Database Develop

HTC Fast charging ?

Hi,
I just stuck here, cause I found a thread about fast usb charging. But there is no answers or solutions.
I have many htc devices. It seems that some of them has a problem with 3rd party usb chargers.
My most used device is Universal. It suck a lot of power. THis one doesn't enable usb charging at all, until you put it in sleep mode before pluging the charger.
Anyway, the same issue for Kaiser too.
The problem is, that it doesn't matter how much current is the charger able to deliver. They just use some kind of recognition of original chargers.
What I already measured: Original charger and universal running => takes 1200mA. 3rd party charger or my 5A PSU => Universal/Kaiser sucks just 500mA.
This is fast/slow charge. I found here discussion about 4 and 5 pins shorted??
But WTF which 4 & 5 pin?
http://www.tracyandmatt.co.uk/blogs/index.php/2006/09/10/htc_hermes_usb_connector_pin_config
According to this pinout. It would be 2 GND of Audio side? I'm not sure that original charger use extUSB audio side to charge...? It also could be D & A pins, but I'm afraid to connect 5V to Data- pin.
Anyway, someone here have to know it.
If not, in a few days I'll try all possible combinations and post the results.
Thanks
Shef

I'd also be interested to know about this. When I charge my TYTN II via USB, it takes much longer to charge than if I charge it via the mains charger (I prefer USB since I travel a lot and it's one less charger I need to carry around).
Better still, is it possible to buy a USB cable that will charge at the same rate as the mains charger rather than messing with a USB cable with the associated risks?
Best,
Gary.
Shef said:
Hi,
What I already measured: Original charger and universal running => takes 1200mA. 3rd party charger or my 5A PSU => Universal/Kaiser sucks just 500mA.
This is fast/slow charge. I found here discussion about 4 and 5 pins shorted??
But WTF which 4 & 5 pin?
http://www.tracyandmatt.co.uk/blogs/index.php/2006/09/10/htc_hermes_usb_connector_pin_config
Click to expand...
Click to collapse

a usb port only supplies 500ma, while the wall charger does 1200ma as the OP has measured (although it says 1A at the back of the charger). changing a cable is not gonna superpower up your usb port.

unless maybe you get hold of a forked USB cable, like the one that Seagate Free Agent drives come supplied with... you know, 1 mini USB splitting halfway down to two normal USB plugs.
Worth experimenting with, do you think?

wyrm said:
unless maybe you get hold of a forked USB cable, like the one that Seagate Free Agent drives come supplied with... you know, 1 mini USB splitting halfway down to two normal USB plugs.
Worth experimenting with, do you think?
Click to expand...
Click to collapse
good call.......with a little googling i came up with this
http://www.universaluk.com/acatalog...2_x_Type_A_to_mini_B__USB_2_0__1m__Lindy.html
tried ebay, my brief search came up with lots of unrelated results, so i gave up

I got one of those leads, came with my portable 2.5" hard drive. Just tried the lead on my Tytn 2 and it does charge almost as fast as the mains plug

Success
Ok, so, I tried to experiment.
Here you go.
Usb simple cable 480ma charge.
The same result with Motorola charger.
Motorola charger pins A and B short circuit - 890mA.
That's much better, althrough I suppose it can suck more current then 890mA, but it's significantly better.
THere is also pins data+ and data- short circuited (I don't know if it has effect, but I can't disconnect it in this connector).
Apparently NC (not connected) pin on our pinout schematics definitely is connected.
With % of charged battery it suck less and less current....I suppose it's usual, this should be even driven by ROM.
So, update your cables
It works even with car charger, so no more charger problems...
Shef

