Database Info

Can the phone tell the different between a charger and a computer?

I just find it stupid that the phone would show a notification for USB connection when I connect it to a charger.

Yes, it can tell the difference. Check in OS monitor, it knows whether you are getting power from USB, or from AC.

My phone thinks my car is a computer. As far as I know, it goes by the current being received -- 500 mA from a computer, 700 mA from the stock wall charger.
Sent from my SAMSUNG-SGH-I897 using XDA App

I don't think it depends on the current.
With my factory charger, if I insert the charger in and kinda pull out one side of it, it will think it's a computer and I can "mount" my sd card. so it might be a certain way the connectors touch inside

saint168 said:
I just find it stupid that the phone would show a notification for USB connection when I connect it to a charger.
Click to expand...
Click to collapse
It depends on the charger, but yes, the phone for the most part can tell the difference. It has to do with the voltage that is put out.

Ikonomi said:
My phone thinks my car is a computer. As far as I know, it goes by the current being received -- 500 mA from a computer, 700 mA from the stock wall charger.
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
It has nothing to do with amperage (unless it is under 500) and everything to so with charging source. Wall chargers basically short the data wires to indicate AC charger and car chargers do not.
There is a thread in accessories forum discussing this and mods to get full charging out of car chargers. I did it by modding an extra cable. My car charger puts out 1 amp but the phone never draws more then ~ 750 mah.
Sent from my MB520 using XDA App

Dungeon47 said:
Yes, it can tell the difference. Check in OS monitor, it knows whether you are getting power from USB, or from AC.
Click to expand...
Click to collapse
Every time I read one of your posts, in my head is McGyver's voice. Hearing him narrate the xda forums is hilarious.
From a phone

The phone can take up to 1000mA of charging current. But only if it detects it is on one of its supported AC chargers. Draw more than 500mA on a PC USB port may damage it. So, there is special wiring needs to be done for the data PINs on the USB port. That's why for generic car charger and wall chargers, it can't only assume it is PC USB port and charges at a slower pace (500mA). You will need the Samsung AC or Car charger to charge at higher current. I managed to mod one of car charger to be recognized as AC charger (no USB prompt). And you really need it because if you're using the phone as GPS navigation device, 500mA won't be able to sustain it (battery will keep be drained). You need 700ma or more.

It also depends if you have your USB connection set to a default if you will get that pop up when you connect it to any other than an AC charger.

Ikonomi said:
My phone thinks my car is a computer. As far as I know, it goes by the current being received -- 500 mA from a computer, 700 mA from the stock wall charger.
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
Yes it does and is sensitive. I have been using a BT headphone charger and I would be perplexed that my phone showed 100% but pull the plug and its at 87% every morning AFTER recalibrating the battery.. LOL
Decided to use the Samsung Charger and no such issues. Needs those extra Milliamps.....

[Q] Does i9000 support qick charge - battery charging spec 1.1 ?

HI,
does the i9000 Galaxy S support the quick/fast charge from battery charging spec. 1.1?
My new pc mainboard does support this via software/driver. And allows to load with up to 1,5A
I couldn't find information on that.

The i9000 is USB 2.0 not USB 3.0, so the answer is no.

not exactly correct
as it does charge faster with a higher AMP output charger.
i use a 2 Ah or 2000 mAh charger in my car and the phone does accept the faster / quick charge
so if your PC has the option to do the higher 1.5 Ah output, it will take it just fine
just like if you have a 1200 mAh wall charger as some people here uses.

I installed the asus driver which installs a service and the aicharger.sys
I restarted.
They tray shows an icon with a plug, but it is crossed. Like disconnected.
I pluged in the i9000 via the usb2.0 port an no changes.
I then pluged the phone in to a usb3.0 port but the icon still shows disconnected (or ai-charging off)
Any ideas?

AllGamer said:
so if your PC has the option to do the higher 1.5 Ah output, it will take it just fine
Click to expand...
Click to collapse
This is the bit that is not exactly correct. Regardless of how the hardware is set up it's up to the phone driver to request a powersupply from the computer. As it is the Galaxy only requests only 2 unit loads (200mA) from the computer, no where near the 500mA max of the USB2.0
So no simply plugging in a more capable computer won't change a thing.

interesting.
Are there any mods or fixes to support more usb power while connected to a pc?

