yashsingh1/xdaforums huggingface dataset:
[Galaxy S 4 General] R-P:
Did some quick tests with the phone 60% charged and my measuring cable between the charger and the charging cable.

The voltage of the supply was 5.06V, measured before the resistor with no load (=phone not attached)

Using the original cable: it rose to 5.26V when attaching the phone (screen automatically turns ON) and the current is (105mV=) 1.05A

When manually switching the screen OFF, it rose to 5.35V and (166mV=) 1.66A

The charging app showed 1200mA (haven't figured out how to let it show the screen-off-charging-current yet)

Then I replaced the original cable with one I know to be faulty (only very slowly charges my phone).

Voltage with phone attached was 5.16V and current (26.4mV=) 264mA

Charging app showed 300mA

So yes, apparently the charger DOES increase the output voltage when more current is drawn, probably to compensate for cable losses.

Roughly:

5.06 with no draw.

5.16 with 264mA

5.26 with 1.05A

5.35 with 1.66A
[Galaxy S 4 General] yznhmr:
is it possible to trigger/use high speed charging while using the data lines on the usb cable?
[Galaxy S 4 General] yznhmr:
I have a Sony Radio that does Mirrorlink, but the usb connections out of the radio, dont allow HS charging,, it actually discharges faster then the it will charge,.. anyone familiar with this?
[Galaxy S 4 General] ace_nitros:
Galaxy charging correct readings

i heard for the galaxy s4 the correct reading to get from the galaxy charging app is (1200) which you only get when using a 5v , 2 amp charger
[Galaxy S 4 General] drutort:
get a PortaPow USB Power Monitor / Multimeter / DC Ammeter

I just got a few weeks a used S4, and I thought I had a decent charger for overnight.

So what I did was go on a hunt for a way to test my cables and chargers.

What I found out is that this:

"PortaPow USB Power Monitor / Multimeter / DC Ammeter"

http://www.amazon.com/gp/product/B00DF2485S/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1

That gives you the voltage and amperage reading. Now there are cheaper ones but I read the reviews that they would not function over time, so I bought this one that has a switch for V and A

I do not have OEM S4 usb cable nor charger, I have a dual port 2.1A ebay charger that I thought was good to 2.1A or at least 1A per port, with the above tool I measured only 0.8A draw per port with OEM S3 cable

I bought also what is to be believed OEM S3 cables since they are 5 feet!

http://www.amazon.com/gp/product/B00DVBB0XQ/ref=oh_details_o00_s01_i00?ie=UTF8&psc=1

they look almost 95% OEM, everything is there, but you can see the usb logo is just slightly different size, and the over all length was about 3/4" different. Now for the test!

So I went to the nexus 7 2013 charger rated at higher voltage and 1.3A (I believe)

I expected that amazon "OEM" cable to be same but it varied lower by 0.1A so to me its not 100% OEM even though it looks and feels OEM!

Still the Battery monitor widget showed greater then 1A charge over night... so go figure the app is not good at testing IMO

It is possible that quality of charger and its ability to communicate with the device? makes a difference be it shielding or proper resisters on the other cables?

I am looking for proper multi port USB chargers, but the few ones that are had QA quality with ports going down, such as this one:

http://www.amazon.com/Family-Sized-...d=1404539947&sr=1-2&keywords=usb+wall+charger

I am also not 100% if there is proper shielding on the PortaPow USB monitor, but it seems to be working good, and others have vouched for it. I think a Kill-a-watt tester would work but you would have losses to account for, that is you will read higher values of A usage because of the chargers inefficiencies (consumption itself)
[Galaxy S 4 General] fastguy:
Resistance or Not

I'm reading many pages and many posts. I've seen in some other Tab threads that Samsung puts 33K and 10K resistors. Here in this thread, I've read 82K resistors, and some other posts that actually no resistor is needed, only shorting them works.

Which one is correct information, does anybody know?
[Galaxy S 4 General] rgshah3:
I'm getting 1200 mAh on my OEM charger! Is it good?
[Galaxy S 4 General] ThisTechGuy:
I think so :good:
[Galaxy S 4 General] ss.suryakant95:
:thumbup:Got rid of many queries
[Galaxy S 4 General] 012512:
Thanks that I found this thread. I will add some too for reference because I forgot my charger, together with the cable, from my girl's house so I did find an alternate charger, and a

cable, for my phone.

I tested with different chargers and cables.

