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Have someone had problems with the fast charging option?

hi, since i got the phone (2 month) i was very surprised because the fast charge, 1 game of lol was enough to get 60% or more, but since last 4 or 5 days, i have noticed that it does not longer charge like before, it used to need around 1 and a 20 min to charge all the battery, but now it takes around 2 hours, like using a normal charger. Thanks, and btw english is not my first language :silly:

Happened to me once, rebooted the phone and fast charging was working again.

4chanz said:
hi, since i got the phone (2 month) i was very surprised because the fast charge, 1 game of lol was enough to get 60% or more, but since last 4 or 5 days, i have noticed that it does not longer charge like before, it used to need around 1 and a 20 min to charge all the battery, but now it takes around 2 hours, like using a normal charger. Thanks, and btw english is not my first language :silly:
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fastcharge works only with screen off and no app opened (es. game/video/music/etc)

Also make sure you using good quality cable. Some weak ones can "block" quick charge. Best setup is just the stock one.

superdioz said:
fastcharge works only with screen off and no app opened (es. game/video/music/etc)
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It still fast charges while in use... just won't be as fast since you're drawing power too. However, using the battery while charging at the same time makes the battery heat up very easily (true for most all devices even on normal 5V/1A chargers) so it is always recommended to keep your device in a state of minimal drain while charging.
I've had issues on past phones where sync/charge cables (stock ones even) get detected as USB connection instead of AC and charge at limited amps because of it. Swapping out to a new stock cable or even a dedicated charge cable with no sync pins usually solves the issue. EDIT: as przemo3679 says below, Qualcomm Quick Charge standard negotiates the higher voltage mode over the data pins, so "charge only" style cords with the data pins missing or shorted will not work in QC mode.

PhantasmRezound said:
It still fast charges while in use... just won't be as fast since you're drawing power too. However, using the battery while charging at the same time makes the battery heat up very easily (true for most all devices even on normal 5V/1A chargers) so it is always recommended to keep your device in a state of minimal drain while charging.
I've had issues on past phones where sync/charge cables (stock ones even) get detected as USB connection instead of AC and charge at limited amps because of it. Swapping out to a new stock cable or even a dedicated charge cable with no sync pins usually solves the issue.
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no, the snapdragon 810 has overheating problems so if the screen is on the fastcharge is disabled, is the same reason because while you play and the phone heat up the display brightness cant be over 75%.

superdioz said:
no, the snapdragon 810 has overheating problems so if the screen is on the fastcharge is disabled, is the same reason because while you play and the phone heat up the display brightness cant be over 75%.
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It does not disable the fast charge simply because the screen is on. That is how you keep phrasing it.
It disables fast charge if the phone is overheating. Technically this is not the same thing.
Many common usage factors (gaming, heavy mobile data use, high screen brightness, etc.) can make the heat build up fast enough to trigger thermal throttling and disable fast charge of course. But it is also possible to tweak the kernel and thermal files and adjust usage (light browsing only, use strong wifi in lieu of mobile radio, reduce screen brightness) to keep the phone in fast charge even when screen is on.

PhantasmRezound said:
It still fast charges while in use... just won't be as fast since you're drawing power too. However, using the battery while charging at the same time makes the battery heat up very easily (true for most all devices even on normal 5V/1A chargers) so it is always recommended to keep your device in a state of minimal drain while charging.
I've had issues on past phones where sync/charge cables (stock ones even) get detected as USB connection instead of AC and charge at limited amps because of it. Swapping out to a new stock cable or even a dedicated charge cable with no sync pins usually solves the issue.
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I disagree. If phone is charging, but not fast it is usually caused by damaged data lanes, or too big resistance on some lane. Cables without sync lanes would work on some devices, but would not on others, current will be limited to 500mA. It's hard to say on which.
And w/o data pins quick charge can't work on any device. Phone use it to communicate with charger to set best voltage and current to actual device.
As i said, original is the best. U can't blame damaged cord for charging issues.

I have a usb voltmeter and I can assure you that it use the 9V charging while the screen is on and also when it's in use (so the screen is on and the phone is in use). The amp only drop when percentage is near complete charging but stay at 9V so technically it still use fast charging.
Quality of the usb cable is very important but quick charge (or fast charge as LG call it) use of higher voltage make the quality less important. I can use a 3 meter usb cable for example, with a iPad charger (5V 2.1A and genuine) I can't even charge my flex 2 (it can't draw more than 300mA and the battery deplete more slowly but don't charge even is not in use). I won't explain why a higher voltage is less sensitive to resistance (the resistance rise with the lenght of the wire) but that's the reason we use high voltage line to transport electricity.