None that I have seen.

ok, so the only possibility to charge faster is, to get an after market 3rd party wall plug with higher current than 700ma?

garbz said:
This is the bit that is not exactly correct. Regardless of how the hardware is set up it's up to the phone driver to request a powersupply from the computer. As it is the Galaxy only requests only 2 unit loads (200mA) from the computer, no where near the 500mA max of the USB2.0
So no simply plugging in a more capable computer won't change a thing.
Click to expand...
Click to collapse
Interesting. So does the SGS actually use all of the 700mA out of the stock factory charger? If I use my 2.1 A charger could I overheat the battery?

Ok I've had it with the speculation. I've got a USB micro socket and plug on order and I'm going to make a pass through cable and measure the 4 different chargers I have here at the moment this weekend so we can put this one to rest
Stay Tunes.

Ok did a test. No the SGS does not use all 700mA. It uses 470mA. Charging is faster from the dedicated charger than the computer. I verified that the phone only draws less than 100mA from the computer socket.
http://forum.xda-developers.com/showthread.php?p=14272927#post14272927

Thank you.
But can I get more current from my PC with ASUS ai Charge?
I installed the driver but the icon in the tray doesn't recognize my Samsung.
That is because it doesn't have something an Apple Product has.
Apple products get more current with that driver/software thing. But the i9000 doesn't work with it.

in the past i checked if it is possible to charge the battery faster, and not Necessarily through the phone.
i asked a guy who works with electronics and he simply explained that everything is possible, even charging the battery to full in a few minutes, but it WILL kill the battery very fast...

yeah i installed to anticipate a quick charge...but all i get is icon with a big cross...
deleting it now......its useless to me...

SpaZzzzz said:
i asked a guy who works with electronics and he simply explained that everything is possible, even charging the battery to full in a few minutes, but it WILL kill the battery very fast...
Click to expand...
Click to collapse
Everything is possible when you charge the battery itself directly, but not when you charge through the phone. The phone is the charger. The computer and the wall plug only provide power to the phone. Unless you go in with a soldering iron there's nothing you can do to speed up the charge beyond what the Samsung wall adapter gives you.

Charging very slow using USB on a PC

Anyone else having this issue? Went from completely dead 0% to now 17% in 2 hours! Maybe it's a bad battery? Used to charge from 0% to full battery in about an hour or less
Sent from my LG-P999 using XDA App

Yeah I have noticed that, it's iffy sometimes it charges normally on my pc then there times when it just crawls like today it was at 57 % for like 1 hour I rebooted it thinking something was wrong.
My phone was very hot tho maybe that had somthing to do with it idk
Sent from my LG-P999 using XDA App

never use your micro usb cable connected to your computer to charge your phone. If your phone is ON and playing music or something else, that will still run down the battery even though it is connected to the computer. Your LG G2x charger that came with your phone is rated at 1 amp. The computer usb port is giving out a fraction of that. Even cheap chargers from China that are 350mA - 500mA will take forever to charge your phone. I use spare Blackberry chargers that are less than $5 and offer 700mA. They are great and cheap.
http://www.amazon.com/BlackBerry-Fo...PN0S/ref=sr_1_1?ie=UTF8&qid=1309054355&sr=8-1

grenademasta said:
never use your micro usb cable connected to your computer to charge your phone. If your phone is ON and playing music or something else, that will still run down the battery even though it is connected to the computer. Your LG G2x charger that came with your phone is rated at 1 amp. The computer usb port is giving out a fraction of that. Even cheap chargers from China that are 350mA - 500mA will take forever to charge your phone. I use spare Blackberry chargers that are less than $5 and offer 700mA. They are great and cheap.
http://www.amazon.com/BlackBerry-Fo...PN0S/ref=sr_1_1?ie=UTF8&qid=1309054355&sr=8-1
Click to expand...
Click to collapse
It's very similar to the TF101; it seems most Tegra devices use a charging cable more like USB 3.0 than 2.0, which pushes a lot more power and charges the device quickly but when plugged into a 2.0 port the charge slows to a crawl. USB 2.0 simply isn't designed to push the amount of power these newer devices require.

When I try this it will not charge my phone. I tried on several computers at home and work Pc's. It actually drains it.
I wonder why that happens???
Not a big deal.
No problem, I always have to take my charger everywhere I Goto be safe.
All computers using USB 2.0 or USB 2.0 add-on cards.
Sent from my LG-P999 using XDA Premium App

grenademasta said:
Your LG G2x charger that came with your phone is rated at 1 amp. The computer usb port is giving out a fraction of that.
Click to expand...
Click to collapse
Yes, a fraction of 0.5. USB ports can provide up to 500mA.

