yes i noticed it get warm to hot-ish
isn't that bad for the battery?
moreover i noticed that if you charge while turned off it does not get hot
Click to expand...
Click to collapse
Batteries don't like heat but it is actively monitored and it will slow down charging when it crosses temperature threshold.

That's why I mentioned my phone is not even cool to the touch (let alone hot), so my case is not temperature related. I'll try to charge it while turned off, though it was pretty much in idle doing nothing when I did the test, ie. not stressed at all by any factor. All in all, I mean if everyone else gets 25W out of original charger, I won't bother anymore. Also, if it charges from 10-90% in around 1 hour, I won't waste any more time on this either, since it's good enough for me. I was just curious why it charges at 25W, when 30W (and 33W for Zoom edition) was advertised. Altough it wouldn't be the first time something was advertised at launch, and not achievable in real-case scenario.

Burs said:
I'll try to charge it while turned off...
Click to expand...
Click to collapse
Fun fact: phone doesn't charge when powered off?! That's a first. Is it just me, or am I getting too old? For the whole time I'm talking about my Redmi, not to confuse it with Poco, if that matters at all. Maybe Poco works differently.

On my Huawei device you also can not turn off an charge but this starts with Android 10.

takes about 1 hour and 20 minutes for me, I think the high temperature here, summer season, is the reason for this slow charging speed.

From 20-100% in about an hour. Few minutes less actually. Battery is big, that's all ok.

F2 turn off and are dead with 0% (can't turn on). Timer 60 min. and after 60 min. I got 96% with original charger. The phone don't turn on, like it always do.
@Burs a friend told me "on my Anker charger I only can use PD over the third usb port, with the type c port it will charge over QC 3.0 and not over PD" maybe thats why you get ~16W?

When my Redmi was turned off completey, it was hooked up to my USB tester for about a minute. I doubt it would trigger after some minutes, and only then start charging. For the whole time it was connected, I was getting 5V / 0.015A readings on the display. That's pretty much USB tester drawing the power from the phone battery, not the charger! So that would mean charging was completely disabled making the phone behave as a power bank lol. Weird enough, right?
My Blitzwolf charger has only two ports. One PD2.0 (USB-C) and one QC3.0 (USB-A). I've tried three sets of USB cables (one even 5A) on both ports, and best I could get out of it was about 15W. I think I'll have to order another one with PD3.0 and Turbo Charge compatibility.

Heh I'm planning on just using my old 1A slow chargers because they're dotted around the house and work, will probably not even plug fast charger in. Magnetic cables are just so convenient.

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.
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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.
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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.
Click to expand...
Click to collapse
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.