Database Users

[Q] Differences in the way that Winmo and Android Fast Charge?

This might be more than a little geeky, but perhaps someone with an knowledge of how the hardware is addressed by the two different operating systems can help me out with further information.
I have been investigating the behaviour of the HTC HD2 whilst charging as I wish to make a car charger and also modify a USB port on a device to fast charge my HD2 (ie turn an O2 Joggler into a charging station).
So I have been analysing the fast charging behaviour of the HD2.
Ok so far? Here is what I discovered.
The HTC charger when connected to the HD2 charges the device with just under 1A at 5v. The current that is supplied is limited by the HD2 itself.
On a standard USB port, the HD2 charges at just below 1/2A, the limit to what a standard USB port is spec'd to deliver.
Here is the interesting bit.
The Data lines (D+ and D-) of the USB cable are supplied with a 3.3v (Approx)) signal from the HTC wall charger. This tells the HD2 that it is safe to draw the full 1A line via the USB cable.
Now on Windows Mobile something interesting happens on the Data lines when the phone is connected. The Lines hold high at 3.3v for 250ms as seen here:
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After that is drops back down. It is even possible at this stage to disconnect the Data lines and the phone continues to draw 1A of current...
Now when Android is running on the HD2, the charging behaviour is different. The Data lines hold high at 3.3v for the whole time that the charger is plugged in.
Clearly under windows control, the data lines are somehow being either switched off at the charger or more likely being sunk to ground at the phone end. Quite why, I'm unsure...
My questions:
Can someone with knowledge of how the OS's operate shed some light on this?
Is there a risk of damage to the data lines from charging under Android?
Should the android drivers be re-written to emulate this windows behaviour?
Should I perhaps get a life??... Ok I think I know the answer to this one!
I am using the Darkstone Sense build and Miri 6.5 V17 FWIW

ooh what oscope you using?? sorry, had to ask i mean it looks alot better than the POS ones we're using to train on

kingofyo1 said:
ooh what oscope you using?? sorry, had to ask i mean it looks alot better than the POS ones we're using to train on
Click to expand...
Click to collapse
The DSO Nano...
http://www.justblair.co.uk/seeed-studio-dso-nano-pocket-digital-storage-oscilloscope-review.html
A little limited, but cheap and very portable, perfect for this kinda stuff...

AFAIK even directly shorting usb data pins work with high current charging. (You can even slide a thin metallic foil to the connector) Some people use chargers with standart usb ports with charging cables that have data pins shorted. (as standart chargers don't have data pins shorted, even if they can provide more then 1/2A)
I have charged my phone under Android a lot times, nothing bad has happened yet. I have used properly/originally shorted microusb chargers from HTC, Samsung and Motorola. All these three chargers have data pins shorted from the factory. Android is able to differentiate AC charging from USB charging.

memin1857 said:
AFAIK even directly shorting usb data pins work with high current charging. (You can even slide a thin metallic foil to the connector) Some people use chargers with standart usb ports with charging cables that have data pins shorted. (as standart chargers don't have data pins shorted, even if they can provide more then 1/2A)
I have charged my phone under Android a lot times, nothing bad has happened yet. I have used properly/originally shorted microusb chargers from HTC, Samsung and Motorola. All these three chargers have data pins shorted from the factory. Android is able to differentiate AC charging from USB charging.
Click to expand...
Click to collapse
Thanks for that, though I am confused. My experiments show that the Data Pins are held in a high state (3.3v) to initiate charging to the HD2. ie the phone decides on the rate of charge according to whether a voltage is present. I am interested in what pins are shorted and why?
I have a test rig now set up, so I can test this for sure, but I am not sure if shorting out the charger (ie connecting data to ground?) is going to be good for its health.
My original curiosity as to the difference between how WinMo and Android instruct the charging circuit still stands.

It is geeky indeed, but I have to say, wall charging under android is soooo much faster thatn on winmo. About twice as fast.
Q: Is that bad for the battery life ? (it may also heat a bit as the result of the fast charging.

nordicfastware said:
It is geeky indeed, but I have to say, wall charging under android is soooo much faster thatn on winmo. About twice as fast.
Q: Is that bad for the battery life ? (it may also heat a bit as the result of the fast charging.
Click to expand...
Click to collapse
Hmmm... Are you sure?
Reason I ask, is that the amount of current drawn by either WinMo is exactly the same.
If what you say is true, WinMo must be "loosing" some of the amps during the charging process. I am unsure as how to visualise this with a scope though it should be reasonably possible to measure the time taken to charge a battery. I have not noticed a difference, however I put mine on charge overnight usually so I am not really aware of how quick or otherwise the charge takes
Interesting thing to test