I just charged mine at work using a USB cable plugged into my monitor. I noticed that trying to charge it off my laptop doesn't seem to get me anywhere. It might require using a powered hub or something similar to get enough juice.

I usually slowly lose charge when plugged into the usb at work. Granted the screen is almost always on and the phone being used.

I've noticed the charge rate for differs depending on the usb charger rating.
For example, on my laptop usb, it charges very very slowly. but when plugged into my desktop, it charges just very slowly. So they must have different current ratings.
When using my eee transformer usb plug ([email protected]), it charges the phone very fast, like under 2hrs. When using a usb charger meant for a blueant headset ([email protected]), it takes like 4hrs to charge. Think the stock charger is at [email protected]
I use Battery monitor app to monitor my batt usage/drain. Haven't really paid attention to the battery gain, but from looking at past history graph, think when plugged into the laptop, it supplied like 5-15ma of juice. When plugged into destop it looks like at 55-400ma. The transformer usb provides up to 1200ish ma, and the stock gives 800ish ma.
Now does using different rating chargers affect the battery discharge rate and health of the battery?

Just because a USB port on a PC says it'll output 500ma doesn't mean it will, it's all up to the software. If your PC or phone is cranky and doesn't communicate properly, your computer's USB port will default to 100ma, and you can't charge off that
Mine charges fine on USB unless I'm trying to use it, then it is pretty much break even.

[Q] OTG and Charging

I recently got a Nexus 5 to replace my old Nexus S and really like it. I am having one challenge that I was hoping for help on:
I have got OTG working with stickmount fine, but I am trying to use this Y-cable to charge while using it and I can't get the phone to charge from the cable at all (with or without a USB drive connected). I have been able to get other, non-Nexus's to charge from the cable so it isn't the cable that is the problem.
I am rooted but running a stock kernel and rom - any ideas why it might not be working or if there is a custom kernel that has enabled the capability otherwise disabled in the phone?

Probably you need a modified Kernel like Nexus 7
avalpert said:
I recently got a Nexus 5 to replace my old Nexus S and really like it. I am having one challenge that I was hoping for help on:
I have got OTG working with stickmount fine, but I am trying to use this Y-cable to charge while using it and I can't get the phone to charge from the cable at all (with or without a USB drive connected). I have been able to get other, non-Nexus's to charge from the cable so it isn't the cable that is the problem.
I am rooted but running a stock kernel and rom - any ideas why it might not be working or if there is a custom kernel that has enabled the capability otherwise disabled in the phone?
Click to expand...
Click to collapse
You need a modified Kernel something like the following Kernel. But at the moment it is only available for Nexus 7.
http://mehrvarz.github.io/usb-host-mode-power-management-nexus7/

I'm interested in this too

wicpp said:
You need a modified Kernel something like the following Kernel. But at the moment it is only available for Nexus 7.
http://mehrvarz.github.io/usb-host-mode-power-management-nexus7/
Click to expand...
Click to collapse
I had OTG charging on my Galaxy Nexus as well as the N7. I just tried it too on my N5 with Elemental X kernel, no go. That's odd no one has come out with this feature yet if that's the case as I'm sure it's very sought after especially with people who have the 16gb model like myself that hook up to external hard drives to save space on the phone but they need external power.

Otg + Charging is also very useful when you are playing games using GamePad
t1.8matt said:
I had OTG charging on my Galaxy Nexus as well as the N7. I just tried it too on my N5 with Elemental X kernel, no go. That's odd no one has come out with this feature yet if that's the case as I'm sure it's very sought after especially with people who have the 16gb model like myself that hook up to external hard drives to save space on the phone but they need external power.
Click to expand...
Click to collapse
If you are using a USB Connection Game Pad via OTG, graphics heavy games use too much battery and usually you can not play for long. This also increases the importance of such kernel for Nexus 5 as well. Nexus 5 have smaller battery but it can play decent Graphics.
I do not like Game Pads with Bluetooth connectivity as they have control latency or lag and your moves are not as quick as even the touch screen, where as you use Game Pads to improve your control moves and probably make them better than touch screen.

wicpp said:
If you are using a USB Connection Game Pad via OTG, graphics heavy games use too much battery and usually you can not play for long. This also increases the importance of such kernel for Nexus 5 as well. Nexus 5 have smaller battery but it can play decent Graphics.
I do not like Game Pads with Bluetooth connectivity as they have control latency or lag and your moves are not as quick as even the touch screen, where as you use Game Pads to improve your control moves and probably make them better than touch screen.
Click to expand...
Click to collapse
The PS sixaxis controller worked great on my N7 for a while, no lag in gameplay. Until Asus had to fix it then I could never get it to work properly again.

