yashsingh1/xdaforums huggingface dataset:
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
here's another good choice for car http://www.dealextreme.com/p/designer-s-car-cigarette-powered-dual-usb-adapter-charger-72932

dual output, 2.1A and 1.0A
[T-Mobile Samsung Galaxy S II SGH-T989] vybzkartel:
+1. Also try cutting down that standby time. Mine is 30 seconds to go to standby and 1.5 seconds for touch key light duration. 0 - 100% in less than 3hrs. :rolleyes:
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
Why would you want to charge mines? They might explode. ;)

If the battery is 1850mah and the charger is 500mah at the most it will take is is under 4 hours from zero to full. If yours is taking 18hours you have a problem. Either it really IS charged and your indicator is wrong or the charger or battery are defective. You should try going back to stock rom and see what happens.

Mine takes well under 4hrs but I don't fully discharge it. That's not good for the (lithium ion) battery despite what some others may incorrectly say.

There is excellent information here: http://batteryuniversity.com/ on lithium based batteries and what NOT to do with them regarding deep discharge cycles.

---------- Post added at 02:02 AM ---------- Previous post was at 01:56 AM ----------

Not really. The phone is charge current limited probably to no more than 600-650mah. That's controlled by the chipset and the kernel. Go over to the AT&T GS2 board and search for Entropy512's research into the Samsung Galaxy phone's hardware. You can hit it with 10amps and it will only take what it set for.
[T-Mobile Samsung Galaxy S II SGH-T989] :
HAHAHA

You can't stand that peoples phones charge faster than you think they should.

This is the same thing you did in the other thread. Somebody says their charger charged their phone faster, and you come in pretty much saying they're full of ****.

My truck must be broke too, cause it's alternator can charge a battery faster than my cars can.

____________________

Deebo took your bike too?
[T-Mobile Samsung Galaxy S II SGH-T989] madman604:
this is why i think you're wrong. the stated values on chargers/power supplies are the absolute peak output achieved under perfect conditions and typically not under 100% duty, only short bursts/spikes

meaning the 500mAh charger is only trickling out 300-350 mA of juice.

now, throw in a 2A charger and even with the typical losses in efficiency due to heat and other factors, maybe the charger can pump put 600mA-1A constant.

the phone is kernel limited to 650 mAh MAX input, great. The charger fulfills the max safe allowable current. you are now charging at the maximum power and shortest time required.

All that is just my guess, however i do know this: none of my USB chargers rated under 1A can charge my phone while i use it. none.

i was pretty irritated when my phone was almost dead and i drove 20 minutes while charging, only to find it had charged a measly 1%.

while we're on this subject, can someone out there actually test how much current an OEM charger puts out while charging a phone?
[T-Mobile Samsung Galaxy S II SGH-T989] Rekzer:
Using the 1A that came with it, and right now my kindle cable as i left the one that came with it at work...and it charges in 3 hours or so.
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
Yes, I am doing right now. I already have some interesting stats (and photos) but will post them after I discharge the phone battery. It's at 73% when I did the first test but from what I understand the phones hardware and to some extent, kernel, reduces charge rate as the battery fills to prevent overcharge, overheating and possible explosion.

To answer you excellent message:

I wasn't going to reply to these threads anymore because most of those replying don't have a clue but when I saw your message I cheered! You hit the nail right on the head. I agree with everything you said about the chargers. The "better" chargers will be able to produce more current and use up to

the max current the charging circuitry of the device allows

(which is around 650-700mah) and will charge faster up to the current limit of the device! (Soon to be documented)

As you said, charger rating are under NO-load conditions and don't come close to their rated output under load. That is why the "better" or "higher rated" charges will charge faster.

I use a 2500mah Scosche USB charger in my car and it just about keeps up with the device when I am using GPS for long periods.

There were so many of these threads I got confused what I was replying to but in ONE of them I wrote just what you wrote. Hooray! Someone who actually knows what he is talking about and not just talking out of their butt-hole.

What got me going IN ANOTHER thread was the guy who claimed he was able to fully charge his device in 1 hour when the device is current limited to 650-700mah (or even 1000mah which it definitely is not). My "mistake" was I replied in the wrong thread.