Justblair said:
Hmmm... Are you sure?
Click to expand...
Click to collapse
Hmmm, well maybe not twice, but I sat down and checked, it can rise up to 1 % a minute in AC charging under Android, never seen this in winmo.
I have also noticed (with the built I am using now) that sometimes I let it charge the whole night, and in the morning, I can only see it charged to 93 or 94 % and not increasing anymore, somehow roofed to 93%, then I unoplug it and plug it back and it start to go up to 100% again at a fast pace....
Strange indeed, I guess not everything is sorted yet...

I have read on the forum some other members saying that charging on android might be damaging to the phone. I'm a little worried about this, but it seems like no one knows if it really is. I have been switching to winmo to charge at night just in case.
I suspect that charging under android shouldn't actually be different, isn't at least some of this stuff handled at the hardware level and not at OS level?

poweroutlet said:
I have read on the forum some other members saying that charging on android might be damaging to the phone. I'm a little worried about this, but it seems like no one knows if it really is. I have been switching to winmo to charge at night just in case.
I suspect that charging under android shouldn't actually be different, isn't at least some of this stuff handled at the hardware level and not at OS level?
Click to expand...
Click to collapse
The only way it could damage the phone is if it was overcharging the battery (charging beyond it's capacity), however the HD2 has a chip that prevents this (google ds2746).

RJackson said:
The only way it could damage the phone is if it was overcharging the battery (charging beyond it's capacity), however the HD2 has a chip that prevents this (google ds2746).
Click to expand...
Click to collapse
Yes, but the hardware depends on software instructions.. Those from the bootloader HaRet, which loads all components.
So as far as I know, if the devs didn't include this in their releases of bèta-android versions, the chip won't act like it's supposed to...

HectiQ said:
Yes, but the hardware depends on software instructions.. Those from the bootloader HaRet, which loads all components.
So as far as I know, if the devs didn't include this in their releases of bèta-android versions, the chip won't act like it's supposed to...
Click to expand...
Click to collapse
Well I think that is serious stuff.
People should be informed that there is a risk, if there is one of course. I mean appart from the "Use at your own risk, you may brick your device... " and all that stuff that is true by the way.
But in the worst case it can only reduce the life of your battery ? And worse case scenario you buy a new battery if capacity it too crapy ? (not extremely expansive).
Please Post if someone has an idea.
Is there an app outhere that check health of batteries and capcity compared to "as new" as we have for laptops ?

memin1857 said:
AFAIK even directly shorting usb data pins work with high current charging. (You can even slide a thin metallic foil to the connector) Some people use chargers with standart usb ports with charging cables that have data pins shorted. (as standart chargers don't have data pins shorted, even if they can provide more then 1/2A)
I have charged my phone under Android a lot times, nothing bad has happened yet. I have used properly/originally shorted microusb chargers from HTC, Samsung and Motorola. All these three chargers have data pins shorted from the factory. Android is able to differentiate AC charging from USB charging.
Click to expand...
Click to collapse
Of course you are right....
I misunderstood what you meant my shorting the pins... Yes joined together the two data pins indeed trigger the fast charge. I have replicated it on the bench.

WM driver checks DMinus level and if it high assume this is AC charger, shutdown USB totally and enable fast charging.
Android driver actually based on google nexus driver and already have this feature implemented. seems it's doesn't shutdown USB.
other device, like desire and nexus also use this kind of AC detection.
I dunno if it can harm device.

A new battery is 10 bucks. A small price to pay for running android before its 'prime time' ready, if theres something wrong. Plus the Devs know more about this stuff then I ever will. I trust them.
Amazon htc hd2 official battery (http://www.amazon.com/HTC-Standard-..._1_1?ie=UTF8&s=wireless&qid=1282068278&sr=8-1)

Anyone else having insane charge times?

I just finally got my phone to die after a lot of use from 10 hours of music, 3 hours of web browsing/facebook, 1 hour of modern combat 4, and a crap load of texting and calls. Well when i plugged it in its charging really fast. I seem to get about 5-8% per minute. is something off or is this just really quick at charging.
EditL ok it took about 30 minutes to a full charge.....

The Samsung charger that comes with the phone has a new chip that charges the phone at 2A so it will be quicker. If you use a different cord it'll go back to being slow.