Just to be clear - you took a Motorola USB cable and shorted pins A and B (which are which by the way?) and it provides a decent current....
How do you short the pins? I've looked in the end of cable and I can hardly see the pins, let alone short them! What's the trick here or have I missed something?
Thanks,
Gary.
Shef said:
Ok, so, I tried to experiment.
Here you go.
Usb simple cable 480ma charge.
The same result with Motorola charger.
Motorola charger pins A and B short circuit - 890mA.
That's much better, althrough I suppose it can suck more current then 890mA, but it's significantly better.
THere is also pins data+ and data- short circuited (I don't know if it has effect, but I can't disconnect it in this connector).
Apparently NC (not connected) pin on our pinout schematics definitely is connected.
With % of charged battery it suck less and less current....I suppose it's usual, this should be even driven by ROM.
So, update your cables
It works even with car charger, so no more charger problems...
Shef
Click to expand...
Click to collapse

Also interested in how to short the pins. I use Navizon, bluetooth HSDPA tethering, and iGuidance while on the ambulance and even my iGo 3A max rated charger can barely keep up because the tilt wont accept all of the available current.

So have anyone found a way to fast charge our ppc through usb??

Yes, that is correct. Short pins 4 & 5 (4 is normally NC) to enable fast-charging. If you do it correctly, the phone shouldn't pick up tethering, and therefore should not say "PC Connected" or the like..
The TracyAndMatt pinout is wrongly numbered. The pin assignments are correct, but the number/letter scheme they used is incorrect. True ExtUSB pinout translation to their pinout is as follows:
T & M Real ExtUSB
-------------------------------
Pins E D C B A = 1 2 3 4 5
Pins 1 2 3 4 5 6 = 6 7 8 9 10 11
The way I remember is that the corner opposite the angled one is where pin 1 starts (where E is on the T&M pinout) - and they go like most IEC-standard connectors, in a clock-like circular numbering scheme.
Here's a better pinout: http://pinouts.ru/PDA/htc_extUSB_pinout.shtml
Hope this helps!
--W5i2

its the milliamps that is the problem even doubling up with a y splitter does not do much Find a charger with the most milliamps for a faster charge 1.2 amps works best and as far as i know no usb port puts out that much even if they are wired in a series. Many try to sell lower amp chargers they dont even know about it at att. if the screen is off they will charge but not well these phones are energy hogs. I must have at least twenty chargers and messed around with them... the original or one of highest amperage works for me.

Check winhlp.com/node/855 for the answer.

htc_battery_trout.c said:
/* A9 reports USB charging when helf AC cable in and China AC charger. */
/* Work arround: notify userspace AC charging first,
and notify USB charging again when receiving usb connected notificaiton from usb driver. *
Click to expand...
Click to collapse
I find this annoying. I can't tell if my wall charger is fast charging or not because the G1 always says "AC"
hgmichna said:
Check winhlp.com/node/855 for the answer.
Click to expand...
Click to collapse
That is not going to help HTC owners.

HTC charging cable
kiss_se said:
That is not going to help HTC owners.
Click to expand...
Click to collapse
http://winhlp.com/node/855 was explicitly written for HTC smartphone owners.

hgmichna said:
[...] was explicitly written for HTC smartphone owners.
Click to expand...
Click to collapse
Sorry, I meant to say: That is not going to help extusb owners.

hgmichna said:
Check winhlp.com/node/855 for the answer.
Click to expand...
Click to collapse
Is it possible to get one of the 'fast charge' enabled USB cables on eBay or elsewhere? I am not keen on doing the mod described.
What is the maximum mAh recommended for HTC devices? Is it still 1.2 A or more?

zurpher said:
Is it possible to get one of the 'fast charge' enabled USB cables on eBay or elsewhere? I am not keen on doing the mod described.
Click to expand...
Click to collapse
Check http://winhlp.com/node/855#qaes for the only buyable solution I know, besides compatible chargers. Your best bet is probably the original HTC charger, available for roughly $10.
zurpher said:
What is the maximum mAh recommended for HTC devices? Is it still 1.2 A or more?
Click to expand...
Click to collapse
There can be no recommended maximum mAh. There can only be a required current, which differs from device to device. Check Ohm's Law. The device determines how much current it draws. If the charger cannot deliver that current, then the charging process can fail in various ways, all undesirable.