So YES, a higher output charger will charge faster up to the limits of the device it is charging (no matter if it is a cell phone or an electric vehicle). To see how long it will take simply divide the battery capacity/max charge current and if your charger puts out that max current you know how long it will take to charge.

I'll post some interesting photos shortly. I'm in the process of making a USB test cable and connecting it to the various chargers I have including and iPad2 wall charger and the Samsung wall charger.
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
Made an "adapter cable" from a M->F USB extender. Cut opened the cable and "broke" the 5V (red) wire and put a multimeter in the line to monitor the charging.

This is the current draw (430ma) from the SAMSUNG wall charger rated at 500mah.

This is the current draw (also 430ma) from my iPad 2 wall charger rated at 2100mah.

Just as a reference this is the current draw (90ma) from my Jawbone Era headset.

And an iPad 2 (drawing 610ma). It won't even initialize charge at all off the Samsung charger.

What I found was upon plugging in either of the chargers to the SGSII charging started at 270 ma and stayed that way for a few minutes then jumped to 430ma. I could "force" the jump by unplugging then plugging the cable

.

What I would like to find out is when the charging current DROPS because when it reaches close to full charge it slowly goes into trickle mode then shuts off.

I was unable to test the charge with phone powered off because it won't power off when attached to the charger. Keeps coming back on. That's either due to ROM (Beastmod) or Kernel or rooting.
[T-Mobile Samsung Galaxy S II SGH-T989] madman604:
MisterEdF , thanks for taking the time to post all this! (not to mention risking your electronics)

so at no point did the phone draw a full 650 mA did it?

also can you test the current draw from an almost fully drained battery? I'll bet its pretty close to 600 mA.
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
At 20% battery it was still the same. At 97% it was down to 250ma. I will try to get it down to where it actually shuts itself off. I also really want to test it with phone powered off & charging but I can't shut off the phone with the cable plugged in. It just restarts. :confused: I may have to go back to pure stock to try that.

Seem to be the wall chargers are supplying a relatively steady ~430ma which obviously is being limited by the circuitry of the phone because you can see the differences in draw between the iPad, Bluetooth and the GSII.

This seems to prove my theory that no matter what charger you throw at this thing it will charge at the same rate and the only difference for various charging times are either:

Bad battery

or

battery not full discharged (or charged)

or

Software or services running on the phone

or

Person claiming 1hr charge can't tell the time ;)

Now if we get a kernel DEV who knows what he is doing he can tweak up the charge rate through the Kernel to maybe 600ma. Battery life may be reduced in the long run and phone might get warmer but it was done by ENTROPY512 with both the Galaxy Infuse and AT&T Galaxy S2 so it can be done. Unfortunately the T-Mo version doesn't have the same developer network as does the AT&T version which is basically the same version as the international I9100.

Hopefully (although I highly doubt it) these tests will convince those who think their devices will magically charge faster with a 100000AMP wall charger that it really can't.
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
I drained battery down until the phone shut itself down and tested it on both the Samsung 500mah charger and the iPad 2 2100mah charger.

Results were the same. Device was taking 430ma from the charger to the battery. There was no initial higher charge rate on either charger, still 430mah. The difference was that when I used the iPad 2 charger I was able to get to the home screen (but loading any app caused a reboot). On the Samsung charger it sat at the "dead battery" screen.

I still would like to be able to totally shut down the device and test it with absolutely nothing running on the phone, just pure charger. The phone being on affects the current draw but that is how it is normally used on a day to day basis.