OP here. I use the stock charger and cable that came with the phone, plus they dont see damaged or very used. Still feeling it "slow" :s

I have H950 Stock 5.0.1 , sometimes quick charge doesn't work properly so I turn the power off and charge while off for half an hour it charges very fast and reaches over 70% then turn it back on

Le_Zouave said:
I have a usb voltmeter and I can assure you that it use the 9V charging while the screen is on and also when it's in use (so the screen is on and the phone is in use). The amp only drop when percentage is near complete charging but stay at 9V so technically it still use fast charging.
Quality of the usb cable is very important but quick charge (or fast charge as LG call it) use of higher voltage make the quality less important. I can use a 3 meter usb cable for example, with a iPad charger (5V 2.1A and genuine) I can't even charge my flex 2 (it can't draw more than 300mA and the battery deplete more slowly but don't charge even is not in use). I won't explain why a higher voltage is less sensitive to resistance (the resistance rise with the lenght of the wire) but that's the reason we use high voltage line to transport electricity.
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I agree with You, in short words more current (A) means more temperature. At the same power (W) bigger voltage (V) means lower current (A). But i think u didn't get what i mean. There is some kind mechanism, which block quick charge when cable is too crapy. I had one of those, and it was fully functional witch data lanes, but it was designed to power 0,5A device. When i tried to connect it to the Flex it said slow charging (or something like that). I think it somehow measures resistance.
I also want to refer to your words: "quick charge (or fast charge as LG call it) use of higher voltage make the quality less important". It is advantage of the quick charge, but not main purpose. U can always made a bit thicker lanes. But you can't change connector. Remember that USB 2.0 standard was designed in april 2000, so it is a bit old now . Back in the days nobody was thinking about 5,5" monsters with 3Ah batteries. Flex is charging with around 15W and it is too much(it can dangerously hot, create arcs etc.). Remember that conductor heats up the most in the greatest resistance point, which is connector. Now we have USB type C, with better connector, which can hold on greater currents, but if we have standard, why did not use it (QC2.0 & QC3.0), and have thinner cord?
About charging time, mine from 0-10% to about 90% takes about an hour.

Guys i solved the problem, after noticing that now the animations (rotation, multitasking, and others) werent working, i decided to do a hard reset, now everything is working, fastcharge, animations, etc. not sure what was the cause, a friend told me was a virus for watching porn lol

przemo3679 said:
When i tried to connect it to the Flex it said slow charging (or something like that). I think it somehow measures resistance.
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I see exactly what message you get, it's the same message when you connect to a computer, right?
It detect a computer and limit itself to 5V and 500mA which was the standard back in the time.
I know someone that fried a laptop motherboard with a vaping bypass, so that limit have purpose.
What is strange is if you get that message with a faulty cable and a lg fast charge charger because the charger should only send signal to negociate quick charge.
I don't think it can measure the resistance or the intensity, or at least the measurement is not monitored in some app because when I use a cable with high resistance and the battery percentage don't go up, I don't have that message.

Le_Zouave said:
I see exactly what message you get, it's the same message when you connect to a computer, right?
It detect a computer and limit itself to 5V and 500mA which was the standard back in the time.
I know someone that fried a laptop motherboard with a vaping bypass, so that limit have purpose.
What is strange is if you get that message with a faulty cable and a lg fast charge charger because the charger should only send signal to negociate quick charge.
I don't think it can measure the resistance or the intensity, or at least the measurement is not monitored in some app because when I use a cable with high resistance and the battery percentage don't go up, I don't have that message.
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My bad with translation. If you have no data lanes phone will usually charge with 0.5A as You said, but when i used this crappy one it was something closer to "To maintain best performance use original standardized charger". It was charging faster than 0.5A, but it wasn't QC.