hgmichna said:
Check http://winhlp.com/node/855#qaes for the only buyable solution I know, besides compatible chargers. Your best bet is probably the original HTC charger, available for roughly $10.
There can be no recommended maximum mAh. There can only be a required current, which differs from device to device. Check Ohm's Law. The device determines how much current it draws. If the charger cannot deliver that current, then the charging process can fail in various ways, all undesirable.
Click to expand...
Click to collapse
Could the USB Switching 2A Power Charger Adapter Convertor Plug be similar in function to the one that you've linked?

zurpher said:
Could the USB Switching 2A Power Charger Adapter Convertor Plug be similar in function to the one that you've linked?
Click to expand...
Click to collapse
I don't know, but probably not. Apple used to use a different signalling scheme involving resistors.

Using different chargers question please

I have numerous chargers at home all of which have charged my evo, gs2, Nexus 7, etc.
Can these be used interchangeable in the Note 2 without harming the charging process?
Thanks

As long as the Voltage is the same (5V) there is no Problem. But you should have a charger at 2 Amper for optimal charging speed.

I just tried charging mine with the normal microUSB charger I use for every other phone I have had and it took 7.5 hours to charge from 5%-62%. I used the stock charger that was in the box and it charged it in 3.5-4 hours no problem. Seems like the charger in the box charges faster.

reading this thread made me curious, my NOTE II should arrive in about a week, I can't tell for myself yet, what is the A (amps) specification mentioned on the original charger?
as i come from HTC, my current chargers go up to 1 A current. witch is the double A a standard USB port will give unless crossover'd .
thanks in advance!
----
in the wiki thread i found the answer, the supplied charger delivers 5 V 2 A output to the device.

WendigoNL said:
what is the A (amps) specification mentioned on the original charger?
Click to expand...
Click to collapse
2A! Same as the Tab 10.1 charger.
Filling a 3100mAh battery requires some grunt.

i think even the usb cable makes a difference..
when i use the stock usb cable with the stock charger ..my s3 would charge up comparatively faster than with the other usb cable connected to the same stock charger.:rolleyes

max.android said:
i think even the usb cable makes a difference..
Click to expand...
Click to collapse
It certainly does! :good:
All electrical cables have some resistance. Very low (but not zero) for quality cables, sometimes quite noticeable for thin and cheap offerings.
From Ohm's Law we know that voltage drop will be proportional to current. A cable with a resistance of just half an ohm will loose about 0.5% at 50mA. That's pretty much nothing. However, at 2000mA the loss reaches 20%.

dude use any charger, just don't use LG charger **** !!!!!

You must use the 5volt 2amp charger and cable provided or a replacement with the same output or youll either be waiting for ever for it to charge or do some damage.
I tryed using my note 1 charger rated at 1amp and guess what? It took about twice as long to charge.
Sent from my GT-N7100 using xda app-developers app

Some of my old 1 Amp chargers aren't happy at all, and will often decide to stop charging randomly.
I though it was something weird with my phone, but after switching chargers it never happened again.
- Frank

USA official charger
This are the images of the official USA charger that will comes when they release the device in USA
And yes its a 2.0A charger, so the SIII charger isn't appropriate for NoteII.
this is the kind of charger used in Canada, USA, and Latin America, i bought this NoteII in Mexico from an authorized Samsung provider, of course factory unlocked 710usd, like 10,900mxn.

Has anyone tried a 3A charger? Just wondering if this would speed up charging even more than the standard 2A charger.

mcdill the pig said:
Has anyone tried a 3A charger? Just wondering if this would speed up charging even more than the standard 2A charger.
Click to expand...
Click to collapse
No, it won't speed it up. It's what the device takes from a charger, and not what a charger can potentially supply. If the device's charging circuit is spec'd for up to 2A current, that's what it will suck out of a charger, not more. You can connect a 30A lab power supply, and it will still be the same 2A (or less) input. To speed up the charging process, you need to mod the charging circuit of the device itself.

