yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab 2 General] The_Omen:
Thanks! Works on the 3113. It's shows charging and doesn't show as media device on the laptop. Nice find.
[Galaxy Tab 2 General] Tinderbox (UK):
Hi.

I have a couple of these usb adaptors, see link below, I bought them years ago for the original 7" galaxy tab but i never used them.

If i plug my tab2 into an usb2 port i get the red cross on the battery icon, so i tried one of these adaptor and my tab2 is charging from an usb2.0 port on my notebook and according to battery monitor widget pro at 14% an hour, and i have a lightning bolt sign in the green battery icon.

I did a search for the adaptor i bought and i think i have found it for £6.50 each, see link below.

http://www.mytrendyphone.co.uk/shop/samsung-p1000-galaxy-63928p.html

John.
[Galaxy Tab 2 General] necktru:
the tablet charges anyway so the icon says no

In 4.0.4 rom the charge icon its fixed, anyway charge by USB is too, too slow, only use for emergency
[Galaxy Tab 2 General] mad5870:
not trying to be a smartass but i know when my tab goes from 5% to a 100% while plugged in to my computer its charging. and yes still had the x.
[Galaxy Tab 2 General] haythams:
Mine P 3100 international version even x on battery while usb connected but still its slowly charging this occurred aso to tab 1 and tab 10.1 SII and note
[Galaxy Tab 2 General] coolypf:
it charges while connected to desktop, not while connected to laptop
[Galaxy Tab 2 General] Droidlover123:
no it charges with laptop too
[Galaxy Tab 2 General] pbanj:
mine charges while connected to usb, it didnt when it was stock though
[Galaxy Tab 2 General] Sean_Seany:
Im running 4.0.4 , but when i was running 4.0.3 you could " half insert " the usb connection and it would show as charging.

Anyway it doesn't seem to work now on 4.0.4 and to be honest its a pretty slow way of charging up your tab .

*PRO TIP*

Charge by the mains supply as its much faster . When in bed i use an EXTENSION lead so im all comfortable . Same as being plugging into my laptop but the benefit is ....a faster charge and i'm not depleting my laptops charge. :cowboy:
[Galaxy Tab 2 General] mab71:
It DOES charge even with the x on the battery.... but slower than the wall charger

Sent from my GT-P5100
[Galaxy Tab 2 General] moliverac8:
I can charged it with cyanogenmod
[Galaxy Tab 2 General] thedeamon:
Confirmed working without device rooting on P3100..thx for the share. Insert the USB end to PC/Laptop USB port half-way ( not full ). Works fine.
[Galaxy Tab 2 General] EmeryDR27:
Hello everybody this is my first post :) Just to let you know that when my tab was completely switched off and I plugged it into my laptop the usual battery display came up and started to charge as normal! Was surprised myself as I know it is only ment to charge via the provided adaptor. Also I noticed in Windows 7 when the tab is switched off Windows tried and failed to install some kind of driver that does not usually appear when the tab is switched on. I have Cyanogen 9 on my tab 2 10.1 so I don't know if this charging processes worked on stock installation but I think it has nothing to do with Cyanogen because the tab is switched off and no OS is in action. Any ideas as to why this occurs I do not know but I have remained using the adaptor before someone states that it is consistent method for charging. As with some devices charging via USB can be slow, is there a huge benefit to charge the tab via USB while switched off? Thank you ppl for reading :)
[Galaxy Tab 2 General] rankman2004:
:( can not work for my P3110
[Galaxy Tab 2 General] SayaX:
Just wanted to point out that although my 7.0 charges through USB, if you do the same through a desk dock, the tablet will lose charge. It seems to happen only when the screen stays on for me since I am a desk dock app and it's not charging fast enough to make up for the battery drain...

Just FYI
[Galaxy Tab 2 General] thekwijibo:
It would be nice to see some .APK or .ZIP that would allow USB charging. I've notice in using CM9 that USB charging works just fine.
[Galaxy Tab 2 General] sg+:
hmmm...

what are we talking about?