Yeah I absolutely love this charger. Quickest charge ever.
Sent from my Galaxy S4

Its insane with how it is. on my SIII i used my old Palm Pre charger (old phone i use to have haha i miss the OS of it) but all my other cords got loose and fell out easy but for that cord. I was use to like a 2 hour charge and some wall outlets it would be 3 hours. this is insane for a 30 min charge haha and lasts all day for me.

It's the new Qualcomm Quick Charge technology.

rushco said:
The Samsung charger that comes with the phone has a new chip that charges the phone at 2A so it will be quicker. If you use a different cord it'll go back to being slow.
Click to expand...
Click to collapse
the tricky thing is you also have to use the USB cord they provided as well...the old usb cord in the new 2A adapter won't work
if you notice, it is thicker to handle the extra charge

eyecon82 said:
the tricky thing is you also have to use the USB cord they provided as well...the old usb cord in the new 2A adapter won't work
if you notice, it is thicker to handle the extra charge
Click to expand...
Click to collapse
I'm going to run a few tests using other cords (monoprice, belkin, and a couple others and I will update this thread in a couple days with the amp charge. My hypothesis is that the monoprice cables with a thicker wire gauge will be able to handle the charge but until I run proper tests I won't know.
Oh a question I had for any owners is if anyone's galaxy is getting super hot when charging?

rushco said:
The Samsung charger that comes with the phone has a new chip that charges the phone at 2A so it will be quicker. If you use a different cord it'll go back to being slow.
Click to expand...
Click to collapse
Are you guys sure about this? Qualcomm's site says it's their integrated chipset that facilitates the quick charge, not the cables.
Quick Charge 1.0 makes all this is available to the user with existing USB charging accessories—no new cables and wall chargers to buy.
Quick Charge 1.0 is offered to our customers as an integrated solution (as part of the PMIC, or power management integrated circuit) and
a standalone solution that interfaces to the USB connector. Any phone or tablet’s charging port can be enabled with Quick Charge.
Click to expand...
Click to collapse

sublimeike said:
Are you guys sure about this? Qualcomm's site says it's their integrated chipset that facilitates the quick charge, not the cables.
Click to expand...
Click to collapse
It's the chipset working in combination with a compatible charger. Using a regular charger will work, but charge times will be longer. The "cables" don't have anything to do with it actually. The guy from anandtech did a write up and charge time comparisons in the second section of their review: http://www.anandtech.com/show/6914/samsung-galaxy-s-4-review/2

kyhassen said:
Its insane with how it is. on my SIII i used my old Palm Pre charger (old phone i use to have haha i miss the OS of it) but all my other cords got loose and fell out easy but for that cord. I was use to like a 2 hour charge and some wall outlets it would be 3 hours. this is insane for a 30 min charge haha and lasts all day for me.
Click to expand...
Click to collapse
I finally retired my Pre for the S4.
The usb cable shouldn't matter, as long as it is in the Samsung Charger.

Pheonix28 said:
I finally retired my Pre for the S4.
The usb cable shouldn't matter, as long as it is in the Samsung Charger.
Click to expand...
Click to collapse
I loved that phone. Great OS, sad it didn't go further.
@Powerbird As for charging for me it does not get hot for me, a little warm but that's it. It was only on day one of getting it which weird.
Sent from my SPH-L720 using xda premium

Same as kyhassen here first day phone charger and cord got extremely hot when I first fully charged it. It ran 1day 15hours and am presently charging it and its not hot anymore. The charger was warm at first now it has cooled down that its at 92% I love that it charges really fast and will see how long it last this time.

You guys should have owned the HTC One, One of the reasons I left that phone was because of the 4.5 hour charge time. Ridiculous. Thank God the S4 is way better in that regard.

coojoe1000 said:
You guys should have owned the HTC One, One of the reasons I left that phone was because of the 4.5 hour charge time. Ridiculous. Thank God the S4 is way better in that regard.
Click to expand...
Click to collapse
That's better than how the sgsiii was. Mine took 6-9 hours to charge

eyecon82 said:
That's better than how the sgsiii was. Mine took 6-9 hours to charge
Click to expand...
Click to collapse
It did take a while. But I used a palm pre charger and it was like 3 hours. If i used a aftermarket cord I had it was 12 hours
Sent from my SPH-L720 using xda premium

Im using my note 2 charger and it seem slow charging compared to how fast my note 2 charged. Haven't tried the s4 charger cuz I thought they was the same (2amps). Is there a difference
Sent from my SPH-L720 using Tapatalk 2