Man I'm confused, Kensington Charger don't work with Asus Tablets?

EDIT - Post #6 has a quote from Kensington confirming the charger does not work with the Nexus Tablet
So been trying to get a dual-USB 2.1A charger to use with my Nexus 7 and my old desire-Z phone (I also have a 1st gen iPad so figured would be a nice perk for both ports to deliver that juice).
I even went as far as buying a new USB Cable thinking something was wrong with my cable and flashing a couple of different kernels (thinking it was maybe that).
Fact is whenever I plug my N7 into a Kensington AbsolutePower 4.2 w/ PowerWhiz (K39690AM), Battery Monitor Pro widget will say in green "AC Plugged", "Discharging", and if it does show "Charging", it's only drawing in around 130mA or so. But yet on my Desire-Z (G2) I plug that in, it'll show maybe around 500mA (it won't go over 1A because it's designed not to for smart phones).
However If I plug the N7 into a Samsung 2.1A charger that came with a Galaxy Tab 2 7.0, The N7 will show a power draw from the charger a little above 1,800mA (and then goes down to around 500 or less once it hits 99%), similar situation with the samsung charger + my G2.
So I'm constantly googling trying to figure out whats up, and the only thing I've come across are various reviews on Amazon (they list this as a Dual 2.1A USB charger), with some complaints saying they don't work with Asus Tablets and another saying it wouldn't charge much at all on his Nexus 10.
So I'm wondering... what's up with that, and why does it not say it's not compatible on the box (though guess they sort of did by excluding Asus and Google from the list of brands on the side).

Its charging. Just the os is not showing it properly
Sent from a phone that's 2 Note-worthy, via XDA Premium HD app.

madman604 said:
Its charging. Just the os is not showing it properly
Sent from a phone that's 2 Note-worthy, via XDA Premium HD app.
Click to expand...
Click to collapse
As I said, I'm using Battery Widget Monitor Pro. IF it was only the OS it would show the exact same deal with the Samsung 2.1A Charger, Nook 1A charger, HTC 1A charger. But instead on ALL chargers except the Kensington one, it shows a much higher charge rate (on the 1A around 800mA charge, on the Samsung around 1.7A charge).
But on the Kensington one never more than 500mA (usually around 300-400). I even exchanged the unit for a new one, and still the exact same behavior. I think the powerWhiz feature of the charger is detecting it not as a tablet but rather as a generic USB Device and is not providing more than 500mA for 'safe' charging. Just like how it won't charge my phone past 1A since it's detected as a SmartPhone even though it's a 2.1A port.

kbeezie said:
As I said, I'm using Battery Widget Monitor Pro. IF it was only the OS it would show the exact same deal with the Samsung 2.1A Charger, Nook 1A charger, HTC 1A charger. But instead on ALL chargers except the Kensington one, it shows a much higher charge rate (on the 1A around 800mA charge, on the Samsung around 1.7A charge).
But on the Kensington one never more than 500mA (usually around 300-400). I even exchanged the unit for a new one, and still the exact same behavior. I think the powerWhiz feature of the charger is detecting it not as a tablet but rather as a generic USB Device and is not providing more than 500mA for 'safe' charging. Just like how it won't charge my phone past 1A since it's detected as a SmartPhone even though it's a 2.1A port.
Click to expand...
Click to collapse
The N7 has a circuit to detect whether the USB cable is plugged into its charger or into a regular USB port. The N7's charger shorts the two data pins. If your charger doesn't short those two pins, the N7 will never go into "high charge" mode.

