Develop Bugs

Quick Charging USB Adapter... Any thoughts?

I am considering buying this usb charging adapter cable to help speed up my charging rate at work where I don't have an AC adapter and my work computer's usb ports are conveniently placed. From what I have read, normal usb charging maxes out at 500ma, but can be increased if your usb port has more juice if you short the data wires, which will tell the phone to grab more power because it thinks it is plugged into an AC adapter.
I have found this adapter http://www.dealextreme.com/p/usb-data-charging-extension-cable-for-samsung-p1000-black-91141
it is meant for a galaxy tab, but From what I see is that it has a switch that either allows data / slow charge or allows quick charging. I have purchased a few of these already because I'm assuming it will still work with my galaxy s2.
I'll let everyone know how it goes, but does anybody see a problem with this or think I'm going to fry my phone for any reason?
Thanks.

very interesting, heck it's only $3 bucks, might as well just buy it and find out
yes, charging via USB port sucks, it's too slow at 500 mAh
if that does the magic trick, by shorting it and making it believe it's an AC then it'll be nice, and it can pull around 1000 mAh off the USB port (depending on your computer mainboard)

Id be curious to see if this actually works but i see no fault in trying it

cbutters said:
I am considering buying this usb charging adapter cable to help speed up my charging rate at work where I don't have an AC adapter and my work computer's usb ports are conveniently placed. From what I have read, normal usb charging maxes out at 500ma, but can be increased if your usb port has more juice if you short the data wires, which will tell the phone to grab more power because it thinks it is plugged into an AC adapter.
I have found this adapter http://www.dealextreme.com/p/usb-data-charging-extension-cable-for-samsung-p1000-black-91141
it is meant for a galaxy tab, but From what I see is that it has a switch that either allows data / slow charge or allows quick charging. I have purchased a few of these already because I'm assuming it will still work with my galaxy s2.
I'll let everyone know how it goes, but does anybody see a problem with this or think I'm going to fry my phone for any reason?
Thanks.
Click to expand...
Click to collapse
Only the Galaxy Tablets have this limitation (they cannot be charged at all via computer usb only via their "special" wall adapter) so the adapter won't do anything for a phone. The adapter works on the tablet because what the adapter is doing is shorting 2 pins on the USB cable to fool the TABLET into thinking it is on the AC adapter "specially made" for it.
As long as you plug the phone it into a self-powered usb port (ie: a hub with a power brick) you will get max current the phone allows. The adapter will make no difference on the phone because the phone CAN charge off the PC port while the tablet cannot. It won't hurt the phone but it won't help it either.

MisterEdF said:
The adapter will make no difference on the phone because the phone CAN charge off the PC port while the tablet cannot. It won't hurt the phone but it won't help it either.
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Click to collapse
Thanks for the info on the galaxy tab, however I disagree with you in your opinion that an adapter that shorts the data wires will not help the phone to charge quicker.
It seems either the devices or android system itself limits charging to 500ma so it does not damage the computer, the phone itself knows that it is connected via usb, and will state "Charging: USB Plugged"
If you let the phone think it is connected to an AC adapter, it will allow the battery to accept whatever amperage you throw at it, and you will see that the system states "Charging: AC Plugged"
Obviously there are two modes of charging going on here.
See this thread:
see here:
http://forum.xda-developers.com/showthread.php?t=844284

Has anyone tried this yet?