I think Nexus 5 USB Port is 5 Pin
t1.8matt said:
The PS sixaxis controller worked great on my N7 for a while, no lag in gameplay. Until Asus had to fix it then I could never get it to work properly again.
Click to expand...
Click to collapse
I think that Nexus 5 USB Port is 5 Pin and not 11 pin like Galaxy S4 or Galaxy S3. Can someone please confirm this?
If this is the case will be still be able to Charger Phone and do OTG concurrently or simultaneously ?

Yes but I believe it's something that has to be addressed at the kernel level.
I use a powered USB hub and even though the phone doesn't show any charging animations, going into the battery info screen shows it is charging (though it doesn't say usb or ac, just charging)
from what I have seen it's even less than trickle charge.
USB flash drive mounted.
Screen off
Battery goes up about 1% every 10-15 minutes.
So clearly current is being passed from the hub to the phone. Just not a lot
Sent from my Nexus 5 using xda app-developers app

Can we use QI Wireless Charging along OTG
Alex240188 said:
Yes but I believe it's something that has to be addressed at the kernel level.
I use a powered USB hub and even though the phone doesn't show any charging animations, going into the battery info screen shows it is charging (though it doesn't say usb or ac, just charging)
from what I have seen it's even less than trickle charge.
USB flash drive mounted.
Screen off
Battery goes up about 1% every 10-15 minutes.
So clearly current is being passed from the hub to the phone. Just not a lot
Sent from my Nexus 5 using xda app-developers app
Click to expand...
Click to collapse
I am not sure but can we use QI Wireless charging along OTG. I have read somewhere that it charges but there is a bug in Kernel due to which it does not know that battery is being charged there is no animation or text to show that battery is being charged. Another concern is that if OS does not know about charging and battery is being charged is it not dangerous can it not overcharge and below the battery etc.?

Alex240188 said:
Battery goes up about 1% every 10-15 minutes.
Click to expand...
Click to collapse
I use exactly the same Y-cable from amazon as avalpert. I connect my USB 2.5" harddisk first at the Nexus charger and let it spin up. Then i connect the OTG cable to my Nexus 5 (rooted stock ROM & stock kernel). The battery icon in the status bar has no charging animation but in settings it says its charging. Around 1% in 5-10min. Even if the screen is on.
@ avalpert: U could check the current of your usb drive in the manufacturer's datasheet and subtract this from the current, your charger is able to provide. My Nexus 5 charger can output max. 1.2A at 5V. Maybe you're using another model and there is just little current left to charge as Alex remarked.

But the difference is I was only powering a flash drive which uses next to no power. And still only 1% every 10-15 minutes.
My best guess is that because otg is enabled. The kernel is not able to tell what type of charging type (ac or USB) is connected so it just enables trickle charge as not to cause any problems
Sent from my Nexus 5 using xda app-developers app

Alex240188 said:
Yes but I believe it's something that has to be addressed at the kernel level.
I use a powered USB hub and even though the phone doesn't show any charging animations, going into the battery info screen shows it is charging (though it doesn't say usb or ac, just charging)
from what I have seen it's even less than trickle charge.
USB flash drive mounted.
Screen off
Battery goes up about 1% every 10-15 minutes.
So clearly current is being passed from the hub to the phone. Just not a lot
Sent from my Nexus 5 using xda app-developers app
Click to expand...
Click to collapse
I can confirm this, I use a powered 7 port USB 2.0 hub, and with the original PS: no charging.
Now I took another PS that puts out 2.14-1.7A @ 6-7.5 VDC, and hey presto, charging the phone!
No indicator in the status bar (top screen), but when checking the battery status it clearly states "CHARGING" (see picture OPLADEN 95%)!!
And it charges pretty fast too.....
The mouse is working, as wel as the USB stick is recognized and working!!
The ONLY worry is about the charge....... is 6-7.5 V a battery killer? :fingers-crossed:
Anyone?