Fact: USB at PC/Notebook only have 500mA, external Charge-Adapter can also do 1-2A(current), so charging goes faster!!!

Simple Test: switch Off your Tab and connect it to USB(PC) it will charge full over Night.

If u want charge faster, use Original-Charge-Adapter.

there is no influence of the firmware, only the current of your USB Adapter !!!

SG+
[Galaxy Tab 2 General] Mohamedselim:
In glaxy s2 forums if we use sayih kernel and via Extweaks app which we download from google play we could draw more current from usb but somewhat dangerous in usb ports as stated by extweaks app lets hope oneday a kernel like this comes to our tabs

Also from general knowledge in pc usb3 could give more current to devices that are compatible with it more than usb2 and usb1 lets hope someone could figure out it
[Galaxy Tab 2 General] i0nsn0w:
For me it charges normally on the pc. I've got a usb 3.0 high power controller, maybe this is relevant because it gives 1A to the tab and not just 500mA.

sn0w
[Galaxy Tab 2 General] Mohamedselim:
I think also that turning off the display while charging via usb might help to decrease the time for full charging as no power is drawn by screen so most power drawn by usb go to battery

Mohamed Selim
[Galaxy Tab 2 General] savagehax:
Usb charging is extra slow anyway use charger
[Galaxy Tab 2 General] thekwijibo:
Simply saying that USB charging is slow, and dismissing the matter is sidestepping the point, and is not an acceptable response. The point is, that while using a ROM like CM9, one can charge the tablet by plugging the USB into a computer. Period. The stock ROM, as well as several others based around the stock ROM, all have issues charging directly from a USB plugged into a computer. (It will show the battery icon with a red "X" through it, indicating that it is not charging) One way of getting around this is by finding that "sweet spot" of the USB plug inserted half-way to enable charging. This is one solution, but it is pretty ghetto and doesn't allow file transfers while charging.

I keep my wall charger at home. While at work, I like to have my tablet handy, and sometimes the battery gets low. Having a tablet with "enabled USB charging" would eliminate the need for me to travel around with my wall charger. I don't care if USB charging is slow, as long as it IS charging.
[Galaxy Tab 2 General] Sean_Seany:
This .... +1

If your can afford the tab I'm sure you can afford a spare charger for work . You can pick Samsung ones for as little as £5.00....5 whole british pounds lol :p
[Galaxy Tab 2 General] thekwijibo:
Once again... sidestepping the issue. Instead of helping identify the root cause, telling me what I need to buy. Fail.

I don't care if charging goes faster via wall charger.

Fact: Charging via USB "can" work due to a change/influence in software/firmware

In my application, having a docked tablet connected to media storage is useful for me, and it helps not having the battery drain during that process

I'm not interested in any useless suggestions of just buying a docking station, or buying an AC power charger. Why buy something else, when what you currently have can work for the application you need?

What I AM interested in, is if anyone knows how CM9 varies with other ROMs, and how to "flip the internal switch" to enable USB charging. Seeing that this is a software issue, it seems that a modification like this shouldn't be overly difficult. Based upon the whining and sidestepping, it almost seems like it is outside the realm of a simple modification or flashable package. I've never got my hands dirty in cooking a ROM, so I don't know how difficult this task would be, or if CyanogenMod did something fancy to make the Galaxy behave this way. Or is it something simple like the use of a specific kernel?
[Galaxy Tab 2 General] Sean_Seany:
I'm not the one whining , that would be you.

IF ..... You had a Galaxy Tab 10.1 with Pershoot’s overclocking kernel or a custom ROM with Pershoot’s overclocking kernel.

You could install a Terminal Emulator app off the Market.

Type “su”.

Then type, “echo 1 > /sys/class/power_supply/battery/force_usb_charging”.