First I used a generic (not sure if) sony usb cable (same build with original samsung cable) together with its sony charger 700mAh. I checked it was gathering only 420mAh which is too slow to charge up my phone while using and too long to charge when idle. It may cause a discharge too.

Second test was the same cable with Iphone charger 1A. The result was a little bit frustrating as it only giving a 540mAh output.

Third was the same cable but a test with a generic Samsung tab charger 2A. It only shows 860mAh. Good enough to charge the phone but it will still take time to charge the phone fully unlike the original cable and charger though.

The fourth test was the same cable but with an LG charger 700mAh. The result was close to the output of the charger which is 620mAh.

The fifth test was using an original samsung cable (came with an old Samsung Pro). So since the cable was from a samsung phone, I was expecting too a difference from the other brands. I tested it with the given chargers respectively

Iphone charge 1A = 1200mAh

Generic Samsung tab charger 2A = 890mAh

Lg charger 700mAh = 680mAh

So my conclusion is that the first post was right. Still it depends from the charger and the cable itself. Now I understand why these manufacturers critically suggest the accessories that came from the unit.

Will be posting the chargers and the cables later.

(Using iphone charger 1A + samsung Pro cable)
[Galaxy S 4 General] editable:
When screen on = 1200mA

When screen off = 1900mA
[Galaxy S 4 General] 012512:
Oh. Now I understand.
[Galaxy S 4 General] galliard:
Increase usb charge current

Hi all,

I want to increase usb charge current for my SHV-E330L equivalent to AC, I know it can be done with custom kernel by forcing charge values but unfortunately couldn't find any custom kernel for this model so please help me to this with stock kernel.

Regards
[Galaxy S 4 General] Jack DurDen Kelevra:
please help

sir im using galaxy s5. when i charge the s5, the voltage meter is marked to 4.335 when reaching 80% level. which is i think this is not right. too much voltage of the battery while charging will fry the battery right?. can somebody explain this to me? sorry for my bad English :D
[Galaxy S 4 General] Rob2222:
This is perfectly OK. Since the Galaxy S4 Samsungs uses a new 4.35V (instead of 4.20V) upper limit lithium-ion technology.

BR

Rob
[Galaxy S 4 General] deepaksupercool20:
Which app to know charging current on my i9500?
[Galaxy S 4 General] Lasik25:
Try "Batery Monitor"
[Galaxy S 4 General] Grexy:
Voouvv great finding. My cable is broke. I need a new cable. I should buy a orginal cable or cheaper cable. Do you think which one?
[Galaxy S 4 General] jimmy2x2x:
Great thread, very different charging times had me confused. Thanks to all contributors
[Galaxy S 4 General] NoobKnight:
I bought on Amazon a Battery pack to charge my phone and other devices when on the run. I comes with three ports 1.5A x 2 y 2.2A x 1 and whenever i tried to use my S4 cable to charge using the 2.4amp port it wouldn't charge. I assumed as well that it was due to the limitations of charge of the phone until one day I used the USB cable that the pack brought to charge it and when i used It with the phone it worked!!! and boy it worked.

I was able to charge my phone by 50% in less than 15 minutes which is pretty amazing. After some digging and checking i realize the problem is that my battery pack cable has no data pins and therefore it only passes energy, making the charge blazing fast.

What you guys think>?
[Galaxy S 4 General] Grexy:
Interesting experience. I will test this method [emoji15]
[Galaxy S 4 General] J1897:
I charge my phone with different chargers, I have an iPad charger (of course not the cable), a Nexus 7 (2013) charger and the original charger, anyhow the fastest seems to be the original one which charges in about 2 hours, the other two charge the phone in about 2,5 h.

I cannot say if it is the cable issue or the charger.

Anyhow all cables should be good types because all came along with devices (Nexus for example). I have never purchased any extra cable.

Good to know that quality cable is worth the money, specially if there some available without data pins.

But I have a question, if the battery charges too fast (i.e. with cable without data pins) is that still OK for the battery? Or it decreases its durability?

J.
[Galaxy S 4 General] Dngrsone:
I find that cables without data pins will actually charge slower. The Galaxy line looks for two things on the data lines-- continuity between the two pins tells it that it is not connected to a computer (which would call for slow charging at >= .5a), and a specific voltage differential between the data pins and the positive pin. If the differential is there (a voltage drop of apprximately 3.73v from the positive pin, which would be about 1.25v above the negative pin), then the device will charge at around 1.1a.

I have yet to experiment with the resuts found in this thread, namely increasing the input voltage to the device, to see if I can get a faster charge that way.