przemo3679 said:
My bad with translation. If you have no data lanes phone will usually charge with 0.5A as You said, but when i used this crappy one it was something closer to "To maintain best performance use original standardized charger". It was charging faster than 0.5A, but it wasn't QC.
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I think you mean the opposite, without the data pin (2 center pin on usb plug) the phone will think he is on a charger and don't limit itself for drawing current even if it's connected to a computer.
Normally a usb device have to be limited to 5V and 500mA,
But qc need the data pin to negotiate the qc voltage so if you use a usb cable without data pin it will stay at 5V.
I have one cable that top at 5V and 100mA (around 80mA normaly) it's very low and it can't charge the phone, it just make it lose battery more slowly, in that case I don't have the message you talk about. That message should appear when it's connected on a computer. My usb voltmeter also have a feature to block data pin, when that feature is activated the message don't pop and it draw more than 500mA from a computer.
There is a good voltmeter on aliexpress, I can make you the link but it's easily recognizable with a transparent blue case, around 10$. There is many model so be sure to take the quick charge compatible. You can make theory on many things but you can truly understand only if you try by yourself.

[q] Wireless Charging Vs Wired Charging - Impact on Battery

Hey guys,
I was looking for some clarification on this topic.
So I heard on a youtube video (can't remember which, for the life of me, I just know it was an S8 video) that Wireless Charging has a better impact on battery in the long run.
They had stated that the battery would continue to hold a better charge over time, where as, if you used wired charging, the amount of charge the battery can hold over time would be much less to when you first got it.
Now I do know that battery gets worse over time, however, I have never heard anything about how wireless charging can increase the longitivtiy of the battery.
Maybe someone on here might have more information on this?
I will try to find that youtube video but if this is the case, then I will definitely need to get a wireless charger.
Regards

Unless this youtuber tested 2 phones for a year, charging one with a cable and another with wireless charging i wouldn't listen to what they're saying.

peachpuff said:
Unless this youtuber tested 2 phones for a year, charging one with a cable and another with wireless charging i wouldn't listen to what they're saying.
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Yeah I agree. A believe a charge cycle is the same regardless of how it is being charged.
Would never think wired charging puts more stress on battery life.

I think though that with wireless charging once the phone is fully charged the pad cuts out so it won't over charge
With a wired connection when the phone is charged its still consistently trying to charge which can end up damage battering the long term

craigels said:
I think though that with wireless charging once the phone is fully charged the pad cuts out so it won't over charge
With a wired connection when the phone is charged its still consistently trying to charge which can end up damage battering the long term
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This is also what I have been wondering. If this is true then I may get a nice wireless pad for charging overnight (maybe the new official samsung "convertible" one but its damn expensive). I would have thought that the phone itself knows when a battery is charged and stops drawing the current from the cable though, so it would make no difference either way if that is true (but perhaps its not?).
But I did hear the exact opposite to op, that wireless charging was worse for the batteries, possibly due to the heat generated. But I don't know how true that is.

True
It's better for the battery because it charges it more slowly than a direct wired connection. There is no more heat buildup than using a wired charger, in fact likely less since the charging rate is lower.
As for the other comment that a wired charger doesn't shut off but keeps charging once the battery is full is patently false. The charging circuits whether wired or wireless are quite intelligent and gradually ramp down the charging current as the battery approaches capacity, ultimately delivering just enough current to keep the phone running. In a closed system the energy has to go somewhere and if the charger didn't do this you'd have 18W of power being dissipated as heat and a serious problem on your hands.

craigdamey said:
It's better for the battery because it charges it more slowly than a direct wired connection. There is no more heat buildup than using a wired charger, in fact likely less since the charging rate is lower.
As for the other comment that a wired charger doesn't shut off but keeps charging once the battery is full is patently false. The charging circuits whether wired or wireless are quite intelligent and gradually ramp down the charging current as the battery approaches capacity, ultimately delivering just enough current to keep the phone running. In a closed system the energy has to go somewhere and if the charger didn't do this you'd have 18W of power being dissipated as heat and a serious problem on your hands.
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For wireless I believe the heat generated is more, it is about the method of delivering the power, not the speed. The induction used to transfer power wirelessly is obviously going to be far less efficient and will generate more heat to get even a slower transfer rate then getting the power straight down a cable (but if someone knows otherwise then feel free to correct me). But then I guess the slower charging rate might also put less stress on the battery which is probably good.
For the wired, what you are basically saying is that leaving a phone plugged in to a wired charger will not harm it since the current will have been reduced in the same way a car battery charger might reduce it to a "maintenance" mode once it is fully charged. So people are believing the old myths that you can overcharge a phone, which would seem to be impossible (although I do wonder why they keep slapping up notifications saying things like "FULLY CHARGED! UNPLUG CABLE!" as if leaving it plugged in would in some way damage it!).
Just saw this which explains the overcharging possibility (or lack of)
http://www.androidauthority.com/leave-phone-plugged-overnight-703078/