You are sort of right about the kernel, so maybe try a few out n see if the Droid gods will show your favour n good will lol.

But my point still stands about using a wall charger via a USB connection. I take it you have sockets close to your workstation ?

Good luck with that anyway

:)

Source
[Galaxy Tab 2 General] thekwijibo:
Fair enough

Nice! This will be a good starting point. I'll have to look into this. Thanks!

*edit*

I do have outlets far away from my work station whereas I would either need to locate an extension cord, or go creeping under my desk to fish out my Galaxy Tab if I were to charge via outlet. (or locate a 6' USB cable) Since I have 6 available USB ports within reach, charging via USB makes a whole lot more sense with the additional benefit of being able to access the media storage.
[Galaxy Tab 2 General] Sean_Seany:
http://rootzwiki.com/topic/25618-kernelg-tab2-7-gt-p3113add-aospcm-support-053112/

Just noticed that this Kernel has USB fast charging added to it. Not sure what ROM you are using but may be something to look into.

Hopefully the terminal commands will work out.
[Galaxy Tab 2 General] thekwijibo:
Looks interesting. Too bad the data won't work while fast charging. Or perhaps it might charge w/o the rapid charge command.... Might have to play around with this one. I'm currently running Tab2Lite RC1 after running mostly CM9 for a few weeks. So far I enjoy having the IR blaster, and the bluetooth seems to work better with this ROM.
[Galaxy Tab 2 General] nyc2rdu:
Very cool trick, double so because it saved me cash. The USB cord cost $10 and a full second charger setup more than double that.
[Galaxy Tab 2 General] KrisPerry:
Is it fast ac charge or USB charge mode
[Galaxy Tab 2 General] bark777:
It is the USB port that determines the charge rate available. The trick only changes the icon that is displayed on the tab.

http://www.extremetech.com/computin...ks-or-how-to-avoid-blowing-up-your-smartphone

You can check this by making a cable that will allow for measuring the Milli amperes drawn by the tab.
[Galaxy Tab 2 General] KrisPerry:
In other tabs such as the nexus 7 there are two distinct charging modes: USB (slow) charge and AC (fast) charge.

It is possible to change between these modes by shorting the data pins together.is this possible with this tablet
[Galaxy Tab 2 General] bark777:
It's my opinion that shorting the two pins together will not do anything for you as the tablet already tries to get as much current as possible for a given charger port. But I may be wrong and you will have to do some testing for yourself. Since the tab shows not charging when connected to a USB port (But it really is charging just slowly ~

<

500 milliampers) shorting the pins might make the tablet show it is charging but at the same 500 milliampere rate, as that is the limit of the port. So it is good to short the pins for a phone; doing this for a tablet will most likely not cause the tablet to charge at a higher rate.

I have a Iphone car charger that is rated at 1amp, but my samsung phone shows USB. When I short the pins it shows AC and does charge near the 1amp rating of the charger. When I plug my tablet in the same chager it draws 1amp without the pins shorted and shows AC charging.

This thread will go a long way to helping you out.

http://xdaforums.com/showthread.php?t=1384253

And that's all I have to say about That.
[Galaxy Tab 2 General] Frrrrrrunkis:
Just want to say that my gtab 2 7.0 charges via usb. It shows a red X over the battery icon, but for ****zengigglez I left it pk igged in and low and behold the charge wnt from 15% to 84% in about an hour or so.
[Galaxy Tab 2 General] KrisPerry:
What is the reason behind the red x disappearing when the usb plug is half out. Is it related to the Data pins
[Galaxy Tab 2 General] rlopezcomputers:
Plus one. I just thought it happen to every galaxy tab
[Galaxy Tab 2 General] mrbkkt1:
Same as my tab2. red x, but charges.... Slower.
[Galaxy Tab 2 General] netlagger:
I have been reading through this thread and have noticed that a lot of people use their pc to charge their phone or tab. I have done my test with both usb and wall chargers. I have found that with the usb charge, my battery does not last as long as it does with the ac charge. You are actually hurting your battery with charging it through the usb. I just thought I'd give you all my opinion on this subject.
[Galaxy Tab 2 General] bark777:
Spend some time reading about li-ion cells. If they are charged at slower rate they tend to have a longer life span. (of course it will take longer to charge them) Try this link