I just went to plug my phone into the charger and found this!
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Holy crap! I have mine charging now and I had check it. It's a little warm but it luckily it still doesn't have any holes in it.
Sent from my SPH-L720 using xda app-developers app

thisguyinoc said:
I just went to plug my phone into the charger and found this!
Click to expand...
Click to collapse
WTF!
I am not getting anywhere near 30 minutes. My first charge from dead to 100% with the phone off was about 2.5 hours. I am charging it right now from dead and it has been going for about an hour about 75% done. Wonder if I have a defective charger or cable? Will try a different cable to test first.

thisguyinoc said:
I just went to plug my phone into the charger and found this!
Click to expand...
Click to collapse
crawrj said:
WTF!
I am not getting anywhere near 30 minutes. My first charge from dead to 100% with the phone off was about 2.5 hours. I am charging it right now from dead and it has been going for about an hour about 75% done. Wonder if I have a defective charger or cable? Will try a different cable to test first.
Click to expand...
Click to collapse
same here man

AC charger, is yours 2.0Amps?

I'm really curious why people are saying their Note 3 charges so much faster than the Note II. I'm experiencing identical charging speed for my Korean Galaxy Note 3.
With an external changing case with the included 2A charger that came with the Note 3, I can go to 5% to 100% in exactly 2.5 hours consistently.
Through the USB port 3.0 on my computer, and since the USB 3.0 mode doesn't stay on for more than 10 minutes while idle, the charging is painfully slow through the USB 3.0 port. It'll probably have to go 8 hours.
I haven't tried it but, I'm guessing charging from the AC while the phone is on is going to similar to what I was getting on the Note 2, which is around 3.5 hours.
Are any of you getting different/same results? I'd love to know how many amps is your charger. The Korean Galaxy Note 3 came with a charger that had the 5 pin micro USB cable hardwired into it and it says 2.0A

Lucidmike said:
I'm really curious why people are saying their Note 3 charges so much faster than the Note II. I'm experiencing identical charging speed for my Korean Galaxy Note 3.
With an external changing case with the included 2A charger that came with the Note 3, I can go to 5% to 100% in exactly 2.5 hours consistently.
Through the USB port 3.0 on my computer, and since the USB 3.0 mode doesn't stay on for more than 10 minutes while idle, the charging is painfully slow through the USB 3.0 port. It'll probably have to go 8 hours.
I haven't tried it but, I'm guessing charging from the AC while the phone is on is going to similar to what I was getting on the Note 2, which is around 3.5 hours.
Are any of you getting different/same results? I'd love to know how many amps is your charger. The Korean Galaxy Note 3 came with a charger that had the 5 pin micro USB cable hardwired into it and it says 2.0A
Click to expand...
Click to collapse
My Charger is 2.0A. It's a travel adapter with a USB port on it. It definitely charges a lot faster than when connected to the PC but my PC isn't USB3 so it's not quite a fair comparison. I'm actually wondering about the travel adapter as its USB port isn't blue so I wonder if it's USB3 or not, or if that makes a difference.
I'm curious, what do you mean by "USB 3.0 mode doesn't stay on for more than 10 minutes"?

Note3 charges more or less same speed as note2 for me.

The charger that it comes with is slightly higher than the standard 5 volts.
Sent from my SAMSUNG-SM-N900A using Tapatalk 4

A person at one of those phone kiosks actually told me the Note 3 comes with a 3AMP charger because it has 3GB of RAM!

cpufrost said:
A person at one of those phone kiosks actually told me the Note 3 comes with a 3AMP charger because it has 3GB of RAM!
Click to expand...
Click to collapse
If I facepalm any harder, my hand will pierce through my skull.

neoKushan said:
If I facepalm any harder, my hand will pierce through my skull.
Click to expand...
Click to collapse
That could start a war...
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Scary to think how many people not knowing better get told such bad info...

My charger is 2.0 amps also as for usb3 charge I got a latest Asus motherboard that in a specific usb3 port gives 2amps so usb charging is same for me in there.
Sent from my SM-N9005 using Tapatalk 4

My ATT version GN3 came with 5.3V 2.0A charger that looks exactly like my wife's S4 5.0V 2.0A charger. Her cable is standard mirco-usb and the GN3 is 3.0 micro-usb.

My charger that came with the phone is 2.0A & 5.0V.
It charges (draws current) at 1,200 mah
When it reaches 100% charge, it draws 1,800 mah.