ewokuk said:
For wireless I believe the heat generated is more, it is about the method of delivering the power, not the speed. [/url]
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The coils themselves don't generate a significant amount of heat, it's the battery itself that causes the phone to get hot. Slower charging means less heat, which is better for your battery so wireless charging will increase your battery life. As the article notes it is also best to keep your phone above 40% charge, partly because fast chargers slow down significantly after 50% to save the battery. That initial burst from 0-50% is done to save you from a dying battery but it takes its toll.
Also note that the S8/S8+ have new battery technology that provides much improved battery life. They're saying 5% loss of capacity after two years compared to 20% for previous generations.
As a bonus not continuously plugging/unplugging a cable from your USB port will make that last longer too. I hardly ever plug my S7 Edge into a physical cable, and I know quite a few people who have killed their USB ports and can no longer charge and or transfer data from them.

craigdamey said:
The coils themselves don't generate a significant amount of heat, it's the battery itself that causes the phone to get hot. Slower charging means less heat, which is better for your battery so wireless charging will increase your battery life. As the article notes it is also best to keep your phone above 40% charge, partly because fast chargers slow down significantly after 50% to save the battery. That initial burst from 0-50% is done to save you from a dying battery but it takes its toll.
Also note that the S8/S8+ have new battery technology that provides much improved battery life. They're saying 5% loss of capacity after two years compared to 20% for previous generations.
As a bonus not continuously plugging/unplugging a cable from your USB port will make that last longer too. I hardly ever plug my S7 Edge into a physical cable, and I know quite a few people who have killed their USB ports and can no longer charge and or transfer data from them.
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Yeah I am torn at the moment between using cable and getting a wireless charger. I like my stuff charged asap but that's partly because i never leave it plugged in overnight and want it charged before bed (which I now know is not a problem anyway) and partly because i want to be able to unplug it to use it if i get a message or email, which isn't an issue with wireless as I can just pick it up and put it back on there after. I assume taking it off the charging pad and putting it back on will not have any detrimental effects to the battery. I am just trying to weigh up the pros and cons of each. All things considered I am leaning towards wireless, particularly if it isn't worse for the battery (although lets face it the difference in degradation between wireless and wired, is going to be so small it's probably not even noticeable after a couple of years by which time I would have a new phone anyway). I wonder if there is a better wireless charger which will be more future proof than the new convertible samsung one (in case I ditch samsung in future) and still give max speed, I would like one that is tilted so I can see the screen though.
My s5 is 3 years old and has only ever been charged by the massive double width "micro USB" cable which takes some force to get in and out of the socket. Still works perfectly though. Never had any usb port of any kind on any device fail, no idea what these other people are doing to kill them!

ewokuk said:
Yeah I am torn at the moment between using cable and getting a wireless charger.
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Having the dock by my bed is very convenient. Just place it on at night and pick it up during the morning. If I need to grab it for anything I can without getting tangled up in wires and it even sits at the right angle so that the always on display becomes my nightstand clock/alarm clock. Once you've gone wireless you won't go back.

craigdamey said:
Having the dock by my bed is very convenient. Just place it on at night and pick it up during the morning. If I need to grab it for anything I can without getting tangled up in wires and it even sits at the right angle so that the always on display becomes my nightstand clock/alarm clock. Once you've gone wireless you won't go back.
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I always turn my phone off at night anyway so I don't get disturbed by some spam message or something (I know I can probably set it up to be silent at certain times, but then why leave it on at all, using the battery for nothing). £70 for that Samsung charger though!! I know there are much cheaper ones but I am not sure they will charge at the same rate, the new samsung one charges faster than any previous wireless charger AFAIK and I would want one where the phone can sit up, and most are just flat. Hmmmm although the do have it for £50 on amazon sold by "fonejoy", still steep though.
This one looks good https://www.amazon.co.uk/CHOETECH-W...=UTF8&qid=1492192247&sr=1-9&keywords=choetech but not sure if itll charge at the same speed as the new samsung one and doesnt use a USB-C connector which probably rules it out. May as well just get the samsung one.

