yashsingh1/xdaforums huggingface dataset:
[Galaxy S 4 General] rahlquist:
I have one of the aforementioned 24/28 cables as well as http://www.amazon.com/gp/product/B00AVXA2SQ/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1 which has a "Samsung Tablet" port (betting the data ping are shorted together). I havent done an overnight charge on it yet but will tonight and will post my logs from Battery Monitor Widget which should give a bit of empirical data.

I wish samsung would include the bloody kernel driver for the charging monitoring that all of their android phones have been capable of since the first gen Galaxy.
[Galaxy S 4 General] Brendo:
I've done some tests myself (not as specific as yours) and also come to the conclusion that cheap cables just aren't good enough :( Pity cuz I need a longer cable to use at work
[Galaxy S 4 General] deathnotice01:
wierd because my phone while plugged into the computer's USB cord is getting discharged when used heavily
[Galaxy S 4 General] coolraghav:
Just to let you guys know, I use this charger @ my office to charge my blackberries and s4 and it totally works fine..

http://www.flipkart.com/samsung-cha..._3&otracker=from-search&query=samsung charger costs $5 original samsung charger

Although charging through http://www.flipkart.com/burgundy-power-pack/p/itmdcg5vfgrcfysz this Burgundy Power Pack 6000 mah is pretty pretty slow. My phone goes maybe 1 percent up or remain same if I'm using it simultaneously .. :S
[Galaxy S 4 General] follo:
ATADU10IBECINU output is 700ma vs 2000ma of the original S4 charger.

I think this can't give you a fast charge.
[Galaxy S 4 General] rahlquist:
Ok here are the results of the overnight charge on;

http://www.amazon.com/gp/product/B00AVXA2SQ/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

and

http://www.monoprice.com/products/p...=10303&cs_id=1030307&p_id=5458&seq=1&format=2

With this night and other testing, this charging setup is only slightly slower than the OEM charger/cable that came with the device. To me this is a viable alternative to stock. I understand the current measurements in the ma column are just calculated estimates but they are still probably fairly close (+/- 100ma) would be my bet.

Edit: Fair warning though, the ends on the monoprice cables like most cables out there not from Samsung required trimming of the plastic to work with my case.
[Galaxy S 4 General] Entropy512:
Yeah. They seem to never include the interface (or break it severely) in every device they have (except tablets, current monitoring does seem to work on most tablets.)

Also, on some of their devices (N7000), the current monitoring hardware pegs before it reaches maximum limit! I always thought the N7000 had some sort of weird 750 mA charging limit, but it turns out it's just the monitoring interface - it pulls 900-1000 mA according to my bench supply. (Should pull 1000.)
[Galaxy S 4 General] spark001uk:
Plot thickens !

Interesting. I also have a Griffin Powerjolt dual USB car charger, which claims to be 2 x 1A outputs, so I thought I'd have a look inside it. Turns out the two sockets' data pins are voltage programmed differently, despite both being described as 1A outputs!

Schematic of how they're wired is attached.
[Galaxy S 4 General] rahlquist:
And have you compared them to see which charges faster on a Samsung? If the findings of the fast charge folks are right ( http://xdaforums.com/showthread.php?t=1384253 ) output 2 should charge your phone faster.
[Galaxy S 4 General] ThugosaurusRex:
Very informative, thanks for taking the time to post this :D
[Galaxy S 4 General] spark001uk:
Well I knocked up a short breakout usb cable (pictured) to check out what's going on, and I used my DC clamp meter so as not to physically interfere with the current flow. Turns out both ports on that griffin car charger allow the s4 to draw full current (1.9A), I can only guess that the different resistor configurations are just there to maximise compatibility with different devices. The griffin charger's maximum draw is stated as 10W @ 5V (which is 2A), so if you charge the phone at 2A from one port then that's your full 10W, so you wouldn't want to use the other port at the same time.

As for mains charging at full rate, my obvious suggestion would be to buy something like an iPad charger - they're easy to get hold of, and the configuration inside them allows for at least 2A (2.4A if I recall). Use it in conjunction with a GOOD QUALITY micro usb cable, ensuring it's man enough for the job and that it has a continuous shield from end to end (the metal outer screens of the connectors).