I have found that using the Galaxy Tab chargers works the same way. They have a 2amp output vs the .5 amps that most blackberry chargers and USB use... It shortens the charge time significantly.
TMO SGS2, Darkside 3v8, Kernel Venom 3#5, UVLC8

Charger considerations
Hi,
I need advise for the following:
Charger A (Li-polymer battery) output : 5V, 1A
Charger B (Li-polymer battery) output : 5V, 500mA
Device input: 5V, 750mAH (Li-ion / Li-polymer)
When using Charger A, some people comment that it will limit the current of 750mAH for the device and the device's battery should be fine since both the charger and device are at 5V. However, some people comment that this will shorten the battery life of the device since it will perform a 'quick charge' using 1A.
When using Charger B, some people comment that the device will draw more current than it can deliver and causes it to heat up and reduces the charger's life. However, some people comment that Charger B will extend the battery life of the device since it performs a 'slow charge'.
I also read that USB pins on the charger denotes if the charger is a PC or a dedicated charger. If it is a PC, the device will limit the drawing current. If it is a dedicated charger, the device will draw more current to charge itself.
I am confused as to who is right and which charger should i be using.
Can someone enlighten me ?
Thank you very much.

Bought this external charger...friend says will hurt GN..please advise

i.Sound Portable Charger
Has 16,000 mah
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'
I charge a number of things on here...
A friend has me a bit confused saying this could damage the charging mechanisms of the phone.
Any input please?
Thanks

rockky said:
i.Sound Portable Charger
Has 16,000 mah
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'
I charge a number of things on here...
A friend has me a bit confused saying this could damage the charging mechanisms of the phone.
Any input please?
Thanks
Click to expand...
Click to collapse
Do u mean, you are giving the Galaxy Note an input of 5V, 2.1A (ie, output of Portable Charger)? if so, it is going to effect the battery life in long run..it may charge your phone faster, but definitely going to hurt the life of the battery..there are a lot of factors which should be considered like how much extra current you can give, temperature etc etc..

I don't think so: charging current is controlled by the device being charged, not the charger.
The Note will draw only ~700mA on an "AC" charger, even if that charger can supply up to 1A, 2A, etc.
On USB, it will draw ~500mA.
A mains/AC charger shorts the 2 data pins, which tells the phone that it's a dumb charger, not a USB host, and it is safe for the device to draw up to its own maximum (700mA for the Note).
---------- Post added at 12:23 AM ---------- Previous post was at 12:16 AM ----------
The corollary to that is that you shouldn't be able to shorten battery life by over-current charging: even with a 2A Nexus charger the Note draws only up to its maximum 700mA.
[I did just that test a moment ago to check: 725mA, on the 2A Nexus 7 charger]
Of course, 700mA is more than the 500mA it will draw from a USB host, so if you were really concerned, you could use that.
But the device ships with a mains/AC charger from which it will draw 700mA, so you're never going to exceed the "official" charger, whatever charging source you use.

cdmackay said:
I don't think so: charging current is controlled by the device being charged, not the charger.
The Note will draw only ~700mA on an "AC" charger, even if that charger can supply up to 1A, 2A, etc.
On USB, it will draw ~500mA.
A mains/AC charger shorts the 2 data pins, which tells the phone that it's a dumb charger, not a USB host, and it is safe for the device to draw up to its own maximum (700mA for the Note).
---------- Post added at 12:23 AM ---------- Previous post was at 12:16 AM ----------
The corollary to that is that you shouldn't be able to shorten battery life by over-current charging: even with a 2A Nexus charger the Note draws only up to its maximum 700mA.
[I did just that test a moment ago to check: 725mA, on the 2A Nexus 7 charger]
Of course, 700mA is more than the 500mA it will draw from a USB host, so if you were really concerned, you could use that.
But the device ships with a mains/AC charger from which it will draw 700mA, so you're never going to exceed the "official" charger, whatever charging source you use.
Click to expand...
Click to collapse
yes, though AFAIK the Note will draw more than 700mA from the OEM charger
and I have noticed charging speed differences by using different aftermarket chargers... never put a multimeter to them though

while charging the battery in the note is safe, I don't recommend plugging in your portable charger into a external battery charger. They may not protect the battery from overcurrent. Pay attention to all the specifications of all charging devices you use. Especially if you also have an aftermarket battery.
Cheers
Sent from my GT-N7000

guitarplayerone said:
yes, though AFAIK the Note will draw more than 700mA from the OEM charger
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Click to collapse
Are you sure? I didn't think that was the case; I could be wrong of course.
do you have any more details on that, please?
I have used many, many USB chargers: mains/AC, 12V, solar, portable battery, and never seen greater than ~700mA being drawn by the Note.
I'd like to know otherwise, for the odd occasion when i might want a really quick charge!