I use the US version of this and it works fine. https://www.amazon.co.uk/d/Mobile-P...d=1492192742&sr=1-5&keywords=rav+power+qc+2.0. The Fast Charging Dock comes with a cable so that should be all you need.
And yes, I have my Do Not Disturb settings to suppress notifications 10:30PM to 6:30AM. Wife complained she couldn't sleep with all that noise going on

craigdamey said:
I use the US version of this and it works fine. https://www.amazon.co.uk/d/Mobile-P...d=1492192742&sr=1-5&keywords=rav+power+qc+2.0. The Fast Charging Dock comes with a cable so that should be all you need.
And yes, I have my Do Not Disturb settings to suppress notifications 10:30PM to 6:30AM. Wife complained she couldn't sleep with all that noise going on
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Thats a wall charger? I'm talking about the charging pad itself. I believe the new Samsung one outputs 15w so is faster than any previous ones which are all 10w I think.

ewokuk said:
Thats a wall charger? I'm talking about the charging pad itself. I believe the new Samsung one outputs 15w so is faster than any previous ones which are all 10w I think.
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There are only two types of charging dock, standard and fast-charge. None of them output 15W to the phone. The expensive Samsung is just a fancy fast-charge dock so it will charge at the same rate as the Seneo and others that support fast-charge. The Samsung fast-charge adapter only provides a maximum output power of 15W (9V @ 1.67A) so it would require 100% transfer efficiency to charge the phone at that power, and in reality it's only about 65% so at most you'll see 10W versus standard Qi charging at around 7W.
All of the Seneo chargers I have coupled with RavPower or Samsung Fast-Charge adapters charge at the same rate (10W to begin with tapering off to 7W above 50% charge).

craigdamey said:
There are only two types of charging dock, standard and fast-charge. None of them output 15W to the phone. The expensive Samsung is just a fancy fast-charge dock so it will charge at the same rate as the Seneo and others that support fast-charge. The Samsung fast-charge adapter only provides a maximum output power of 15W (9V @ 1.67A) so it would require 100% transfer efficiency to charge the phone at that power, and in reality it's only about 65% so at most you'll see 10W versus standard Qi charging at around 7W.
All of the Seneo chargers I have coupled with RavPower or Samsung Fast-Charge adapters charge at the same rate (10W to begin with tapering off to 7W above 50% charge).
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Ahh ok, I will have to check out a few seneo pads.

If your using fast charging AKA Adaptive charging it shouldn't matter either way. The Fast charging port on the phone, and the wireless charging should go through the phone and the phone should automatically stop all charging going to the battery. This is the reason why if you were to leave your fast charger on all night whether it be Wireless or wired, you can pick your phone up at 99% or 98% instead of 100%. The phone stopped charging, then when it drops to a certain % it starts to charge up again.
As far as which is actually best for strain, it shouldnt matter because afaik to the battery its the all the same. Wireless charging just has some coils almost that send the charge wirelessly, but it still goes to the same place.
This is what I have read from google, so I am no expert on the subject, but it seemed pretty legit, and makes sense to me, a person with a Tech background. If anyone knows better please be my guest.

I'm going with wireless charging pads at home but a magnetic cable for in the car.
Not found a good car holder that has the wireless pad built in so I will stick with my ibolt for a bit longer
Sent from my SM-G935F using Tapatalk

There is no correct answer to this question. Battery life is function of many things -
1. Every battery has specified charge cycle. One full charge from min to max is 1 cycle. Two full charge from mid to max is also 1 cycle. So the more you use your device, charge cycles will come to an end more quickly. For example if you use two similar spec phones; first one you use heavily requiring full cycle charge everyday vs second which you use less and requires full charge every alternate day (or to phrase in other way, first is almost completely discharged by evening, second is half discharged). So the theory goes that second phone battery will last double the time than first.
2. Every battery articles you read, you will find recommendation to charge battery in specified current or usually slow charging. Today's battery technology should be immune to this but I still turn fast charging off. It is likely that not all the batteries are immune.
3. Heat is bad for battery. Some wireless chargers heat up. The TYLT VU that I use get uncomfortably warm when I place phone vertically (possibly coils do not align and multiple of them gets activated). Heat build up is there during fast charging too. If you play CPU intensive games and charge at the same time, phone gets warm. All this heat is working negative to the life span of battery.
4. Lithium ion batteries have less chemical stress when they are not fully charged or fully discharged. If you research you will find articles telling one to keep battery between 40% to 90%. Hence I usually do not charge to 100% and if I do, I watch or play games to bring battery level down. Search for best charge level to store lithium ion batteries, I think it is from 45% to 50%. This I guess keeps batteries at the least chemical stress state. So do your maths if you are type who likes to keep battery at 100% charge at all the times.
As you can see there is no straight answer to this question. Battery life is function of all these factors.
Added: I didn't read full article but you can check this link which speaks about impact of heat and leaving battery to full charge state.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