There is an article out right now that suggests that fast-charging my not be as bad for lithium-ion batteries as has been conventionally thought. Samsung certainly has no problems with fast-charging at 2a for their devices, and at least for the cell-phones, you can easily replce them, unlike the tablets, where I will have to do some serious surgery to replace the batteries on my Galaxy Tabs.
[Galaxy S 4 General] Rob2222:
Hello,

For 1900mA you need two things:

A) Have a sufficient charger (2+Ampere) and let the phone know, that it is connected to a high current charging source. I think it is done via connecting D+ and D- on the galaxy models, but I am not 100% sure here.

and even more important:

B) Deliver enough voltage to the Galaxy mainboard. This can be a problem, cause with a high current like 1900mA and the small diameter cables and small connectors you loose some voltage in the cable on the connectors.

So if the charger sends 5V to the line, on the mainboard you get LESS than 5V on 1900mA. So the Phone maybe does not charge with 1900mA, cause the voltage on the mainboard is to low.

Cause of that the S4 charger is intelligent. If a phone draws 1900mA from the charger, the charger raises its output voltage from 5,0V up to 5,3V to compensate the voltage loss in the cable.

So if you have a non-intelligent 5V charger that can deliver (for example) 5A but always stays at 5,0V it can be, that the S4 still can not charge with 1900mA.

You need a good cable, correct charger identification and a good / matching charger.

BR

Rob
[Galaxy S 4 General] Billw129:
I don't know if it has already been discussed in this thread I got lazy and stopped reading but the Apple 2. 3 amp 5.3 volt wall charger with a very short USB cable with data lines shielded does charge the s4 at nineteen hundred MA.
[Galaxy S 4 General] ldmelo:
Did anyone manage to get 1900mA from a car charger?

I never got more than 1amp...

I have this charger: SKU 179764 http://www.dx.com/p/i-mill-dual-usb...ipad-2-android-more-white-179764#.VDfhkvldW9E

After reading this thread, I decided to investigate, and got the following measures (resistance measured from pin to pin):

Neg | 32k | Data+ | 29k | Pos

Neg | 29k | Data- | 32k | Pos

Data- | 48k | Data+

Outer part of the connector not grounded or connected to anything at all.

So I disassembled the car charger and soldered D+ to D-. Also, managed to solder the outer part of the connector to the negative.

Reassembled everything and tested (power source -> car charger -> samsung cable -> phone). Got 840 - 960mA.

.... so, after all the work, current seems higher (before was about 460-700mA) but still no 1900...

Btw, I need to say that this s4 is really intriguing. I decided to run some other tests and got a protoboard and a disassembled USB extension (the plan was to test different scenarios, d+ and d- shorted or not, etc). However I couldn't even start the tests because every time I had the protoboard set up, the phone seemed to detect it somehow and the current was set to a very low level (340mA) , even when using the original wall charger. Check this comparison:

1. Original wall charger -> samsung USB cable ==> 1200mA and more

2. Original wall charger -> disassembled cable male -> protoboard (no changes, bypass only, incl shield) -> disassembled cable female -> samsung USB cable ==> 340mA (?!?!?!)
[Galaxy S 4 General] ldmelo:
I need to say that I just got some other charger I had ordered from DX. Data pins are not shorted but I can now get 1900ma using a generic shielded cable.

Charger is this: SKU: 58012

http://www.dx.com/p/car-cigarette-powered-dual-usb-adapter-charger-black-2a-max-dc12v-58012

This charger has two USB ports, (A and B). My measurements:

USB PORT A

Neg | 23k | Data+ | 23k | Pos

Neg | 30k | Data- | 30k | Pos

Data- | 53k | Data+

Shield | 0k | neg (Outer part of the female connector shorted to the negative)

USB PORT B

Neg | 8k | Data+ | 9k | Pos

Neg | 8k | Data- | 9k | Pos

Data- | 0k | Data+

shield | 0k | neg

Shield | 0k | neg (Outer part of the female connector shorted to the negative)

I can get 1900MA using USB port A.
[Galaxy S 4 General] Woodski:
I had 600mA in my car

After making the cable shorter it's 1900mA now
[Galaxy S 4 General] scloutkst:
Length has nothing to do with the charging rate. It has to do with quality of the cable. I have a nice 15 ' cable from Monoprice.com that charged my phone at the full 1900 mA
[Galaxy S 4 General] :
Useful thread. Thanks
[Galaxy S 4 General] amlopez:
I used gsam battery monitor to check the charging current. I find that it is different from time to time. During the charging process, sometimes it's 1200 mah and other times it's 1750mah or 1900mah.
[Galaxy S 4 General] knuckles1978:
I'm using a 1st gen Nexus 7 charger. When I first plug it into my phone it will start charging at 1A, but within 5 minutes or so it jumps up to 1900mA, and stays like that until the phone is at about 95%, then it backs off a little to 1500mA for the rest of the charge.