My friends point was that the i-sound charger would hurt not so much the battery but might damage the charging circuitry in the phone...course I learn this after buying this charger! ( I know its fine for nexus 7 and 10.1 tab).
Again its
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'

rockky said:
My friends point was that the i-sound charger would hurt not so much the battery but might charging circuitry in the phone...course Ilearn this after buying this charger! ( I know its fine for nexus 7 and 10.1 tab).
Again its
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'
Click to expand...
Click to collapse
Yup, and I believe the answer is no: you cannot damage the Note's charging circuit by using a charger that has a higher *maximum* current, since the Note will only draw a current of (approx) 700mA regardless of the charger's maximum.
As an example of that, my test showing that the Note still only draws 725mA when connect to the Nexus 7 charger, which has a maximum charging current of 2A.

Thanks

cdmackay said:
Yup, and I believe the answer is no: you cannot damage the Note's charging circuit by using a charger that has a higher *maximum* current, since the Note will only draw a current of (approx) 700mA regardless of the charger's maximum.
As an example of that, my test showing that the Note still only draws 725mA when connect to the Nexus 7 charger, which has a maximum charging current of 2A.
Click to expand...
Click to collapse
There was a mid on this site a really long time ago showing how shorting a specific connection in the usb cable will enable ac mode and this is supposedly what the oem charger does

guitarplayerone said:
There was a mid on this site a really long time ago showing how shorting a specific connection in the usb cable will enable ac mode and this is supposedly what the oem charger does
Click to expand...
Click to collapse
yup, that's right: shorting the two data pins --- which most "dumb-charger spec" capable chargers do --- tells the Note that it's OK to pull its maximum ~700mA. But it won't pull any more than that even if it's a 2A charger.
Without that short, the Note will only pull the regular ~500mA (again, regardless of charger max current): it thinks it is connected to a standard USB host, which might not be able to supply > 500mA, e.g. a laptop motherboard.
If you have a >500mA charger that *doesn't* follow the dumb-charger spec, i.e. it doesn't short the data pins, e.g. possibly a Mac USB charger, then you can get a charge-only no-data USB cable, that has the data pins shorted internally (in the cable itself), which will achieve the same effect. This is the mod you describe above.
You probably should not use that cable with a regular USB host (although the host will probably just limit its current anyway).
[Macs use some proprietary "signalling" method, whereby differing value resistors are placed across the data pins, telling the device differing levels of current to pull, etc. This is why you'll see external battery packs like Anker Astro 3 having a "Samsung port" and also a "iPad port"; madness]
Finally, some Android kernels have a hack that will allow AC mode (e.g. 700mA on the Note) regardless of the data pins. But this isn't always wise, and so many devs won't touch it. It prob wouldn't bother the Note, but it might not be good for the host/charger.
Apologies for rambling on, but people seem to ask this sort of thing a lot...

yep people wantblong battery life and fast charge.
About time a proper fuel cell is introduced
Sent from my GT-N7000 using Tapatalk 2

Most of this is over my head
So bottom line: charging my note with the i-Sound charger described in the OP will NOT damage my new Note , correct?
Tnx

rockky said:
Most of this is over my head
So bottom line: charging my note with the i-Sound charger described in the OP will NOT damage my new Note , correct?
Tnx
Click to expand...
Click to collapse
I believe that's correct; I would not hesitate to use it.
As someone else stated, however: whilst charging in the phone should be safe, since the phone controls the current, taking the battery out and charging it in a standalone battery charger may not be safe.