There is a simple mod to do. Either take the charger apart and short what the data pins should be on the usb port or short the data wires together in a cheapo usb cable at the micro usb side. That will make a charge only cable but it will give. What you need.
Sent from my SPH-D710 using xda premium

So turns out I wasn't crazy after testing two of their chargers.
Dear Karl:
Thank you for contacting Kensington Technical Support.
We understand that our Absolute Power™ 4.2 Dual Fast Charge is not charging your Nexus tablet properly, we regret to inform you that Absolute Power™ 4.2 Dual Fast Charge for Tablets is not compatible with Nexus Tablet, hence we would be glad to refund you the amount.
If the date of purchase is within 90 days, we request you to utilize the 90-days Money Back Guarantee policy.
Please click on the following link to know about the 90-days Money Back Guarantee form
http://www.kensington.com/kensington/us/us/s/1570/90-day-money-back-guarantee.aspx
We are sorry for the inconvenience caused.
If you need further assistance, please feel free to reply to this message.
For any further assistance please feel free to reply back to this email or you may want to call us on our toll-free number 1800-535-4242, Mon Fri 07:30 am to 04:30 pm PST.
Please Read This!
Kensington Technical Support incidents are only processed via our support web site, not via email. Please do NOT reply to this email, but rather you must click on the link below which will bring you to the Kensington Technical Support web portal where you can initiate questions, modify your active incidents, or perform maintenance on your support account.
Again, please do NOT respond to this incident via email, please click on the link below to access your support incident. Thank you.
http://www.kensington.com/kensington/us/us/s/1708/mystuff.aspx
Kensington Computer Products Group
Regards,
Shiva Kumar
Click to expand...
Click to collapse

graydiggy said:
There is a simple mod to do. Either take the charger apart and short what the data pins should be on the usb port or short the data wires together in a cheapo usb cable at the micro usb side. That will make a charge only cable but it will give. What you need.
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
Yea... I'm not taking apart a charger. I just returned the second one to the store where I got it and got one that did work. Also that method won't work with the kensington, with it's powerwhiz feature if it can't detect the device it'll limit to 500mA for safety.
Besides I've already returned the second charger (I exchanged the first one, re-ran tests, etc), and ended up getting an RCA 4-outlet power strip/surge protector that has two USB ports (one for 2.1A charging) that does work.

All android devices look for 200ohms on the data pins to determine if it is a charge vs data source. Except the handful of proprietary connections (ex:Nook Color).

Yep. All things said in this thread are true. What I've found to work great with the stuff I already have is a Samsung Galaxy S4 charger. That thing
charges the N7 at about 1500 mA. Measured with my multimeter. It's weird though,
it'll start around 800mA and after about 45s to a minute it will start pulling in almost double that.
Crazy.

Ativ S charging time

Hello guys.
How long does it take for you to charge your Ativ S?
Mine takes about 5 to 6 hours. I think my charger is defective. I checked through the diagnostic app with *#0228# code and it was reporting 400 to 500 mA current. Tried with another 1A charger and diagnostic was reporting 898 mA charging current and phone was charging much faster. 30-40% per hour.
Thanks for any replies.
Sent from my GT-I8750 using Tapatalk

~2-3 hours for mine, which is closer to what you got out of the second charger. I assume you're referring to the things that plug into the wall? I usually just use my computer's USB port, which may or may not be able to push enough power to charge the phone rapidly (mine is, or close enough).

Yes, I mean the wall mounted charger. Then definitely my charger is defective. I'll have it replaced.
Thanks.
Sent from my GT-I8750 using Tapatalk

johnnymm123 said:
Yes, I mean the wall mounted charger. Then definitely my charger is defective. I'll have it replaced.
Thanks.
Sent from my GT-I8750 using Tapatalk
Click to expand...
Click to collapse
I had the same problem at the begin. My ATIV S was charging for ages so I took a Samsung mic usb cable from my sister and now my phone needs about 3h to be fully charged.
As I read on other forums there are more people having the same problem so that Samsung produced some defective cables and they are still selling them...

its just a simple case of Maths
1A charger should take half as much time than a 500mA charger, your computer USB socket will be about 500mA, of course if the device is powered on then you need to deduct some mA for the device to power itself, 100mA unloaded sounds reasonable for that.
Device has a 2300mAh Battery, if your pumping 800mA in to it your looking at around 3 hours, 6 hours if its around 400mA
if your old adaptor was rated at 1A then its possibly faulty, but its also possible the device maybe restricting it, some devices wont draw its full amount if the COM cables are not connected, some chargers don't bridge the COM pins thus the phone thinks it isn't able to get its full load and may only draw a limited supply. Usual suspects for these chargers are those sealed ones with a cable attached.