Charges my S4 in record time. 1.5 hours.

An app called charging report from the play store is really good for monitoring, or finding out what your best charger/cable combination is.

Edit: forgot to mention, I'm using lollipop and Alucard kernel. With alucard kernel you can use the stweaks app. Stweaks lets you force fast charge, and even select the charging current. I've just got it set to Max. I don't know if these settings are doing anything or not, I've not messed with them because my phone charges super fast at 1.9A, but for anyone whose phone isn't charging at that current, I'd recommend giving alucard kernel a try.

But make sure you're using a charger rated for 2A, and a nice short, fat (shielded) cable. Also, don't buy cheap chargers. I saw an article where chargers were properly tested, and the cheap ones performed much worse than genuine Samsung or high quality ones. Not to mention that they're much more likely to fail, or set your house on fire. :D
[Galaxy S 4 General] Conito11:
Really i didn't understand so much but there is something that i discovered. If i use a galaxy grand charger it takes so much time, but if i use s4 ones it take just 3 or 4 hours. If you charge your phone on air plane mode and with saving energy mode your phone will be charged in 2 or 3 hours :beer::banghead::cool:

If I'm not wrong, you can change the amp and voltage and stuff with some kernels. Also if you use a bigger charger and stuff or mod it you will get a faster charge but your battery phone will pay the price. It could make BOOM! :eek:
[Galaxy S 4 General] TheLegend90:
Has anybody successfully purchased a USB cable online and got 2A? I'm not even getting 1000 mA with my stock charger
[Galaxy S 4 General] Dngrsone:
I think you'll only draw 2a when your battery is really low, like below 50%, but I haven't had any time to experiment lately. When you are topping off, it looks like the device pulls only around .96a or so.

I have plenty of Samsung cords at the moment, so I haven't gone shopping for a high-quality thrid-party cord yet.
[Galaxy S 4 General] kindred3:
Could you please post the part number/ Link for this cable? I am interested in purchasing one.
[Galaxy S 4 General] Smartie36:
My own experiences says otherwise, I've only ever had my s4 charging at full speed when screen is off while using short 1m length cables and they were high quality shielded cables too.
[Galaxy S 4 General] munichsfinest:
Anybody here who uses qi wireless charging? Just got it, it works just fine, but I'm a bit confused: It shows it's being charged even when I take it off the pad and move to another room. Only managed to get it back to normal by switching off the phone completely and pulling the battery :confused:
[Galaxy S 4 General] hotshotbg:
Has anyone tried this Nokia charger?

Nokia Universal Fast USB Charger AC-60 (can't post external link)

I blew up my original adapter by charging an external Lenovo battery pack or it might have been defective because the battery accepts 1.8A input and the default charger is 2A but the charger stopped working and made a popping sound.

Anyway, will I be able to charge quickly with this Nokia adapter even on 1.5A?

I think Nokia cables are of high quality and the price is really good??

Don't want to experiment with cheap chargers or buy expensive ones, so this Nokia cable seems fine?

Edit: It is a fast charger. Apps indicate 1800-1900mA and it matches the original charging times of OEM charger.
[Galaxy S 4 General] Zookrider:
ah HA

Ok, I've been messing round with a whole box of USB Car chargers and cables etc. :D

I have carefully pulled the red + wire out from the sheath of a cable that seems pretty nice and got a current clamp around it. (No shielding BTW)

I've got some USB units where I've been able to draw over 7A from it.

So my SGS4 has only been drawing max 1200mA with a properly configured Samsung port, as per the intro of this thread. It got me stumped why the charge current is so low.

Then I figured out ONLY when you turn off the screen does the charging current rise to 1900mA. Why would this be? seems strange to draw less when there is more load.:confused:

BTW, I also tested this again using the standard charge USB and the apple standard configs. Same result, 1900mA off both the app and the clamp meter.