rockky said:
Most of this is over my head
So bottom line: charging my note with the i-Sound charger described in the OP will NOT damage my new Note , correct?
Tnx
Click to expand...
Click to collapse
Yes, that's correct. Generally, just make sure the voltage is not too high (or too low). The range of 4.7V to 5V should be OK, since there is some allowance for variations. The current ( ie, the Amperes) only indicates the current the charger is capable of supplying. It doesn't mean the charger will force all that current down the battery's throat. The device/battery will draw as much as it needs, and this will not damage the device or battery whether it's 0.5A or 2A.

Charge 2 SGSIII's at once?

I would like to get a charging cable that has 2 Male Micro USB connectors and 1 standard Male USB connector.
These are supposed to charge 2 cell phones through one USB charger, but I've read that you might need a higher capacity charger than comes with your single cable charger.
Will the standard USB charger that comes with our phone work, or will I need a higher capacity charger?
Thanks

OKAstro said:
I would like to get a charging cable that has 2 Male Micro USB connectors and 1 standard Male USB connector.
These are supposed to charge 2 cell phones through one USB charger, but I've read that you might need a higher capacity charger than comes with your single cable charger.
Will the standard USB charger that comes with our phone work, or will I need a higher capacity charger?
Thanks
Click to expand...
Click to collapse
Our S3's can charge at approximately max 1.1amps and perhaps more on a custom rom. Our stock chargers will not likely provide enough to charge 2 S3's at that fast rate. But, instead it will likely charge both at half that rate. So. I would get a charger that can handle more than 2amps...preferably 3amps so that there is plenty of headroom especially if the charger specs are over-rated. The S3 will only use what it needs and of course, it will slow down the charge as it gets closer to being fully charged. Also, note that if the USB Y-cable or splitter is not wired correctly, then it may not charge at fast rate.

themadproducer said:
Our S3's can charge at approximately max 1.1amps and perhaps more on a custom rom. Our stock chargers will not likely provide enough to charge 2 S3's at that fast rate. But, instead it will likely charge both at half that rate. So. I would get a charger that can handle more than 2amps...preferably 3amps so that there is plenty of headroom especially if the charger specs are over-rated. The S3 will only use what it needs and of course, it will slow down the charge as it gets closer to being fully charged. Also, note that if the USB Y-cable or splitter is not wired correctly, then it may not charge at fast rate.
Click to expand...
Click to collapse
Thanks. Where can I find a 3 amp charger?

OKAstro said:
Thanks. Where can I find a 3 amp charger?
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Click to collapse
I have a usb 2amp cigarette lighter charger and it has 2 usb ports for charging and charges my S3 and an HD2 together at fast rate when I use proper usb cable(s).
On a 2sec Google search, I found this 3amp usb wall charger (2amp + 1amp) example...or this Scosche 4 port 4amp wall charger although it says each port is limited to 1amp max. You can always put in a USB Y cable making 2 ports merge into 1 yielding 2amp max output...if necessary.
Here is a 2 port x 2.1amp per port example..which would give you maximum headroom and might work well for more demanding tablet devices etc.

USB Charging Slow

Can someone tell me why is it that when i charge my phone when USB connected to PC its takes hours together to charge and Wall Charger takes 1/4th of that time why is that can anybody tell me what is the login behind it and which is best way to charge ?