He doesn't know what he is saying...! Note 3 comes with 3Amp charger because its NOTE --》3《-- !!! Note 2 had 2 Amp charger and next year note 4 will have 4! Amp charger....
Sent from my SM-N9005 using xda app-developers app
---------- Post added at 11:09 PM ---------- Previous post was at 11:04 PM ----------
Now seriously..... Did you punch him in his face when he said that...?? Please say yees.. :banghead:
Sent from my SM-N9005 using xda app-developers app

Yup
2.0A, 5.3V

Viptr said:
He doesn't know what he is saying...! Note 3 comes with 3Amp charger because its NOTE --》3《-- !!! Note 2 had 2 Amp charger and next year note 4 will have 4! Amp charger....
Click to expand...
Click to collapse
I second this ridiculous statement!

my note 3 also charges at 1.2A with either usb3 or usb2 cable (from my note 2). My note 2 charged at 1.8A...I'm not seeing any faster-charging benefits...I used the galaxy charging current app to measure.

really? current draw increases after 100% charge
CorruptedSanity said:
My charger that came with the phone is 2.0A & 5.0V.
It charges (draws current) at 1,200 mah
When it reaches 100% charge, it draws 1,800 mah.
Click to expand...
Click to collapse
Did you reverse these numbers or does the current draw actually INCREASE
after the device reaches 100% charge?
~~~ 8d:-] Dan

SaintDanBert said:
Did you reverse these numbers or does the current draw actually INCREASE
after the device reaches 100% charge?
~~~ 8d:-] Dan
Click to expand...
Click to collapse
What do you mean reverse?

Im using a usb voltage/ampere tester adapter which sits in between charger and usb cable.
I can safely say that my original charger with cable charges at 1.8amp. And yes, the voltage is noticably higher than other usb chargers for some reason.
Please do note than delivering 2amp power requires good quality cable. I have tested 3 different cables (original, flat & retractable) with same original charger and the ampere difference is huge. (1.8a, 0.8a, 0.6a).

I noticed that when using the "Galaxy Charging Current Lite", if I refresh while it has been on for awhile I get 1200 if the screen is off and then quickly turn on and refresh I get 1800. I assume the 600 drop is due to the screen being on?

tablighs said:
Im using a usb voltage/ampere tester adapter which sits in between charger and usb cable.
I can safely say that my original charger with cable charges at 1.8amp. And yes, the voltage is noticably higher than other usb chargers for some reason.
Please do note than delivering 2amp power requires good quality cable. I have tested 3 different cables (original, flat & retractable) with same original charger and the ampere difference is huge. (1.8a, 0.8a, 0.6a).
Click to expand...
Click to collapse
Thanks for this detailed response.
Would you kindly try this app:
Galaxy Charging Current Lite
I am constantly getting 1,200.

ItsMeOk said:
I noticed that when using the "Galaxy Charging Current Lite", if I refresh while it has been on for awhile I get 1200 if the screen is off and then quickly turn on and refresh I get 1800. I assume the 600 drop is due to the screen being on?
Click to expand...
Click to collapse
seems fair.. maybe its needed to not force the battery when its charging and using charge...

Quick Charger 2.0 not working on Z2

Hi guys,
I have an D6543 (Brazilian Model), there is no difference between D6503.
I checked the Qualcomm website a lot of times, and Z2 is in compatibility list: https://www.qualcomm.com/products/snapdragon/devices/all?feature=Quick Charge 2.0
So, I purchase the Tenergy Quick Charger 2.0 at Amazon, and for my surprise, it's not working at all. Only normal charging.
I tested at 1%, and in 30 minutes only 11% was charged, VERY, VERY slow.
The light indication at charger is saying that is on normal charging.
I'm really frustrated.

Fastcharging is disabled on xperias for safety
Charging should be between 1-5 hours even without fastcharge

My z2 only take around 2 hours to fully charge from 1%. Just using the stock plug charger.
Sent from my D6503 using XDA Free mobile app

yuskhayru said:
My z2 only take around 2 hours to fully charge from 1%. Just using the stock plug charger.
Sent from my D6503 using XDA Free mobile app
Click to expand...
Click to collapse
I dont think fastcharge is at all posible with the Z2
It charges at 1500mAh using the factory provided charger and trying to go beyond that isnt safe at all.

Envious_Data said:
I dont think fastcharge is at all posible with the Z2
It charges at 1500mAh using the factory provided charger and trying to go beyond that isnt safe at all.
Click to expand...
Click to collapse
i dont know about it, but ive charged my z2 several times from 1% to 100% only take 2 hours - 2 hours and 30 minute. And yes, i've heard people charged thier z2 atleast 4hours to completly fully charged from 1%. My phone is still standard, under warranty(havent mod anything yet and still unrooted).