http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
[Galaxy Tab 2 General] tweak89:
As other have said, it WILL charge. No need to trick it by futzing with the cable. It's just SLOOOOOOOOWWWW!!! I'd charge my Transformer this way too whenever I would manage to leave behind my charger when traveling. My generic USB chargers would also work, it would take overnight, but it would do it.
[Galaxy Tab 2 General] hilton24:
bro i think you right .....even i have noticed it ...the battery life sucks when charged with usb

---------- Post added at 10:26 PM ---------- Previous post was at 10:18 PM ----------

agree wid the theory bt not practically...sorry just my opinion
[Galaxy Tab 2 General] gokosan:
guys even with x on the battery it's still charging but very slow like the ipad it's the same.
[Galaxy Tab 2 General] HAYDENB:
When i plug mine in it still charges very slowly of course.
[Galaxy Tab 2 General] robteam:
Same here. I think it this tab requires a higher ampere comparable to a regualr tab charger which a usb cant produce
[Galaxy Tab 2 General] AZHARSSOFT:
Either of one only working, Charging or device access

If i follow ur steps, tab was charging thats good. But i was not able to access the device. So is there any other way where i can access both @ same point.
[Galaxy Tab 2 General] Droidlover123:
Sry no way to do that....
[Galaxy Tab 2 General] kymanhalim:
should be no problem with the charging
[Galaxy Tab 2 General] bandi.mculu:
Thank you. worked. i was baffled for weeks. Galaxy Tab 2 10.1 P5100.
[Galaxy Tab 2 General] oldbrand7:
i can say that on my p3110 4.0.3 itv stock the half-plug trick works (in charge (AC)), on 2nd ota (LI1) 4.0.4 itv it doesn't. i can hear a sound at halp plug but noting happens.

anyway... the tab actually charges with the correct plug, even if tells not in charge. with both roms i don't want to try the first ota lh3 i think it's the same with all 4.0.4

yesterday i charged my gs3 with p3110 adaptor (2A). from 15% to 95% in few less than 2 hours. today i'll try with gs3 adaptor (1A) but sure it's not double time..
[Galaxy Tab 2 General] moulee2009:
Slightly off topic nut what is best for the battery ? USB trickle charge or AC quick charge ?
[Galaxy Tab 2 General] Droidlover123:
Obviously AC charge
[Galaxy Tab 2 General] moulee2009:
I always thougt the slower you charge batteries the longer they keep their health ? So in months/years time the battery would be in better condition.
[Galaxy Tab 2 General] nz_:
do not do this.

False.

The less the current you use to charge it, the less heat it will generate while charging. Less heat means longer life span. I'm not talking about single charge capacity here. It's the durability of the battery that you gain charging it slowly.

Now, about the USB charging trick from OP -

I would not do that - there are a few reasons to it:

1. It still charges (slowly) even if it says it's not charging.

2. USB 1 & 2 are rated to 500mA per USB standards. That means that internal circuitry/components of your computer/laptop is sized to allow up to 500mA of juice through that connector.

IF you fool your tab by pulling the plug halfway, it will think it's connected to a wall charger and will pull more current. Now since components in your computer might be sized to only allow 500ish mA, you put them to stress by making them supply higher current. Should I mention that this can cause them to fail if you do this often, possibly introducing even fire hazard.

Now some USBs might have over current protection, some might not (cost savings, anyone ?)

If you own a computer with over current protection for the USB circuitry, you are still pulling your maximum 500mA and the tab still chargers slowly - just without the "not charging" icon.

