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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.
Click to expand...
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.
I picked up one of these chargers:
http://www.macally.com/EN/Product/ArticleShow.asp?ArticleID=326
which, in principle, should charge the Tab. It does charge it but it also does some strange things while plugged in:
1. Starts MTP USB mode
2. Completely messes up digitizer - I've installed TouchScreenTune and in the test area I can see when I touch, sometimes the perceived touch seems to rapidly cross the entire vertical area and in regular use it will activate the status bar when I touch anywhere.
I exchanged it for this one:
http://www.macally.com/EN/Product/ipod4show.asp?ArticleID=391
It doesn't have as high a wattage output but still higher than a standard USB charger so should charge faster.
I still get:
1. MTP USB mode
2. not quite as messed up digitizer - seems to be okay in normal use but when I test it in TouchScreenTune I can see that the perceived touch is very jittery. It's now jittery only to a small amount of error so it's usable, but something is going on.
I've also found the tablet completely non-responsive to touch a couple of times today (not plugged in) and eventually it comes back but behaves very slowly until I reboot. I don't know if this has anything to do with the charger or just a coincidence.
I'm concerned with the behaviour of the digitizer that these chargers are doing something bad to my tablet. These behaviours don't occur when I use the official charger. I was hoping to get something with multiple charging ports so I have less to carry and plug in when I travel.
Should I be concerned about use this charger? If so, other than the official Samsung charger, does anyone know of a compatible multi-port charger?
Thanks!
You might be looking at different effects caused by different things.
1) There are two different kinds of USB cables for the Galaxy Tab 10.1: a data cable and a charger cable. These are slightly different. Using a data cable will still allow the Tab to charge, but probably slower. But this can cause the MTP USB mode to kick in (but this also depends on the charger)
2) Some chargers go way above the normal 5 Volt. With most devices that is not a very big problem. But capacitive touch screens are very sensitive to that. That's most probably what you notive. I see the same if I use some cheaper chargers.
3) I don't think your touch screen is damaged by the use of these chargers. If that would be the case, it would probably malfunction all of the time and not occasionally. Chances are a lot higher that you installed some new software or widget that is behaving badly.
USB chargers designed for apple devices in principle will not supply more then 0.5A to non-apple devices.
Apple uses a special technique to signal to the USB charger to supply more power, while non-apple devices uses a different technique. And unfortunately all the charger manufacturers only seem to consider Apple.
So all those chargers proclaiming 2.1A that you can find on Amazon or eBay are all designed for Apple devices. And don't believe when it says on Amazon or eBay that Android devices are supported. Read the reviews and you will typically find someone with charging problems with a non-apple device.
USB chargers are basically all the same except for the amperage that they put out. The stock GTab will not charge very well unless the amperage is around 2A. If you root, you can install a tweak that allows the device to charge with any amperage but with the typical .5A charger it will take a lot longer than with a 2A version.
I use the charging pucks for my iPhone and my wife's iPad interchangeably for those devices and my GTab. They all work fine. The iPad puck puts out about 2A and is about the same as the one that ships with the GTab. Since the GTab version is on my desk, I also use it to charge a bunch of other USB devices such as my hands free car speaker and some wireless headphones. I just plug the appropriate cable into the puck. I have not experienced any problems and suspect that I could use my wife's iPad puck the same way. (I have not yet tried this).
I just ordered a couple dual 2A USB car chargers that allow two USB cables to be plugged in, each getting 2.1A. From what I have been able to discover, these devices will charge just about anything as long as the charging cable has a standard USB connector. They come from China on eBay for less than $3 ea.
I will follow up this post with a review when they arrive.
Bob
USB chargers are not all the same.
"Modern" Adapters that implement the USB Battery Charging Spec, short the middle two data wires (D- and D+), the device can use that to detect that it can draw up to 1.5A (instead of the 0.5A that you get from a regular port).
Apple instead using a different (non-standard) scheme where they communicate to the power supply using voltages, and where different voltages represent different Amperage (I don't know the exact details).
So power supplies sold for Apple devices, as far as I have seen, do not short the data wires and as such a non-Apple device will not draw more then 0.5A
*edit*
Just to add to this, because apple devices communicates with the charger over the two data wires using voltages, while devices that implement the USB Battery Charging Spec require the data lines to be shorted, the two implementations are incompatible.
What you could probably do, is crack open a 2A apple compatible charger and just short the D- and D+ and have a charger that will charge non-apple devices up to 1.5A. And it should also be possible to put a switch on the charger to switch between Standard and Apple charging mode. But if you mess up, don't come and complain to me!
Here is a nice video on how the apple charging works for the iPhone on youtube. But unfortunately this crap forum software won't allow me to post outside links.
Just do a google search for "reverse engineering apple charger"
I made some usb adapters that plug between any usb port and galaxy tab 7.0 plus usb
I made some usb adapters that plug between any usb port and your samsung galaxy tab 7.0 plus usb connector that allows charging from any usb port. I think it's the same for any galaxy tablet/phone. This way you can charge from any pc, or generic wall charger, any car charger, etc. If you're interested in one let me know. I can list them on ebay or some other site.