USB only outputs 5v, which is why it takes makes longer. You have more power outputted from the ac adapter therefore it charges quicker. Simple as that. They will both eventually charge the device, but it's recommended you use the wall charger all it's faster, no one likes to wait

+1
U cannot compare usb charging with ur charger as output voltage varies across both n btw usb is jst an alternative for charger it's not a replacement
Sent from my LT22i using Tapatalk 2

You can use a custom kernel and change charging current.
Sent from my GT-N7100

Ok thanks Guys to know what is the main difference

Technically, voltage has little to do with charging. The amperage is what counts. USB on a computer gives ~500 milliamp, where ac chargers give 1-2 amps
Sent from my SGH-I997 using xda app-developers app

For a more detailed answer...
All compatible chargers output the same voltage, 5 volts. (Otherwise they just would burn out the charging circuits in the phone. It can happen both if there's too much volts and if there's too little, but for very different reasons.) However, voltage is not the only characteristic of electricity, the other most important is current, that is, amperes. Think of volts as 'water pressure' and amperes as 'amount of water pumped per minute' through a water pipe -- with real water, those are connected, with electricity they're quite separate.
Every source of stabilized electricity you will find in any kind of power supply will have a set voltage it outputs electricity at, and maximum current it can output. Trying to draw more current than it can supply can damage the power supply, so your phone limits the current it attempts to draw when it detects a standard USB port -- to what the USB standard says it should be able to safely supply. For standard ports, it's 500mA. Galaxy Note II by default plays it safe and draws 425mA. The stock AC charger is rated at 2000mA, and Note draws 1700mA when it detects one. This specifically affects the speed of charging -- AC chargers will charge battery faster, because three times more power gets in.
The USB standard was written before everyone and their mother started using it as a charger, and today, USB ports can usually handle more than 425mA, and on some computers they can supply just as much power as the stock AC charger. There are a few standard ways to detect how much current can a phone safely draw from an USB socket, but not all of them are universally accepted or correctly implemented, so the phone always plays it safe when it can't be sure. If you install a custom kernel, you can directly tell it how much power to draw if you know your USB port can handle it.

:good: :good::good::good::good::good:

aukhan said:
:good: :good::good::good::good::good:
Click to expand...
Click to collapse
You can use the app Galaxy Charging Current (GCC) from the S3 thread which can measure the output of the incoming current. It will also allow you to detect faulty cables and chargers, as you will be able to see different ratings with different cables and chargers.
Testing on typical USB ports will get you a reading of 460, while the original charger and a good cable will give you 1800 (about the max current draw for the Note 2).
If you use a known good charger and get a lousy reading, it indicates a bad cable. I once had a cable give a readout of 100. I promptly threw it away.

Yes i am using that thanks nyways

[Q] Optimal charging hardware for Note III

So the note III is the first smart phone to use USB 3.0 this raises some interesting questions. First of all I’m a neophyte with electrical “stuff (to use the technical term) so I apologize if some of this is easily answered (which would be great).
1. Since USB 3.0 can draw 5 Voltsdoes this mean that the current crop of car chargers won’t charge the Note III at full speed. All the car chargers I’ve seen are 2.1 Amps (some are dual port and claim 4.2 but that’s total, not in a single port). Does this mean that we’re locked to slower charging in the car?
2. For those of us with built in DC/AC inverters, would we be better served by using that plug and a wall USB charger? If so which one, my Note III will be shipping soon, so I’m assuming that 1000mA is still the maximum (I think USB 3.0 supports 900mA).
3. Will the note III charge slower using a USB 2.0 cable even with the best inverter/car adapter
4. Do we need a “charge only” cable (like http://www.amazon.com/Specialised-Micro-USB-Cable-Charging/dp/B0088HTYUE ) to achieve the best charging speed ?
5. In the event we can't get an optimal charger will the note III charge faster with a 2.0 charge only cable vs a standard USB 2.0 (I assume so but better to ask).