dazza9075 said:
its just a simple case of Maths
1A charger should take half as much time than a 500mA charger, your computer USB socket will be about 500mA, of course if the device is powered on then you need to deduct some mA for the device to power itself, 100mA unloaded sounds reasonable for that.
Device has a 2300mAh Battery, if your pumping 800mA in to it your looking at around 3 hours, 6 hours if its around 400mA
if your old adaptor was rated at 1A then its possibly faulty, but its also possible the device maybe restricting it, some devices wont draw its full amount if the COM cables are not connected, some chargers don't bridge the COM pins thus the phone thinks it isn't able to get its full load and may only draw a limited supply. Usual suspects for these chargers are those sealed ones with a cable attached.
Click to expand...
Click to collapse
Mathematics doesn't matter when the cable is broken. I tested both cables with the wall charger and with one my battery was fully charged after 3h and with the other in about 7h

CodingBird said:
Mathematics doesn't matter when the cable is broken. I tested both cables with the wall charger and with one my battery was fully charged after 3h and with the other in about 7h
Click to expand...
Click to collapse
did you read my comment about COM aka data? a broken power cable will either work or it wont, it doesn't resist enough to reduce the current by 50%, even if it was resisting it would take a droop on voltage not current, a broken or disconnected data cable can stop the device / PSU from taking / providing enough current

Slow Charging??

Hey Peeps
Anyone else getting slow charging on SM-T810?
Using the bundled charger, I am getting average of only 680mA .... Definitely nothing over 950mA and that is even when screen is off...
Using the same charger and cable on my sony xperia Z3 easily achieve 1400mA ...
Same sort of numbers with other chargers etc... So pretty sure it is device not charger...
Sent from my D6653 using XDA Free mobile app

I just tested and am getting around 1500 mA. That is with my nexus 6 charger.
Bundled charger gives me around 1460 mA.

Are you certain it`s not the app that is wrong as the S2 is new and the app might not have been updated yet, Try the Samsung charging app below, you have to keep pressing the refresh button on the free version.
https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free&hl=en
John.
lu99ke said:
Hey Peeps
Anyone else getting slow charging on SM-T810?
Using the bundled charger, I am getting average of only 680mA .... Definitely nothing over 950mA and that is even when screen is off...
Using the same charger and cable on my sony xperia Z3 easily achieve 1400mA ...
Same sort of numbers with other chargers etc... So pretty sure it is device not charger...
Sent from my D6653 using XDA Free mobile app
Click to expand...
Click to collapse

The charging rate can be anything from 300mAh to the maximum the power adapter can output, the tablet will determine the amount of power it will accept, and will jump from fast to slow charge depending on how much more power is needed until it reach 100%.

Thanks guys - obviously does not seen to be wide issue.
I tried the Samsung app above ... Sort of showed similar values ....
I did a charge from 69% to full and it took about 1.5 hours... So would be maybe 5 hours to charge fully?? Unless the device does much quicker charging at very low battery??
I will do a full discharge down to say 5% and then charge from there and see how I go.
Thanks again
Sent from my D6653 using XDA Free mobile app

I would install battery monitor widget from 3c on the play store.
A pretty comprehensive battery app and will give you a full history and time line of charging and discharging cycles.

lu99ke said:
Thanks guys - obviously does not seen to be wide issue.
I tried the Samsung app above ... Sort of showed similar values ....
I did a charge from 69% to full and it took about 1.5 hours... So would be maybe 5 hours to charge fully?? Unless the device does much quicker charging at very low battery??
I will do a full discharge down to say 5% and then charge from there and see how I go.
Thanks again
Sent from my D6653 using XDA Free mobile app
Click to expand...
Click to collapse
Normally it will trickle charge slow once it reach approximate 80%, and is normally fast if the unit is almost power empty.