Regarding the generic mains charger mod in that other thread, I wouldn't recommend re-hashing just any old mains charger, as there is a danger of the phone asking for more current than the charger can supply, and then it'll just overheat and probably fail. So exercise caution there, you're better off just buying a capable charger as I said above.
[Galaxy S 4 General] Hypochondria:
That was the batter monitor widget correct? What settings did you enter into calibration? I tried using it but so far has refused to give me a amp reading
[Galaxy S 4 General] rahlquist:
All I believe I entered is the 2600 for battery capacity
[Galaxy S 4 General] Hypochondria:
Thanks, you sure you didn't enter anything for charger output power? IT asks for something when you enter calibration for the first time
[Galaxy S 4 General] rahlquist:
Mine reads -1

I have fast charge checked.
[Galaxy S 4 General] Entropy512:
Did your breakout cable short D+ and D- internally to the cable?

Because iPad power supplies are usually NOT detected by Android devices as proper AC power supplies - usually they are detected as USB ports, although some newer Qualcomm-based devices can semi-detect Apple supplies (they're called simply "proprietary charger" in kernel sources), and usually go to 500 mA or 1A in this case - I've never seen a device charge at more than 1A from an Apple supply unless it was modified (D+ and D- shorted together by the power supply or cable.)
[Galaxy S 4 General] Entropy512:
Output 1 in your diagram is clearly an iPad charger resistor setup.

Output 2 looks like it MIGHT be Samsung tablet-capable (I forget if it's 1.2v or 1.8v that Sammy tabs expect...) - at a minimum it'll be properly detected by standard devices as a standard supply. OK just checked - according to http://xdaforums.com/showthread.php?t=845844 it's around 1.15 volts. So output 2 is definitely Sammy tablet compatible and also standard-device compatible. (Samsung's tab supplies are compatible with standard devices, but not the other way around.)

So they're probably both 1A outputs - just one is for iDevices, the other for Android devices including Samsung tabs.
[Galaxy S 4 General] DOVahFeyN:
I wonder if the ETA-U90JWS charger version Samsung ships out would be the same?
[Galaxy S 4 General] Hypochondria:
Thanks, How long did it take for the MA to show up? I's been more then 24hrs and I had a charge cycle from 5%-100%, but it still fails to show the MA :(
[Galaxy S 4 General] azdine57:
Charge Time:

22h49 => 1%

00h55 => 100% (full)

2h06 with Stock charger (2A) for me...

Envoyé depuis mon GT-I9500 avec Tapatalk
[Galaxy S 4 General] rahlquist:
Showed up within minutes on my M919 Variant, are you on stock rom?
[Galaxy S 4 General] Hypochondria:
Yup. Finally did get it working. I had to change the display settings. Took several attempts before it showed up
[Galaxy S 4 General] azdine57:
Thank you Amazon :cool:

Envoyé depuis mon GT-I9500 avec Tapatalk
[Galaxy S 4 General] spark001uk:
The breakout cable I made has four series jumper links, so i can interrupt any lines for test purposes. I can also short data lines if I want to. I brought a supply wire out on a loop just so I could get a clamp reading. I did do some shorting/divider setups as well, but it only told me what I already know really.

As for the Ipad charger sensing, I have an ipad4 charger here, and I can confirm that with a decent usb cable the S4 sees it as 2A capable and successfully charges at full current. The same as it does on either of those two ports on the griffin car charger.

Yes that's a lovely picture of a battery, not sure about its relevance though! :confused:
[Galaxy S 4 General] Entropy512:
That's interesting. Detecting both standard and iDevice chargers as AC chargers is nice. :)
[Galaxy S 4 General] spark001uk:
Well yes, considering ipad chargers are easy to come across. Or indeed other chargers with the right resistor setup. Nor forgetting that equally important to the S4 is the shield being connected to ground at the charger end (most AC chargers nowadays seem to be).

I'm tempted to get one of these as a spare : http://www.ebay.co.uk/itm/271195213246

Or this one: http://www.ebay.co.uk/itm/390587282054

Personal opinion thinks the latter looks a bit more well made (though it's probably 2A max, not per port). Might be worth a punt. Can always rearrange the config of the port if it's not right.

Another point to note is that if you search for "galaxy s4 wall charger" on ebay, most of the ones on there are 700mA or 1A. Enough to charge it, but you'll be waiting a long time!
[Galaxy S 4 General] Whatever_Guy:
Thanks for the info in this thread, I was wondering why my S2 charger seemed to be giving a slower charge.

I was about to get an in car charger too, guess I'll need to look more specifically for a 2A one, similar the tablet car chargers etc.

Ta!
[Galaxy S 4 General] spark001uk:
If you're getting a car charger, don't be tempted to get one of those cheap ones with the nice looking metal face on them, i did that. I took one apart and ran it, and you could light a cigarette off the charging chip! Get a Griffin powerjolt, or similar, works great. Make sure it's rated at least 10W total (equates to 2A @ 5V). The Griffin I have has 2 sockets but its still 10W total, so when i charge the s4 on it i dont use the other socket at the same time.
[Galaxy S 4 General] hybrid3k:
If you take a look in to the source code, you can see the phone is limiting this with a USB / Charger detection.