So for my case, it didn't matter the charge standard or no shielding, and I get 1900mA. :p
[Galaxy S 4 General] myshu:
Probably because charging at 1900 mA heats up the phone when you start low (10%). So heavy usage = hot + charging hot = meltdown ? :)
[Galaxy S 4 General] sama121:
please confirm me samsung s4 charger amp? 2 amp or 1.5? which one amp is suitable for me? i am little bit confused so please take a kind look into my problem and help me.
[Galaxy S 4 General] Zookrider:
Hmmm, interesting, updated to 5.1 ROM, and she sits on 1900mA with screen on or off, its also notable how fast it charges while while in use.
[Galaxy S 4 General] R-P:
I had 500mA in the car and now 1.5+A. But with the same cable ;)

Opened up the charger, googled the chip, worked out some resistorvalues to increase output from 5.0 to 5.4V and voila.

My other car has a DIY build in charger based on 7805 voltage regulators. Too bad I didn't know back then what I know now: they give 4.9x Volt output and only trickle charge my S4 with 300mA or so :( (I have HRD05003's (switching 5V 3A adjustable power supplies) lying ready to replace them).
[Galaxy S 4 General] transputer:
Hi

Just moved to s4 from s3 and finding it's a similar beast re chargers & cables. To summarise I have found the following to be the best combo...

1...Samsung white chargers with 2A on the label (2 amp )

2...Lindy Professional 'Chromo Gold' USB cables (thicker supply wires to handle higher currents). Yes they are expensive for a reason !.

3...'Ampere' app for measuring charging current.

This combo gave a marked improvement with my s3. With the s4 I have already seen charging currents of 1200ma (1.2 amp) & expect higher when the battery is flat. Yes charging current is also related to the level of charge in your battery so you will probably see lower currents as the battery approaches full charge.

Regards
[Galaxy S 4 General] cricriadi:
Could you tell me how to shield my cables to? Im 15 but very good în electronics and home electricity, i dont get the part with the 82 k rezistance and i was also curious If some home tin foil would work
[Galaxy S 4 General] Dngrsone:
What do you expect to do, actually? In the post you are referring to, the person was making a cable that would fool the phone into thinking that it is attached to a high-current charger. It will only do that if the power source the cable is plugged into can actually provide that higher current.

I built something similar so that I could charge my device from a bench power supply using a recycled USB port and a 10k potentiometer.
[Galaxy S 4 General] cricriadi:
+Dngrsone well în the house all the adapters work and only 1 usb cable is doing its job, so i thought that maybe is posibile to make from a bad usb a good one, and btw tell me how to quote people
[Galaxy S 4 General] Dngrsone:
[ Quote=username ]text[ /quote ] without the spaces between brackets and word quote. This is standard bulletin board (BB) code.

Your problem, then, is that you have crappy cables. Or more properly, you have charging cables and not data cables. The difference being that the data cables have two data wires in addition to the two power wires going between the two connectors. The phone senses a specific voltage on these two data wires that tell it that it is attached to a higher-current charger to allow it to charge quickly (or it senses that it is attached to a computing device for data transfer).

The charging cables either lack these data lines completely, or they are damaged, and so the phone assumes it is attached to a low-current charger and therefore charges much more slowly (if at all... sometimes the phone uses the battery faster than the charge can accumulate).
[Galaxy S 4 General] cricriadi:
makes sense, so i cnt make my self any cables cant i?
[Galaxy S 4 General] Dngrsone:
Sure; if you got the wire and connectors... As you mentioned earlier, shielding might be an issue if you wanted to push data over it, but if you just want to charge, then it shouldn't be an issue.
[Galaxy S 4 General] DJ_Uro_UE:
Hello.

On my brother's i9505 we have seen that phone quickly discharges battery. New battery can't hold up to 24 hours. I have installed Ampere app, and when phone is idle, it shows -460mA value. Is that standard value for S4 or something is wrong with hardware?

Software is latest lollipop stock. Thanks in advance.
[Galaxy S 4 General] patriot16:
hey guys i wonder if this really work. anybody try it yet

https://www.youtube.com/watch?v=RHlR3p3YkLg
[Galaxy S 4 General] Dngrsone:
Be nice if he actually said why this would supposedly work...
[Galaxy S 4 General] terry1738:
Thanks so much for this post. I have an S4 that I run in the car and its been discharging running my navigation app and a ODB2 app via bluetooth yet on a wall charger I can run both these apps and the S4 charges. I brought a 5amp 5v DC:DC charger but it made no difference now I understand why. Will try the 2 x 82K resistor trick and see if that solves my problem.

Thanks again Terry