Envious_Data said:
I dont think fastcharge is at all posible with the Z2
It charges at 1500mAh using the factory provided charger and trying to go beyond that isnt safe at all.
Click to expand...
Click to collapse
I don't know why. Z2 has the Snapdragon 801, which is compatible with Quick Charger 2.0, as Z1 was compatible with QC 1.0.
LG G3 also has the 801, but LG does not enable the QC, that's why it is not at Qualcomm's website. It's weird, because Z2 was recently added to the list, and the main product page says it's compatible.
In the end, I just lost money because their poor support and information.

yuskhayru said:
i dont know about it, but ive charged my z2 several times from 1% to 100% only take 2 hours - 2 hours and 30 minute. And yes, i've heard people charged thier z2 atleast 4hours to completly fully charged from 1%. My phone is still standard, under warranty(havent mod anything yet and still unrooted).
Click to expand...
Click to collapse
As said its pointless trying to increase the charging rate
I learned when pushing it past 1500mAh it starts to damage the device usb port and
battery
victormartins said:
I don't know why. Z2 has the Snapdragon 801, which is compatible with Quick Charger 2.0, as Z1 was compatible with QC 1.0.
LG G3 also has the 801, but LG does not enable the QC, that's why it is not at Qualcomm's website. It's weird, because Z2 was recently added to the list, and the main product page says it's compatible.
In the end, I just lost money because their poor support and information.
Click to expand...
Click to collapse
Not exactly poor support, if its safe to use and certified safe to use sony would have put it in the features list on their website but it wasnt there when i bought the phone nor when i last checked.
As said check my reply
The device charges at as fast as it safely can with the factory provided charger

I'm using envi rom.
I have a normal 2,2A usb charger.
When I use the usb port to charge i have really slow (6h from 0 to full charge) to reasonable charge time (3h from 0 to 100) depending on the used cable.
But when I use the magnetic aftermarket cable than I get insane charge time, only the last 10% from 90 to 100 is not fast but it certainly uses 2A as it is from 0 to 90% in about 90 minutes.
The phone gets slightly warm but far from the temperature it gets with intensive usage and the magnetic connection gets warm too, but nothing alarming imo.
The full metal and glass design makes heat diffuse very fast.

That sucks I'm coming from a one plus one and the charger was very fast.

Envious_Data said:
Not exactly poor support, if its safe to use and certified safe to use sony would have put it in the features list on their website but it wasnt there when i bought the phone nor when i last checked.
Click to expand...
Click to collapse
Qualcomm states it does!
https://www.qualcomm.com/products/snapdragon/smartphones/sony-xperia-z2

I'm using some chineese quick charger 2.1A and it charges 27% in 38min.
Sent from Xperia Z2

Xperia Z2 and Z3 supports Quick Charge 2.0.
You need charger which supports Quick Charge 2.0, though.
http://weekly.ascii.jp/elem/000/000/223/223383/
This site is in Japanese, but it says you'll get 13W when you charge with charger which supports Quick Charge 2.0 and with normal charger you'll get 10W.
Normal charging is already fast enough, so you won't notice big difference.

AndroPlus said:
http://weekly.ascii.jp/elem/000/000/223/223383/
This site is in Japanese, but it says you'll get 13W when you charge with charger which supports Quick Charge 2.0 and with normal charger you'll get 10W.
Click to expand...
Click to collapse
Either they know nothing about electronics or they cannot calculate ^^
1. it should show 9W..... 1.8A x 5V so their meassurement device is not exact (hell, these Wallplug meassurement things are made for 220V ! so you measure 0.045A you can't expect them to be realistic, they're for up to 2000W not so low values.)
2. 9V x 1.8A = 16.2W but this is wrong again as the Quick CHarge 2.0 speccs are up to 4.5A for 9V
So if it really is charching with 9V it only uses 1.44A
Oh... and btw the Stock Sony Wall charger EP880 only has 5V 1.5A
Let's hope some people who know what they're doing are gonna test the Z2 or other phones with Quick Charge 2.0
mr.loverlover said:
I'm using some chineese quick charger 2.1A and it charges 27% in 38min.
Click to expand...
Click to collapse
Doesn't seem like it's working ^^ if you compair to stock charger.
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Envious_Data said:
As said its pointless trying to increase the charging rate
I learned when pushing it past 1500mAh it starts to damage the device usb port and
battery
Click to expand...
Click to collapse
I'm unsure about the battery but this is why QC 2.0 utilizes a higher charge voltage. Also why in computers, all high current devices now run on the 12v rail instead of 3.3v or 5v, because high amperage at low voltage would damage cables and connectors. If we had expensive graphics cards pulling 400w at 3.3v there would be a huge problem with heat and necessary wire size. There is more resistance in metals with high current / low voltage vs. high voltage / low current and this is what can damage the USB port.
This is also why at 120v AC we have issues running high current draw appliances vs 220-240v circuits.
Also why high voltage is more fatal, because it travels more easily through our skin, and etc.