If no Samsung Charger is detected (via the resistors) the phone needs to be compliant to USB spec and therefore is only allowed to Charge with 450mAmps.
[Galaxy S 4 General] Whatever_Guy:
Cool thanks for that spark001uk, I'll check out the Griffin :D
[Galaxy S 4 General] shopkins82:
Who is the developer for the "Battery Monitor Widget" you are using? There are several in the play store under that name... I'd like to test a handful of different chargers and cables I have on hand in different combinations.

I will say un-scientifically that the cheapo retractable cables connected to laptop USB do drain instead of charge (so likely in the .3a or less range), while stock Blackberry cable charges off of laptop USB, and an old Zune 1.5a charger w/ the Blackberry cable seems to charge fairly quickly.

I'm also curious as to what kind of draw you would get from one of these iPad PC USB charging adapters (which overrides the USB port 500ma limit to draw the full current available from the board/power-supply)... my main motivation is that I charge frequently from my laptop while traveling for work to keep down the number of chargers & cables I need to carry.
[Galaxy S 4 General] whatsisnametake2:
my findings

just to add my findings to this thread. i have a cheap no-brand 2A mains USB charger and have been trying out various combinations.

original samsung charger and lead gives me 1900mA (using galaxy charge app).

original samsung charger and 1m no-name lead - also 1900mA.

cheapo 2A charger and samsung lead - 1900mA.

chaepo 2A charger and 1m no-name lead (as above) - 1360mA.

curious findings in some ways. as soon as i started using longer leads tho the charging current started to drop away, so to me it seems predominantly dependant on length of the cable, and a little bit the charger. getting some 1.5m and 1.8m cables tomorrow to see how long a lead i can use with the oem charger and still get full 1900mA.
[Galaxy S 4 General] shopkins82:
Are you using "Galaxy Charging Current", either Lite or Pro? I get some odd results from it, but maybe they are normal:

NO charger/cable attached - 460

Blackberry Cable + HP Laptop USB - 500

Blackberry Cable + HP Laptop Dock USB - 900

Blackberry Cable + Blackberry 750ma Mains Charger - 900

Blackberry Cable + Zune 1.5a Mains Charger - 1900

Would the above be skewed in some way, possibly by the fact that I currently have 100% charge on the battery? Just testing a bit as these are the chargers/cable I have at my desk at work. I also seem to get the same results with a cheapo retractable (VERY tiny gauge cable) as the Blackberry cable, including a reading of 1900 from the retractable cable + Zune 1.5a Mains charger.

Thoughts?
[Galaxy S 4 General] twistedm04:
This is really informative! So it looks as though the phone will pull the amount of mA it needs/wants as it's charging. Does this mean that it's ok to use a 1amp charger from my galaxy nexus with the S4 and not cause damage? Essentially it's same concept of being plugged into your computer with a good usb cable right? Granted it would charge slower.

I ask because I own an abundant amount of those chargers and wouldn't mind using them as backup chargers.
[Galaxy S 4 General] shopkins82:
Best I can tell, as long as you're showing above 460ma draw in "Galaxy Charging Current", you should be charging... how much current you draw from 460ma up to 1900ma will determine how fast you're charging.

I use a range of different chargers... the aforementioned 1.5a rated Zune charger gives anywhere form 1090ma to 1900ma when using a decent cable. A Blackberry 750 ma rated charger gives anywhere from 360ma (discharging) up to 900ma depending on the cable. The strange part is that the same cable that consistently gives 360ma on the BB charger also consistently gives 1900ma on the Zune charger and Samsung charger.

I've not disassembled any of the chargers to map the circuitry (I'll leave that to people who care more than I do), but I've found enough charger/cable combinations that work well for me that I won't be replacing much of what I have on hand from previous devices (beyond picking up a 3.1a dual-usb car charger for charging my S4 and my wife's iPhone 4 at the same time).
[Galaxy S 4 General] hybrid3k:
As said before, its detected by the mobile, depending on the resistors. These are in the charger.

it may be possible that different chargers have some Kind of resistors in them, which let the Samsung also detect "charger mode".

Again, you can use whatever USB cable on the original Samsung charger and it will Charge at full power.

if another type of charger has also the resistors between usb data and vcc and gnd, it will also work with whatever cable.The mobile Needs to detect if its connected to usb (Limit to <500mAmps) or a charger.