Thanks for everyones input on this!
By the way, not sure if it has been mentioned, but this is a pretty cool read:
http://www.androidpolice.com/2017/0...ill-degrade-less-quickly-than-the-galaxy-s7s/
So looks like the S8 won't deteriorate as much over time!

I got the OEM samsung convertible fast charging pad but it doesn't come with a wall plug as I read somewhere (I guess thats just us in the UK getting screwed over yet again). The manual says "Use only Samsung-approved chargers that support fast charging (9v/1.67A, 9v/2A, 12v/2.1A).". So I need a wall plug that will be able to provide the fastest charging speeds from it (which I am guessing is one that does 12v/2.1A??). I dont think all the standard plugs with 2.4a sockets are going to do it right? The "30w" RAVpower one that craigdamey linked says it can do 12v/2A but only for QC3.0 (which I obviously wont get since its just being plugged straight into the charging pad), otherwise its 5v/2.4a. Not sure what one to get now. Theres an Anker 24w one but that says 2.4a per port (I know little about electrics and how these things work!).

How does charging a phone battery work?

1. For example, if a phone comes with a charger rated at 5V and 0.7A, when it's plugged in to charge, what dictates the current the phone draws, is it the resistance of the phone?
2. If I = V/R, do phones typically provide little resistance so that the current is the max the charger can provide? i.e in the above example, if the phone was off, would it constantly be drawing 0.7A, and if the charger was changed with one rated at 5V and 2A, would the phone draw more than 0.7A? could it reach 2A?
3...bit of a side question, but when the phone is done charging, how does it stop drawing current? again if I = V/R, does the phone have to alter the amount of resistance it is providing? how does it do that?
I'm only looking for fairly simple answers to be honest as this is just a general query and not something I need to go in depth with.
Thanks.

bubu1 said:
I'm only looking for fairly simple answers to be honest as this is just a general query and not something I need to go in depth with.
Thanks.
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Of course, I'm not in the secrets of the companies who build phones, but, as an electronician, I can answer general questions.
First, you have to know that the charger itself has no Idea of size of the battery he has to charge. It is just a regulated source of voltage, with a limitation to a maximum current. The charger limit the voltage at 5V, and, when you ask more amps than what he is supposed to send, It will reduce the Voltage, in order to limit the current to this max value.
It is the phone itself witch regulate the way it charge its battery. It follows complex curves, depending of the way it is programmed, fast charge etc... Of course, if the source limits the current, it will do its best with this max current. For the phone, a 5V unllimited current source is ideal. The fast charge consist to send the max current that the battery is able to afford at the begining of the charge (when empty) then limit progressivaly this current when the battery approach the end of the charge. This is for ION-Lithium batteries. Old Cadmium Nickel, by example, used the "delta peak" method. The battery was feed by a constant current (1A for an 1AH battery) and the voltage was monitored. This voltage increased with the charge, then after a maximum, began to decrease while the chage was at 90%. At this time, the current was reduced to 1/20 in order to never overcharge the battery.

No fast charging while using the N20U

Hello,
I am getting the super fast charging only while the screen is locked. If I am using the device while it's charging, charging is not so fast.
It says super fast charging but it doesn't charge so fast.
Is it just my device or others facing the same issue?

enjoylife1788 said:
Hello,
I am getting the super fast charging only while the screen is locked. If I am using the device while it's charging, charging is not so fast.
It says super fast charging but it doesn't charge so fast.
Is it just my device or others facing the same issue?
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This is turned off by default. View attachment 5105611
Sent from my BlackBerry Bold 9900

I have turned it on. But what I am talking is that it works when the phone is not in use.
Same charger while phone is in use the charging is slow.
Same charger while the phone is sleep mode, the charging is super fast.