It's annoying. I've tried both ipad chargers and a 2.4A charger, but it will go to slow charging mode with anything else than the bundled charger.

Apoxx said:
It's annoying. I've tried both ipad chargers and a 2.4A charger, but it will go to slow charging mode with anything else than the bundled charger.
Click to expand...
Click to collapse
Yeah i have found exactly the same!! Must be some sort of Samsung handshake protocol...

There is another thread on this that I have mentions about this, just use a good quality charger, or just go for a Qualcomm QC 2.0 charger from any known brand like htc, aukey, xpower, lots to name, just searh Qualcomm site for a full list.
It won't used the QC2.0, but all should work just like the OEM Samsung one

the ipad charger should be pretty high quality though, so I don't get why it's being so picky.

Apoxx said:
the ipad charger should be pretty high quality though, so I don't get why it's being so picky.
Click to expand...
Click to collapse
If you also followed the tab S thread, it's also been mentioned, Samsung tabs S are also picky, and yes all apple stuff don't work.
Should I rephrase it and say some good quality charger will work, even branded ones like sony may not even work, but my intital testing, most QC 2.0 charger will work.

The issue is that I'm trying to find one charger that will charge both my tab s2 and my iphone 6+ quickly. Any idea how qc chargers fare with iphones? The bundled tab s2 charger only gave my iphone 0.4A (it charges the tablet at 1.5A)

I have both sony and asus chargers with included cables work perfectly with iphones and sony xperia z3 and nexus 7... Hopeless with S2.... But s2 charger works fine with them..

lu99ke said:
I have both sony and asus chargers with included cables work perfectly with iphones and sony xperia z3 and nexus 7... Hopeless with S2.... But s2 charger works fine with them..
Click to expand...
Click to collapse
Odd, my old Nexus 7 2012 charger fast-charges my S2 710 without any issue at all. I had it spare as the N7 died on me (the S2 is its replacement) and was initially wondering myself as I had a few supposedly 2A chargers at home which only slow-charged the S2 (or indeed under Android 5.0.2 said it wasn't charging at all, even though it evidently was, but 5.1.1 has fixed that).
That said this is a charger without fixed cable (but with a decent USB cable) and I know from Raspberry Pi experience that the cable is almost as important as the charger for getting decent charging (ie enough current) to the device on the far end.

I would make sure the USB cable is a decent one intended for charging.
Proper charging USB cables have the shield connected at both ends for use as ground which is why they are notably thicker.

ashyx said:
I would make sure the USB cable is a decent one intended for charging.
Proper charging USB cables have the shield connected at both ends for use as ground which is why they are notably thicker.
Click to expand...
Click to collapse
I agree, a good quality cable is required, as well as the charger itself, I'm using a magnetic cable and a reversible micro USB cable with a OEM Samsung, Aukey and Xpower charger, I don't get the speed of the QC 2.0, but it isn't suppose to as the S2 is not QC 2.0 compatible, but it does charge pretty quick, it also charges my ipod 4, and my nw-ZX2 work without any problems.

I get the "slow charging" message when using the Galaxy Tab S2 bundled charger.
If I use the charger from my Note 4 (Exynos) I get faster charging and no "slow" warning.
Did Samsung bundle it with the slow charger??

I can confirm that samsung did in fact bundle the tab s2 WITHOUT a quick charge usb charger.
I also thought the tab s2 didnt come with quick charge. I have extremely slow charge times but my battery lasts for DAYS... I can fully charge it, put it in airplane mode and check on it after 2 days and be at 98-99% battery.
I also use the quick charge cable AND the quick charge usb adapter that came with my note 5 and the tab still slow charges..

Here the same problem use Samsung charger and cable charge from 20% to 100% in 6 hrs and when use HUAWEI cable with Samsung charger It charged in 2 hrs
I guess Samsung have poor quality cable *-*
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