All effects which happen above 1000 mAmps charging are due to several reasons (Quality of charger etc).
[Galaxy S 4 General] stuartv:
Just FYI, I have one of these:

http://www.amazon.com/gp/product/B005ZXIQYY/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A2QHBM8MEN9W65

Using that (in the 2X port) and the stock cable, GCC shows 1900.

Using that (in the 2X port) and an old Blackberry data cable also shows 1900.
[Galaxy S 4 General] JAMIE1000UK:
I'm often use a usb extension cable aswell as the original cable. Original cable gives 1900ma attached to extension it gives 1300ma..
[Galaxy S 4 General] Xphome:
Odd

I've noticed that the last 3 charges have taken more than 4 hours. When I started charging it today I noticed that it said "Charging (USB)" in Settings > Battery, I unplugged it and plugged it back in but still the same. I fixed it by connecting it to my comptuer, unplug it, plug it back in to the charger.
[Galaxy S 4 General] mikew99:
I just happened upon this thread after doing some similar experimentation, and my results seem to mirror those here. What caused me to do this is that I went on my first trip with the S4, and I discovered that the charging solution I have used for years (consisting of a generic travel charger and a retractable micro USB cable) failed to charge the S4. In the past, had no problem using this combo with my Motorola Atrix or my BB.

When I returned home, I gathered together all the various USB chargers I could find and started to test them with the stock S4 cable and my retractable USB cable. Here are my findings (as reported by the Galaxy Charging Current app):

Charger, Stated Rating (mA), Charge w/stock S4 cable, Charge w/Retrac retractable cable

Samsung gs4 charger, 2000, 1900, 380

Samsung gt2 charger, 2000, 1900, 300

Generic dual charger, 2100, 1900 (bottom) 1900 (top), n/a

Motorola Atrix charger, 850, 860, n/a

Fidelity dual charger, 500-1000, 1900 (side) 460 (bottom), n/a

Jet black charger, 1000, 460, n/a

Jet white charger, 1000, 300, n/a

phihong black charger, 1000, 1900, 340

elago dual charger, 500-1000, 1900 (top) 1900 (bottom), n/a

New Trent dual battery pack, 500 (out2) 1000 (out1), 1900 (out2) 1900 (out1), n/a

vaio laptop USB port, 500, 460, n/a

In summary:

(1) After trying a few combinations with the thin Retrac retractable cable that I've been using for years, it became apparent that by providing only 380mA, it is useless for recharging the S4. (I had found the main problem, so I did no further testing with the retractable cable.)

(2) Several of my generic chargers are able to supply a sufficient charge when using the S4 cable.

(3) Several of my generic chargers (in particular, the 2 Jet chargers) aren't able to supply sufficient charge, even when using the S4 cable.

As a result of this test, I decided to retire the two Jet chargers and the Retrac cable. I'm going to stick with the stock charger and cable, because it seems to work with all my USB-powered devices.
[Galaxy S 4 General] richardbroder:
Awesome topic. Getting myself a Samsung 2A car charger.
[Galaxy S 4 General] DummyPLUG:
I am using this widget to check the charging current

https://play.google.com/store/apps/details?id=com.manor.currentwidget

I also have a dual usb port 2A car charger (no brand) which can up to 1900 with a logitech usb cable (come with my m950 wireless mouse), but with S4 cable it just can have 1500
[Galaxy S 4 General] haloimplant:
Here's what I got:

Charger Cable Current

S4 S4 1900

S4 N7 1900

S4 Logitech 1900

S4 S1 800

N7 S4 1520

N7 N7 1900

N7 Logitech 1580

N7 S1 740

S1 Any 780

Seems like the S4 charger with any decent cable (the S1 cable seems thinner than the others) will go all out. Oddly the N7 charger would work full out with its own cable, but the other decent cables would only go about ~80%. Finally the S1 charger, roughly as expected, could only put out ~0.8mA regardless of the cable.

I actually might just leave the S1 charger plugged in near my bed, 0.8A will certainly charge the phone overnight. Then I can use the S4 cable around the house and on the go for quick charges during the day.
[Galaxy S 4 General] neoxkid:
How did u make it work? It doesnt matter what charger i plug it always say 0 ma or 1 ma. I saw people writing 1900/1700/1400/1500 but i dont see it.
[Galaxy S 4 General] DummyPLUG:
It didn't support 9500
[Galaxy S 4 General] richardbroder:
Ok guys, so the weirdest thing just happened.

Got myself a Samsung 2A 10w charger that comes with the USB Cable for the SGS4/Note2.