This is normal to avoid over heating of battery while in use.

You can't have the screen on for fast charging, you can listen to music with bt though while fast charging.
Having the screen on disrupts the charge curve (it defaults to slow charging) and it's best practice not to do this.
•Start charge at 30-40% then let charge to 60-80%
To get a 20% charge in that range only takes about 10 minutes! Li's love to be used like this; short charge/use cycles do not degrade them like NiCads.
There is a known slight memory effect with Li's so periodically cycle them through a wider charge range.
•Never charge cell below freezing, best if cell temp is 80 F to 95 F. At 80 F or below plating can occur which would permanently degrade the cell.
Charging above 70% degrades the battery faster, above 90% the charging slows and the higher cell voltage degrades it even faster.
•Avoid charging to 100% except if you need to or to periodically do a full charge cycle.
Heat and high cell voltage are the killers of Li cells. By avoiding charging beyond 80% and high temperatures you can increase the battery lifespan by hundreds even thousands of full charge cycles.
A 20% is not a full charge cycle; 6%-100% is.
Five 20% charges would be roughly the equivalent of a full charge cycle in power but far less is cell degradation.
•Avoid discharging below 20%, 30% is better.
After 20% there's much less usable energy; the phone uses a constant 5 volts. The phone's voltage converters trade off milliamps for voltage and use more milliamps for converting lower cell voltage.
Volts x Amps = watts.
The phone's voltage and wattage requirements are constants. So at lower cell voltage the phone draws more milliamps to supply these; the battery provides less watt hours than at higher battery voltage levels.
So take a 10 minute break every 2 hours or so and let it fast charge during the break.

Samsung S10 only charges to 4.225 mV while turned on and upto 4.3 mV when turned off

i have a samsung galaxy s10 and somehow i notice that the charging speed is blazing fast from 89% to 100%. Then i monitor the peak voltage using AIDA64 and Accubattery. When my phone reached 100% it shows the voltage of 4.225 mV, i read that S10 supposed to charge upto 4.285 mV. After that i tried calibrating the battery by discharging it until my phone turned off by itself then charge to 100% while turned off and it shows 4.3 mV after i turned in on. What is happening to my phone and should i be worried about it?

In fact fast charging ramps down at about 80% then again around 90% in order to protect the battery. Excessive cold temperatures will cause fast charging not to engage.
You can't accurately measure Li charge level voltage or fast charge with the display on. If the display is on the power controller senses the excess power usage and ramps down fast charging. It will charge slowly at best.
To measure the voltage with Accubattery have the window open then turn off the display. When you turn it on you have about a second to see the voltage as it samples around every second or so.
It will immediately drop down then.
Depending on temperature, current draw and battery condition it may limit the top charge.
Fast charging to 100% stresses the battery needlessly as does constantly discharging below 20%. Li's prefer frequent midrange power cycling ie 40-72%. High cell voltage and temperature are their enemies. High discharge rates also can accelerate their degradation by driving up temperature.
Ideal minimum start charge temperature for fast charging is about 82F, minimum is 72F. If below about 55F fast charging will not engage for that charge cycle.
Cold charging Li's can cause Li plating which will permanently degrade the cell, a oid doing this!
NEVER attempt to charge an Li that is near freezing temperature

So thats the reason why my phone once dropped its percentage from 30% to 5% in an instant after having it in front of my car air conditioner. But is there a reason why my phone charged very fast from 89% to 100%?

It shouldn't drop that fast! Or charge faster near full charge. This is atypical performance.
You using the Samsung 25w brick and cable?
Erratic fast charging is a sign of a battery failure. Any swelling is a battery failure, replace asap.

Im using samsung 15w fast charging and btw i have replaced the battery around 5 months ago and i notice the fast charging speed only recently. Samsung didnt reset mt battery cycle when replacing the battery tho

Fixt1772 said:
Im using samsung 15w fast charging and btw i have replaced the battery around 5 months ago and i notice the fast charging speed only recently. Samsung didnt reset mt battery cycle when replacing the battery tho
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You need the 25 watt Samsung brick and cable.
15 watts will slow fast charging down if it works at all. If fast charging it should add about 2%@minute for 4100mAh battery in the 20-70% charging range.