I contacted Qualcomm by email, and they replied to me after a few days.
Xperia Z2 officialy does not support Quick Charger 2.0, only in JAPANESE models.
They updated their website, and removed the information, that's sad.
https://www.qualcomm.com/products/snapdragon/smartphones/sony-xperia-z2
FYI guys, Sony Brazil sells Z2 and Z3 with Smartband, so, our OEM charger has only 0.8A :crying::crying::crying:

Just purchase some charger with 5V 2A output and you will be fine..
I have tried using the standard charger 5V 1.5A if i am correct and it took around 3 hours..
And i tried using OnePlus charger 5V 2A and it is noticeably faster

Haldi4803 said:
Either they know nothing about electronics or they cannot calculate ^^
1. it should show 9W..... 1.8A x 5V so their meassurement device is not exact (hell, these Wallplug meassurement things are made for 220V ! so you measure 0.045A you can't expect them to be realistic, they're for up to 2000W not so low values.)
2. 9V x 1.8A = 16.2W but this is wrong again as the Quick CHarge 2.0 speccs are up to 4.5A for 9V
So if it really is charching with 9V it only uses 1.44A
Oh... and btw the Stock Sony Wall charger EP880 only has 5V 1.5A
Let's hope some people who know what they're doing are gonna test the Z2 or other phones with Quick Charge 2.0
Doesn't seem like it's working ^^ if you compair to stock charger.
Click to expand...
Click to collapse
I've already compared it with a normal 1.5A and it;s charging faster and the device also gets warmer.
I have a lot of apps running in the background, so my results may be other than yours.

Hello,
quick question: is it safe to charge our Z2's by S5 charger - 5,3V and 2,1A?

i dont get this. If the stock charger is 1500mA and the batery is 3200mA it should take only 2h10 to fully charge(more or less). But mine takes like 3h (brand new phone, charger and cable, all stock)

cedropol said:
Hello,
quick question: is it safe to charge our Z2's by S5 charger - 5,3V and 2,1A?
Click to expand...
Click to collapse
quickcharging is disabled by sony for safety reasons.
migueldbr said:
i dont get this. If the stock charger is 1500mA and the batery is 3200mA it should take only 2h10 to fully charge(more or less). But mine takes like 3h (brand new phone, charger and cable, all stock)
Click to expand...
Click to collapse
yes its 1500ma with a 3200ma battery but concider the cpu. your phone is awake for 25% of the screen being off so it should take a over 2hrs10m to charge unless you have xposed amplify installed.

Is fast charging working ?

Hi.. I use the stock charger however even though the notification says it is fast charging .. I dont see it charging fast.. From 26% to 33% it took almost 25mins

You might wanna check on your charger and also use apps like Ampeare or AccuBattery to test the amount of current your phone is receiving.
Sent from my A0001

Ampere won't work.
The V20 will not do quick charge when the screen is on. Quick charge only works when the screen is off.

I was having this issue too, and it appears Facebook was having some kind of problem where the process was using a lot of CPU in the background while the phone was locked. After I killed the process, fast charging worked again (even after FB was restarted). So look for that or any other apps that might be having issues. Given that fast charging was not working for days until I tried this and started working again immediately afterwards, it's unlikely this was a coincidence and something else was the issue (though not impossible).

Quick charge doesn't work when screen is on means you're having too much apps running when the screen is on. trying using greenify.. works for me

I had similar problems a few days ago. There was a terrible bug in Facebook and Facebook messenger where the battery consumption was extremely high. Even with quick charge, the apps were draining the battery faster than its charging.
When I completely shut off the phone, it charges very quickly. So, try that first. Power down and do a quick charge. If it charges quick, then try reinstalling or updating your Facebook and messenger apps.