Ignore the (-)negative reading on the multimeter, I had the leads reversed.
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
After the battery was fully discharged (phone wouldn't even start) I put it in the charger using the 2100mah "hi-powered" iPad 2 wall charger. I was exactly 4hrs 7 minutes until the "fully charged" indicator came up which was just about exactly what it should be based on 1850ma capacity battery/430mah charge rate = 4.30hrs (assuming the meter was 100% accurate which I am sure it is not since it took 4.116 hrs).
[T-Mobile Samsung Galaxy S II SGH-T989] jdiddy_ub:
this is really strange...when i first bought my phone i plugged it into the wall and it took about 3 1/2-4 hours to charge from 0-100%...which is what i expected...ive had the phone for about 2 weeks now...no problem charging at it all...today i noticed that charger wasnt plugged completely into the socket...so i pushed it all the way in...my phone was charging for about 3 hours and only charged like 15%...i thought the meter was off cause i just flashed a new custom rom a little while ago...well...i decided to unplug the charger and plug it back the way i had it before (when it wasnt 100% in the socket)...30 mins later it charged about 15% (which is normal)..and i also noticed that when i had it charging (all the way into the socket) the battery stayed at about 3.7v..when the charger wasnt all the way it jumped to 4v immediately (like it should)...so maybe you guys want to try doing that? charging it without pushing the charger all the way into the socket?
[T-Mobile Samsung Galaxy S II SGH-T989] madman604:
the wall socket or phone socket? weird. i mean either you're getting power or not. why would inserting 1/2 way make a difference?
[T-Mobile Samsung Galaxy S II SGH-T989] jdiddy_ub:
wall socket...i dont know why it makes a difference but it did...if anyone is having trouble charging it, just try it and let me know if its the same
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
I tried it and ended up with a pile of volts and amps on my desk I had to sweep up. Very messy.
[T-Mobile Samsung Galaxy S II SGH-T989] tenxo:
I use battery monitor widget pro, and it shows the states when plugged to AC, USB or discharging. I believe you guys are right on with the fact that it is limited by phone itself on how much charge it will accept. Coming from a HD2 I felt that the charge time from the SII was much slower (i know bigger battery to charge), but it was more evident with using the phones while charging HD2 would still charge...SII will sometimes lose charge.

So I thought it was charger. Found HD2's charger with SII I can use phone and still get a charge. So I got a 2A charger it still takes same amount of time to charge as when using HD2 or SII's 1A charger.

Battery Monitor shows me pulling 554-555mAh max with all three of the above mentioned chargers and even when plugged into USB of my laptop same thing. This sometimes changes it will be saying like 370mAh charge rate at random times not sure if its just the app refreshing or background processes that slows down the current. So phone limits charge input!!;)

Once it gets to the 90%'s charged it will decrease the charge input to like 184mAh and then at 100% it drops to double digits like 20mAh:cool:.

It will also show discharge rate when not plugged in, and with many apps running it will be losing 300's-400's so this would explain why little to no charge if using phone and trying to charge with weaker chargers.

The major difference to why some see improved charge times may be quality vs crap chargers/cables. For me with the SII stock charger it takes closer to 4hrs (sometimes alot more???) to charge from nearly 0-100%, with HD2 1A stock charger or the Vivitar 2A it takes 3.25hrs (and I can be using the phone randomly). I have a motorola car charger (not rapid) that will charge SII while I use it to stream music and such. Then my cheapo ebay car charger will actually only charge phone with everything off (wifi, data screen etc...) like 1-2% in 20min car trip. So a quality 1A is all that's needed really!
[T-Mobile Samsung Galaxy S II SGH-T989] tenxo:
For your safety ALWAYS ensure all your plugs are in properly:eek:. Faster charged SGSII or burned down house:confused: ???

I noticed this before and a reboot fixed the slow charging issue...Something about this phone and charging differences at times just seems weird or maybe its just a samsung thing:cool:.
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
I agree in theory with everything you wrote (in fact I pretty much proved it with my multimeter a few messages back), but I disagree with the Battery App. I have that app and it is WAY off from what is actually being put into the battery as measured with a multimeter. Even given a 10% error in a meter (which it is not that far off) it isn't close.

Bottom line folks is NO MATTER WHAT THE OUTPUT OF THE CHARGER, be it the stock 500ma or a 2.1amp iPad charger the phone will only take what it's chipset allows it to which seems to be somewhere around 450-550mah depending on test device and it's accuracy. The huge variations in charging times some people are seeing are due to other things, some which are very obvious and some which are not. Could be a phone issue, a battery issue or just ones imagination.