Packed it off, installed it in my car and immediately noticed how long it was taking to charge. Just like the old days I had my SGS2 with cheap chinese car chargers that would actually leave the phone discharging while using it. I left it some minutes trying to charge and nothing, battery % would just keep level. So I took the cable off and it seemed to be STUCK in my phone, physically stuck. I tried to be as gentle as possible, but I still had to use quite a lot of strength to get the cable out. Once out, I put it in and out again, and it was going in and out normally.

Something was not right.

Got the Galaxy Charging Current app and went to do some testing, I also threw in a old Nokia cable I had around my house. Here are the results:

Nothing attached: 460ma

Samsung 2A wall charger + original Samsung USB Cable: 1900ma

Samsung 2A wall charger + old Nokia USB Cable: 1900ma

Samsung 2A wall charger + vehicle Samsung USB Cable: 460ma

Samsung 2A car charger + original Samsung USB Cable: 1900ma

Samsung 2A car charger + old Nokia USB Cable: 1900ma

Samsung 2A car charger + vehicle Samsung USB Cable: 380ma

Computer USB 2.0 + original Samsung USB Cable: 460ma

Computer USB 2.0 + old Nokia USB Cable: 460ma

Computer USB 2.0 + vehicle Samsung USB Cable: 300ma :eek:

Old Samsung Galaxy S2 760ma wall charger w/ embedded cable (just for curiosity): 900ma

So ok, the car charger is fine. The cable is not working for some reason. The funniest thing is that the only cable that does not work properly with the car charger is exactly the cable that came WITH IT. Even my old Nokia cable offered seamingless 1900ma.

Either Samsung is not providing their 2A 10w car chargers with the correct cable or I was a lucky one in a million that managed to get a defective cable (cable getting stuck in my phone tells me this could be the case).

Btw, despite getting the cable "stuck" in my phone, my phone seems to be fine. Everything working ok. Just the cable itself not giving the correct current...
[Galaxy S 4 General] Razzar:
XXUBMEA

Since upgrading to XXUBMEA on I9505 I have not been able to charge at 1900ma, it seems to be capped at 1200ma. Can anyone else on same firmware confirm this?
[Galaxy S 4 General] flash608:
I`m on custom MEA (Omega 5.0) and 1900mA is working flawlessly.
[Galaxy S 4 General] kona786:
what app is that screenshot - looks very useful.
[Galaxy S 4 General] imlgl:
On omega v5 with mea rom. Samsung charger and cable bow only gives me 1200 not 1900
[Galaxy S 4 General] flash608:
I`m on Omega 5.0 and with faux kernel (or Adam) it charges the battery with 1900mA. Do i have to make some screenshots?
[Galaxy S 4 General] Razzar:
It looks like Battery Monitor Widget, you can get it on Google Play

---------- Post added at 11:39 PM ---------- Previous post was at 11:34 PM ----------

The reduced charging rate is on the latest stock kernel (MEA), you won't get the same problem as you're using a custom kernel.
[Galaxy S 4 General] ptolemy2k6:
The most important point we can take from this is the following:

In past, when your charging current was below 1amp, cable quality didn't matter as much. Since high end phones will be coming with high capacity batteries, they will require 1.5a charging. That means that low end usb cables will simply not work.

Same can be applied to other areas, such as buying batteries from quality manufacturers.

Great topic :)
[Galaxy S 4 General] inolvidable:
The same here for GT-I9500. There is something odd though. When I open s view cover I can see for an instant the current at 1900. ¿Could it mean that charging current is lowered while the screen is on in order to prevent overheating?. I'll try to find out.

¡¡So say we all!! from Battlestar GT-I9500
[Galaxy S 4 General] TeeeJaay:
i believe the reason why the charging current lowers is it is diverting some power to the phone, the way it is designed is that if your phone is plugged into a charger it will supply energy to the phone directly and not thru the battery since this will be counterproductive and will greatly reduce battery life

so if you are using your phone while charging and notice that the charhing seems slower it is not that the phone is drawing much power from the battery than the charge but in fact some of the power that is used to charge the battery is directed directly to power the phone
[Galaxy S 4 General] Entropy512:
Yup. It depends on how current is reported. Many older Samsungs (definitely the GS1 and Exynos GS2s) would report total current pulled from the wall. Many other devices (including most Samsung tablets and maybe the GS4) report total current into the battery.

If the device reports total current from the wall, it won't change when the screen is on unless the battery is nearly full (then it will increase). If the device reports current into the battery, it will reduce when the screen is on as more of the current from the wall is going to the CPU/screen than the battery.