See pictures, nothing fancy but they work perfect with any charger and or usb port
Pic 1 is adapter
Pic 2 is adapter plugged into portable 12000mAh battery charger made for apple products
Pic 3 I added another adapter I made in between to measure amperage
Pic 4 is screen shot showing "AC" not "USB" and little batter icon without RED "X"
My phone charges just fine when connected to a computer, but it will not charge, at all, from an AC plug. I've tried the official adapter, adapters which came with other devices, other cables... and there is no way the phone would charge from any AC plug. Other devices charge perfectly fine using the same adapters.
Is that something which I can troubleshoot myself, or I need to take it to some official tech service?
juanml82 said:
My phone charges just fine when connected to a computer, but it will not charge, at all, from an AC plug. I've tried the official adapter, adapters which came with other devices, other cables... and there is no way the phone would charge from any AC plug. Other devices charge perfectly fine using the same adapters.
Is that something which I can troubleshoot myself, or I need to take it to some official tech service?
Click to expand...
Click to collapse
I would say that the AC adapter is shot but if it's charging other things, it's not.
Try removing the battery for 2 minutes, put it back in, plug up the phone, then turn it on.
Thanks, but it didn't work
Hi Guys,
I'm just wondering if my unit is defective or it's really the case for Galaxy Note 8's. My tablet charges just fine when using the wall charger, but when I connect it to my PC, it won't charge at all. I've tried different cables that I use for my phone and other gadgets, but none of them will work.
Is there a way for me to make it charge via USB?
Grawrz said:
Hi Guys,
I'm just wondering if my unit is defective or it's really the case for Galaxy Note 8's. My tablet charges just fine when using the wall charger, but when I connect it to my PC, it won't charge at all. I've tried different cables that I use for my phone and other gadgets, but none of them will work.
Is there a way for me to make it charge via USB?
Click to expand...
Click to collapse
Mine also says not charging when its plugged to the PC, its because the USB ports supposedly don't give enought current to charge the tablet, but i once left it connected overnight while transfering my MP3 collection and in the morning the tablet was 100% charged, so i think even if it says is not charging, it charges but ultra slow, even slower than a cell phone.
USB ports on a PC does not put out enough voltage to charge the tab. Like said above, if it does, it will take forever. Look on the back of your wall charger. It should say 10v. USB ports typically put out only 5v. If you look on the back of a phone charger, it should be 5v.
Sent from my GT-N5110 using Tapatalk
cavsoldier19d said:
USB ports on a PC does not put out enough voltage to charge the tab. Like said above, if it does, it will take forever. Look on the back of your wall charger. It should say 10v. USB ports typically put out only 5v. If you look on the back of a phone charger, it should be 5v.
Sent from my GT-N5110 using Tapatalk
Click to expand...
Click to collapse
It's not the volts, it's the amps. Your charger provides 2A. A typical USB port provides 0.5A. But in any case, you'll not be able to charge this device from a computer USB port. It's not a fault in the device.
That explains it then. Thanks guys :laugh:
Hmmm... I alway charge my note 8.0 thru my pc usb.
It charges on my pc and lap top.
If you want to be sure just let is sit for an hour and see if the % went up.
Doesnt charge fast but charges in an evening from 60 to 100%
Perhaps it doesn't charge while the screen is on, because the power drain exceeds the charge rate? There would be no way to see it change to "charging" because the screen must be off for that to happen... Just some speculation
Sent from my SPH-L710 using Tapatalk
I have a HP Envy M6 laptop that I use to charge my Note 8. It only charges on the port closest to the battery. The only USB 2.0 port out of 3 other USB 3.0 ports which is odd because they say USB 3.0 ports give out more power.
I have tried charging it with another HP laptop that has the same USB setup but it doesnt charge in any one of the ports, 2.0 or 3.0.
I guess it just depends on the PC you're charging it with.
Can charge.
hi,
We can charge note 8, if the note is switched off and connected to a PCvia USB
Normally Note 8.0 can not charge with pc usb port or car usb port because AC current of them too low only 0.5A (minimum AC current of charging require should be 1A)
Samsung Tablet stock charger is 2.1A (Note 8.0 device allows 1.8A)
My Samsung GalaxyS3 will only charge via Laptop usb port, If I plug in the wall charger it dis-charges instead of charging.
I googled the problem and it seems to be unique to the S3, but did not find and reason or solution for the problem.
anyone have any idea why this has happened and what can be done to resolve the problem.
there was one suggestion that the usb plug might have dust and is not making a clean connection but that makes no sense
Have you tried different USB cables and chargers?
I had the same issue when I recently went on holiday. I took with me a non-Samsung wall charger with four USB sockets, and some oddball USB cables to charge all my devices.
My S3 was not charging over night. I discovered that the non-Samsung wall charger and the thin USB cable were not providing enough current to charge my phone.
As an experiment, I installed Ampere from Playstore on another Android phone, (it would not work on my S3), and I used it to test all 11 of my wall chargers and 5 cables and I was surprised to find some wall chargers would supply 780mA, while others only 380mA. Similarly, some USB cables would only pass 440mA where as a thicker one would pass 780mA.
The moral of the story is that the Samsung S3 is quite fussy on which wall chargers and cables it will charge from.
The best suggestion is to get a Samsung wall charger for a tablet, and the thickest USB cable you can find.
thank you