You will know if quick charge is working because the battery icon in the top right of the screen has a circle around it.
Sent from my LG-H990 using Tapatalk

Wooba99 said:
You will know if quick charge is working because the battery icon in the top right of the screen has a circle around it.
Click to expand...
Click to collapse
I dont get any circle icon for battery can you share a screenshot please

My apologies, just the electrical bolt gets the circle.
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Wooba99 said:
You will know if quick charge is working because the battery icon in the top right of the screen has a circle around it.
Click to expand...
Click to collapse
The problem is that even though it is "fast-charging" it actually charges very slowly. I have the notification saying it is fast-charging and the circle inside the battery but the battery percentage increases extremely slowly.
I had the HTC bolt with quick charge 2.0 and it charged so much faster than the V20.

Wooba99 said:
My apologies, just the electrical bolt gets the circle.
Sent from my LG-H990 using Tapatalk
Click to expand...
Click to collapse
That is fast charge dude.
jamebarron88 said:
The problem is that even though it is "fast-charging" it actually charges very slowly. I have the notification saying it is fast-charging and the circle inside the battery but the battery percentage increases extremely slowly.
I had the HTC bolt with quick charge 2.0 and it charged so much faster than the V20.
Click to expand...
Click to collapse
There are a few factors.
If your screen is on, or if you are using the phone while charging, it will not quick charge. Quick charge only happens when the screen is off. It will charge faster if your phone is powered off.
Also, if the battery rise to a certain temperature, it will stop quick charge too. Similarly, once the battery reach about 80% charge, charging is also slower.

Switch to your lock screen it should say fast charging and when it comes to LG phones the cable matters more than the charger used.
Sent from my VS985 4G using XDA-Developers Legacy app

BozQ said:
That is fast charge dude.
There are a few factors.
If your screen is on, or if you are using the phone while charging, it will not quick charge. Quick charge only happens when the screen is off. It will charge faster if your phone is powered off.
Also, if the battery rise to a certain temperature, it will stop quick charge too. Similarly, once the battery reach about 80% charge, charging is also slower.
Click to expand...
Click to collapse
None of these "factors" hindered the HTC Bolt from charging much much more quickly than this phone, and it uses an older version of quick charge.
I'm familiar with how quickly the phone charges when powered down.
---------- Post added at 02:34 AM ---------- Previous post was at 02:32 AM ----------
LBJM said:
Switch to your lock screen it should say fast charging and when it comes to LG phones the cable matters more than the charger used.
Click to expand...
Click to collapse
It already says it is quick charging! The issue is that the charge rate, even when "quick-charging" is slow as molasses. And the original post clearly stated the stock charger is being used
Do people even read the OP?

jamebarron88 said:
It already says it is quick charging! The issue is that the charge rate, even when "quick-charging" is slow as molasses. And the original post clearly stated the stock charger is being used
Do people even read the OP?
Click to expand...
Click to collapse
In that OP post he doesn't state if he tried a different charger as my post implies, do you even use your critical thinking skills much?
I've had stock LG chargers fail to maintain the fast charging speed even though it stated "fast charging" or in old devices it states charging then switches to "slow charging." The devices I was able to replicate were the LG G Pad 8.3, LG G3, & LG V10. The irony was the Samsung chargers worked best with the LG devices.
Sent from my VS985 4G using XDA-Developers Legacy app

Slightly off topic, but I just wanted to mention how impressed I am with charging speeds when using a PC (perhaps other USB ports?). All my chargers are hard wired Micro USB except for my V20 charger and my Note 7 charger. They both quick charge which I don't like to do so I've been using my PC USB port to charge. It's been getting almost a percent a minute which to me is mind blowing. I'm sure it's slow compared to the regular charger but it's way faster than I've ever seen from a computer USB port before.

jamebarron88 said:
None of these "factors" hindered the HTC Bolt from charging much much more quickly than this phone, and it uses an older version of quick charge.
I'm familiar with how quickly the phone charges when powered down.
---------- Post added at 02:34 AM ---------- Previous post was at 02:32 AM ----------
It already says it is quick charging! The issue is that the charge rate, even when "quick-charging" is slow as molasses. And the original post clearly stated the stock charger is being used
Do people even read the OP?
Click to expand...
Click to collapse
Try disabling Facebook and Facebook messenger and charge again. Or if you know which app is misbehaving, then try disabling that too.

I hope people realize that the stock LG charger can barely be considered a fast charger. It uses the QC1.0 standard while the phone is capable of QC 3.0. LG has never included a proper charger in any of their Quick Charge capable devices.

Found this in lg help..