Dream and believe what you want about expensive "fast" chargers and this (OR ANY) phone but the laws of Mr. Ohm Mr. Amp and Mr. Watt cannot be disputed.

It is quite clear (and proven in this thread with actual testing with a meter to measure charge current) the circuitry in the phone regulates and limits the charge to a SET amount to prevent overheating, fire and possible explosion. Do all the tricks you want, stand on your heads and plug it in upside down next to a toaster oven, or pray to your God, NOTHING will increase the charge rate of the battery beyond what the chipset limits it to as long as your charger is providing at least 500mah.

The kernel CAN BE (and has been) TWEAKED on other GS2 variations to increase the charge rate but anything beyond 600-650 mah would be dangerous and could lead to a very hot battery or worse.
[T-Mobile Samsung Galaxy S II SGH-T989] :
Go buy the charger I mentioned and test it...... Otherwise you're just testing a few normal chargers. Until you try the faster charger I mentioned, your test is ****.

Btw: ipad and iPhone chargers are slow and so is that normal Samsung charger you used.

You're thick headed.

Edit: Also, you're only testing the chargers output, you have no way to test what the phone actually pulls in. Or what it can handle.

____________________

Deebo took your bike too?
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
Yea, we need some o' dem greased lightnin' amps that are souped up.

Welcome to my ignore list.
[T-Mobile Samsung Galaxy S II SGH-T989] :
@misteredf: While I agree with you that the quality of the charger matters, your tests might be negatively affected by the type/quality of the cable you are using. I can certainly verify from my tests with car chargers that both the quality and type of charger and cables matter. Even with a very good car charger with a 2.1A output, my phone would take a very long time to charge or would even discharge with heavy use while connected to a car when using inferior cables. With a standard cable, the effect was less dramatic but still I would sometimes experience discharging while connected. With the special dongle supplied with my Targus charger, I drove for five hours today with navigation and screen on almost all the way and can report that the phone battery did not discharge and the phone did not overheat though covered with a d30 case and positioned by a vent pumping hot air. The battery charged to 100% quickly and stayed there.
[T-Mobile Samsung Galaxy S II SGH-T989] :
Awwww. Poor baby. Cause im right and since you arent, you try to ignore the truth.

HAHAHA

Take your toys out of the sandbox, cause reality wont let you be right.

____________________

Deebo took your bike too?
[T-Mobile Samsung Galaxy S II SGH-T989] :
Look. I don't want this thread to degenerate into childish di©k measuring. If this is a real issue, then I want to find answers. Biz, I appreciate your perspective and you have stated it before. No need for the taunts, bro. Edf, you'll note that my post was edited at 10:58, while your original post hit at 11:16.

Now, I know edf, that your experience has been that you have not experienced the short charge times others have reported. I think 0 to 100% in one hour seems far-fetched, but I can confirm that if I leave my devices alone and turn off wifi and bluetooth, my two phones will charge fully in about two hours. Have you tried multiple devices and batteries? If so, how many? In addition, have you been keeping records? You say that "measurements were IDENTICAL." I'm no electrical engineer, though both my brother and brother-in-law are. From working with them, I can tell you assuredly that there is not such thing as IDENTICAL when it comes to electrical measurements. There are always differences, even when measuring the same configuration. That's why we do multiple measurements and take the average. Would you care to rephrase? If not, you become guilty of the same hyperbole you accuse others of.

This is not to say that issues don't exist. I'm just trying to help us quantify and delimit the scope of any potential problem.
[T-Mobile Samsung Galaxy S II SGH-T989] MisterEdF:
I was typing after you edited so I didn't see the edit.

Only tested using an iPad and the T989.

Identical means they were within a +-10ma of each other all under the same conditions (phone on and just idling after a reboot). If the charging circuitry on the chip in the phone is controlling the charging current (which it must be or the phone will explode) it could very easily be virtually identical using the same device to test. Please ask your engineering relatives how a 1850mah lithium ion battery can be charged in 2 hours from zero to full when being charged with 600 mah or even 700ma of charging current. If they fully charged in 2hrs then they weren't fully discharged. They may have been 75% discharged or the battery meter was not reading correctly. battery capacity in mah/divided by charging current = #hours to charge within a reasonable range assuming everything else remains steady.