Now, if you don't own a computer with over current protection, your tab will pull more current, with a risk of frying your USB port.

Now let's look what would be athird possibility - that USB ports of your computer are over-engineered to safely allow more than 500mA, but that would come at a cost. (i.e. even @ $0.01 per computer x the production quantities = huge costs to producer for nothing really). Makes sense ?

Your choice.

btw, the explanation for the charging trick from OP - If you take a look @ this picture of USB connector, you will notice D+ and D- connections are a bit offset towards the inside of the connector. If you don't plug the connector 100%, you are not connecting the D+ and D- contacts with your cable, fooling your tablet into thinking it's a dummy wall charger.
[Galaxy Tab 2 General] techiepiano:
This seems a little dated but...

I found this Youtube video today, which shows a cable that allows charging regardless of where you plug it in (i.e. wall charger, PC, car).

Thought this might be useful.

Sorry I'm under the posting criteria for linking this video.

htt p://ww w.youtu be.co m/wat ch?v=uPc-ZA3t5aY

Please remove the spaces when entering this link in your browser.

Perhaps some in here have tried this and found it to be successful?
[Galaxy Tab 2 General] DigitalMD:
you don;t need anything special to charge form USB if you turn the power off. WHen power is on, a USB port doe snot have enough current to provide positive charge.
[Galaxy Tab 2 General] arpudam79:
Thanks Dude, its perfectly work for me...
[Galaxy Tab 2 General] positiveg:
I'm gonna try and see if mine charges.

I want to believe that I plugged it in once and even with the x over the battery it was charging though little almost like a trickle but it was plugged in for while.

G

Trying that 1/2 to 3/4 usb plugged in, didn't get it to work.

G
[Galaxy Tab 2 General] faryal:
Didn't work @ my Tab2 7.0

But it's okay with me. Thanks for the share BTW.
[Galaxy Tab 2 General] piyushalf:
it worked

i tried on p 3100 and it worked

thnx
[Galaxy Tab 2 General] saayinla:
Just tried on my p3100 and it works. Thanks, Pic below showing how far in for me.
[Galaxy Tab 2 General] Wild Turkey:
Mine charges without this gimmic. Just dont use it if trying to charge via usb . My mobo has fast charge capability through the ROG port on the back , gonna see if the gtab2 supports it or not.
[Galaxy Tab 2 General] ShapesBlue:
Tried this method also. Doesn't work for me on my 3113
[Galaxy Tab 2 General] Pezmet:
Ok so i noticed some fuss about this for some time now.

The tablet charges via USB regardless of the red x on the battery. Because of the 4000mah battery charging via USB takes too much and in some scenarios like playing demanding games even when connected via USB the demanding game uses more power then the USB can actually charge.

The tab 2 uses 2.1 amps to charge a normal mobile phone uses 1 - 1.5 amps mean while USB offers 0.5 amps.. So in some cases the tablet will not charge do Google decided to show the x for legal reasons while not connected to wall charger..

If this is not clear enough I'll post more from a PC at your request..

All the best.
[Galaxy Tab 2 General] abhisheknitp2014:
Yes , it worked with P-3100 but taking too long time to be fully charged in comparison to its usual way...
[Galaxy Tab 2 General] hooaah:
it worked on P3100, but still slow..
[Galaxy Tab 2 General] AgntOrange:
has anyone tried cutting the data line and retain the power lines of your usb data cable? see if it still needs to be plugged in halfway.
[Galaxy Tab 2 General] ademanyem:
It's worked with me! thank you :)
[Galaxy Tab 2 General] 7_michel:
You can make such a test with a USB-Y cable; see for example (http://intrl.startech.com/Cables/US...l-Hard-Drive-Dual-USB-A-to-Micro-B~USB2HAUBY1)

The white plug has all contacts, if fully plugged the charging cuurent is limited to 500mA

The red plug has only power contacts , no data contacts. The tablet then drain as much current as possible from the USB source.