The move to USB 3.0 only affects charge rates connected to a PC. 2.x is limited to 500mA while 3.x is 900mA I think. Both standards use 5V, but 2A AC chargers often run a bit higher at 5.3V. The chargers don't directly adhere to either USB spec and basically trigger fast charge the same as before, by shorting out or putting a fixed resistance between the data pins. My old HP TouchPad USB 5.3V/2A charger with 2.0 cord charges my Note 3 just as fast as the Samsung 5.3V/2A adapter with USB 3.0 cord does. If you look closely, you'll notice that the "USB 3.0" Samsung charger doesn't actually have the extra 3.0 pins, it uses a 2.0 port. That's because for pure charging devices the standard doesn't matter, only the current and voltage rating and that it shorts the data pins.
Sent from my SM-N900T using xda app-developers app

CalcProgrammer1 said:
The move to USB 3.0 only affects charge rates connected to a PC. 2.x is limited to 500mA while 3.x is 900mA I think. Both standards use 5V, but 2A AC chargers often run a bit higher at 5.3V. The chargers don't directly adhere to either USB spec and basically trigger fast charge the same as before, by shorting out or putting a fixed resistance between the data pins. My old HP TouchPad USB 5.3V/2A charger with 2.0 cord charges my Note 3 just as fast as the Samsung 5.3V/2A adapter with USB 3.0 cord does. If you look closely, you'll notice that the "USB 3.0" Samsung charger doesn't actually have the extra 3.0 pins, it uses a 2.0 port. That's because for pure charging devices the standard doesn't matter, only the current and voltage rating and that it shorts the data pins.
Sent from my SM-N900T using xda app-developers app
Click to expand...
Click to collapse
Thanks for the response.
So I should use a "charge only" cable, correct?

bladehawk said:
Thanks for the response.
So I should use a "charge only" cable, correct?
Click to expand...
Click to collapse
If you want maximum charging out of a PC, yeah, otherwise it really doesn't matter. Also, if you use a fast charge kernel with fast charge enabled, it does the same thing by forcing the charger detection in software rather than in hardware. That said, you're still at the mercy of your USB port. USB 2.0 ports on PC's are only rated for 500mA usually and while you can overdraw from most without issue, you run the risk of overloading and at least triggering a software shutdown of the port (at worst, burning up the motherboard's power regulator for the USB 5V rail).
If you're plugging a cable into an AC adapter, it literally means nothing. All a "charge only" cable is is a USB A to micro B cable with the two data pins on the micro B side shorted together. Only the GND and +5V lines are wired through to the USB A connector which makes it only draw power, not data, and the shorting of the data pins makes it detect as an AC charger. Since the AC adapters short the data pins already, both cables look the same on the phone end when connected to an AC adapter. Same goes for a car adapter or external battery pack.
Technically, USB 2.0 and earlier, maybe 3.0 as well, are only supposed to let you draw 100mA. Devices must enumerate themselves to the controller and request the power limit be increased to 500mA. Many motherboards are pretty lenient about this so you can usually get away with plugging in a 500mA (or higher) load without telling the PC first but be aware it's breaking the specification and could be unsupported.

Some PC/laptop are BC 1.1 compatible. Meaning they can charge higher than the 450ma they usually do. I think it allows for up to 1.5a charging but don't quote me on that I forgot. I have a USB 2.0 hub that can use a wall charger and allows one device on any of the 4 ports (automatic sensing) to charge higher than usb2.0 specs. There are some hubs that allow all ports to do this. I am waiting for plufable technologies to update their 3.0 hub to do this.
sent from my sm-9005.

It is the normal case that the speed will be much slower when you charge a device such as your Note3 via USB than via DC Power Supply. USB is mainly designed for the communication. The standard charging current of many mobile phones is 1 A or higher. But the highest output current of USB cable is only 0.5 A which could not reach the source demand of a phone. Except for this, we do not recommend charging via USB because the unstable current output can easily reduce the battery life of your Note 3.

Handlewd said:
Except for this, we do not recommend charging via USB because the unstable current output can easily reduce the battery life of your Note 3.
Click to expand...
Click to collapse
Now that's something I never thought about. I would always plug my old phone into my computer when I got to work just to keep it topped off. Though lately, I'm plugging into a powered Belkin hub, so hopefully the current is more stable.
Now that I've got a new phone, I may rethink my charging strategy.