I definitely have had short charging times but it wasn't due to some magic charger or secret sauce but due to the fact the battery REALLY wasn't discharged as low as was indicated by the meter. As an example. After playing some podcast for 1:15 minutes battery meter showed 55%. Plugged in the car charger and it was at 90% within 10 minutes. That is absolutely impossible. The battery indicator simply wasn't correct when it showed 55%.

It's simple math and electronics 101. If it took 1 hr to fully charge with a 600milliamp per hour charge then the battery was only down 600mah which was approx 1/3rd empty based on the battery in this device. Yes, there are some variations but it still pretty much sticks to basic electronics math within a range.
[T-Mobile Samsung Galaxy S II SGH-T989] :
I take the point that the battery metering may be affecting outcomes, and that certainly is an x factor. Your math only holds, though, if we accept your premise that the maximum charging current the device allows is 600-700 mA. But you have not provided sufficient evidence for that claim and your test sample, by your own admission, is one.

I'm not trying to be offensive here, but please drop the condescending attitude. If you can't take criticism or challenges to your ideas, xda is probably not for you.
[T-Mobile Samsung Galaxy S II SGH-T989] :
Always about math 101.... Lol

I give up on this guy. He acts like he's a battery god by using his little meter tester and refuses others input or claims.

Treo, your phones are fine. Why worry about what this one track minded guy says? He obviously isn't as smart as he claims. If he was, he'd try the chargers other than stock. Yet he doesn't. Yet he's a charger and battery god.

My mustang is faster than a souped up Lamborghini, but that's only because I've raced a pinto and won, but never raced a Lamborghini. Yet its still faster than a Lamborghini. But I won't race one, cause my mind state is set and math 101 tells me my mustang speedometer says 180 and a Lamborghinis says 175.

/rant

____________________

Deebo took your bike too?
[T-Mobile Samsung Galaxy S II SGH-T989] :
Even with your math, which I don't concede because of all kinds of real world variances, at the 700 mA rate, the charge should take roughly 2.6 hours. Adjusted for metering issues and residual battery charge, you see it is quite possible to fully charge this battery from apparent 0 to 100 in close to 2 hours. And this does not even address the possibility of a rapid charger changing the base rate. If a phone is taking more than 3 hours to charge perhaps process is drawing high amounts of power and affecting its ability to accept the charge.
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
?

Very informative Thanks!

However, this test shows only the current going from the charger to the phone

I wonder if, we'll be able to see the battery mAh draw difference when all features are in use WiFi or 4G downloading uploading, while Bluetooth is streaming music to either a BT headset or something like that, and using GPS as the same time

this is the scenario when the battery drops faster than the recharge rate can supply using the stock charger

and where the "speed chargers" are able to charge the battery and keep it from draining.
[T-Mobile Samsung Galaxy S II SGH-T989] :
I wholeheartedly agree. I think the methodology might need some tweaking because the 2A

fast chargers are obviously doing more than the present configuration seems to be able to measure.
[T-Mobile Samsung Galaxy S II SGH-T989] khoadpham:
Mine is slow too
[Android Software/Hacking General [Developers Only]] aryehzev:
i got the new Samsung galaxy player running android 2.3.5 and i wanted to know if there is anyway that i can root it?

thank you in advance...
[Android Software/Hacking General [Developers Only]] BXWolf92:
http://xdaforums.com/showthread.php?t=1321582#

Your answer lies here.
[Android Software/Hacking General [Developers Only]] aryehzev:
I installed the samsung program Kies and then i opened the program for the rooting and it just said waiting for device...

and it didn't do anything, is there any other method to root my device or is there something i did wrong?

thanks,

Aryeh
[Android Software/Hacking General [Developers Only]] ppeterpp:
Install samsung usb drivers.
[Android Software/Hacking General [Developers Only]] aryehzev:
i installed kies and it still didnt work. are'nt the Samsung drivers included with kies?