Ba carefull, the USB source may then blow up if not protected against overcurrent .....

The maximum current I got from different HP computers I tested was around 700mA.... not so high compare to normal level of 500mA.... Is it worth to risk to fire the computer USB connection?

Some results are given here ( in french) http://78michel.unblog.fr/?p=592
[Galaxy Tab 2 General] mhmoud2000:
really it's work thanks man i need anyone to answer me plz which rom u educated me to install in my new tab 2 p3100
[Galaxy Tab 2 General] davuznl:
If you read the usb specs on the usb consortium website you can see exactly how the tab distinguishes between the different connected units. Best charging you would get is by shorting pins 2 and 3 as this will make the tab think it is a charger and pull as much as it can get. When the tab see enumeration data on pin 2 and 3 it knows it is a computer and draw only 500ma. This will make the tab indicate not charging but the 500ma is sufficient to charge the tab allthough slow. Note :apple does not conform to the USB 2.0 spec. Their stuff detects the original chargers by putting different voltages on pin 2 and 3.
[Galaxy Tab 2 General] pmaiden5:
Mine GT-3310 is charging to with this trick. Thanks
[Galaxy Tab 2 General] the_naturat_com:
USB cable charging normally, but very slowly.
[Galaxy Tab 2 General] Kathand:
I talked with Samsung tech support. They confirmed that even with the red X the tablet WILL charge just at a much slower rate. The person even suggested to turn off the tablet if this was the only means of charging.
[Galaxy Tab 2 General] rhodareyes:
samsung netbooks got an option to enable cheargeable usb port, it charges my tab 2 all the time
[Galaxy Tab 2 General] manan97:
WTH It REALLY Works

Man you solved my problem. i live i 1 room in my hostel where i have only one plug point but i did not wanna use the spike guard extender cause its very messy and rooms small so i could only use my laptop or my tablet at once while not losing charge. BIG BIG THANKS
[Galaxy Tab 2 General] vipul.rk24:
Damn! Worked For Me :D

tysm:fingers-crossed:
[Galaxy Tab 2 General] vipul.rk24:
not chargng

Help!

M not able to charge my mobile when its switched on

it only charges when its switched off :(
[Galaxy Tab 2 General] lohtse:
For some reason this doesn't work for me on my p3110 with stock(rooted) 4.2.2 UK rom and agni kernel
[Galaxy Tab 2 General] suvasishngn:
It's charging
[Galaxy Tab 2 General] binded2:
try using a usb 3 port over the usb 2 has a higher power in the port so might charge faster

the power being up too 900mA if i have that right it 900 something LOL
[Galaxy Tab 2 General] oooops_Leo:
Thanks a ton.

It is working for me on P3100. Thanks a ton as i have been struggling to charge it via my lappy and have to carry the bulky adapter with me.

--------

LEO
[Galaxy Tab 2 General] lokesh.3440:
Thanks [MENTION=3251735]droidlover[/MENTION],,this trick really works on my Gt-P3100.........:laugh::laugh::laugh::laugh::laugh:
[Galaxy Tab 2 General] Neosaurus:
Mine charges anyway even if it doesn't say so...
[Galaxy Tab 2 General] tolux77:
The charge rate is damn slow.. I'll try your method and I hope it will be better.
[Galaxy Tab 2 General] messixda:
Its slow even with that trick
[Galaxy Tab 2 General] sychobob:
Go there for the official answer from Samsung:

http://www.samsung.com/us/support/faq/FAQ00051994/58210/GT-P5113TSYXAR#
[Galaxy Tab 2 General] sanads:
great its working
[Galaxy Tab 2 General] Mrbababo:
Sometimes it will still continue to drain when you have apps running in the background
[Galaxy Tab 2 General] rajnish_1604@yahoo.com:
Hi, Its work. Showing charging.

thanks