Used Voltage and Current Rating details of Power Supply?
dirkzelf said:
I can confirm this, I use a powered 7 port USB 2.0 hub, and with the original PS: no charging.
Now I took another PS that puts out 2.14-1.7A @ 6-7.5 VDC, and hey presto, charging the phone!
No indicator in the status bar (top screen), but when checking the battery status it clearly states "CHARGING" (see picture OPLADEN 95%)!!
And it charges pretty fast too.....
The mouse is working, as wel as the USB stick is recognized and working!!
The ONLY worry is about the charge....... is 6-7.5 V a battery killer? :fingers-crossed:
Anyone?
Click to expand...
Click to collapse
Can you please show the power supply that you are using in the picture? What is the exact voltage you are using 6V or 75.V? And exact current 21.4A or 1.7A?

wicpp said:
Can you please show the power supply that you are using in the picture? What is the exact voltage you are using 6V or 75.V? And exact current 21.4A or 1.7A?
Click to expand...
Click to collapse
I found the rating strange myself as wel, but it is exactly as I mentioned, but since I didn't trust it up ahead, I just went to my basement to see if I had something better, and I found a 5V 2A.
That should be OK, right?

Can you tell the result of using 5V 2A Power Supply.
dirkzelf said:
I found the rating strange myself as wel, but it is exactly as I mentioned, but since I didn't trust it up ahead, I just went to my basement to see if I had something better, and I found a 5V 2A.
That should be OK, right?
Click to expand...
Click to collapse
Yes 5V 2A seems write but I still can not give you any guarantee it might blow your device so do it at your own risk
If you can do this, then please tell how the charging speed is going along OTG use on 5V 2A?

wicpp said:
Yes 5V 2A seems write but I still can not give you any guarantee it might blow your device so do it at your own risk
If you can do this, then please tell how the charging speed is going along OTG use on 5V 2A?
Click to expand...
Click to collapse
Here are the pictures of the PS specs. Hope it clears your question? Pls let me know.

it may be interesting to read this forum / info on 2A charging of the nexus 5...... :
http://forums.androidcentral.com/google-nexus-5/331746-2a-charger-nexus-5-a.html

wicpp said:
Yes 5V 2A seems write but I still can not give you any guarantee it might blow your device so do it at your own risk
If you can do this, then please tell how the charging speed is going along OTG use on 5V 2A?
Click to expand...
Click to collapse
Alright, from 84% tot 97% in 90 minutes.....
That is connected with micro usb otg cable to powered (5vdc 2a) USB hub and with the screen on.
Sent from my Nexus 5 using xda app-developers app

May be we can use fix Voltage and AMP output adapter
dirkzelf said:
Alright, from 84% tot 97% in 90 minutes.....
That is connected with micro usb otg cable to powered (5vdc 2a) USB hub and with the screen on.
Sent from my Nexus 5 using xda app-developers app
Click to expand...
Click to collapse
May be we can use fixed output voltage and amp adapter just like the following
http://www.amazon.co.uk/2000mah-Ada...ds=5V+2A+2000ma+AC+Power+Adapter+Wall+Charger
I know it is up to the device (Nexus 5) that how much load it will put on the adapter to consumer out of 2000ma or 2A. On the other hand I have read somewhere that even most 2000mA USB Chargers just give 500mA in the beginning and due to some data pins activity they start generating 2000mA. If this is the case then Nexus 5 will force only 500mA or so from the charger that it is not compatible with. If we use some adapter that generates constant 5V 2000mA irrelevant of communication on data pins like the ones with 3.5mm pin which does not have any data pins, at least we are guaranteed that, at least full power is coming out of the adapter at all times.

wicpp said:
May be we can use fixed voltage and amp adapter just like the following
http://www.amazon.co.uk/2000mah-Ada...ds=5V+2A+2000ma+AC+Power+Adapter+Wall+Charger
I know it is up to the device (Nexus 5) that how much load it will put on the adapter to consumer out of 2000ma or 2A. On the other hand I have read somewhere that even most 2000mA USB Chargers just give 500mA in the beginning and due to some data pins activity they start generating 2000mA. If this is the case then Nexus 5 will force only 500mA or so from the charger that it is not compatible with. If we use some adapter that generates constant 5V 2000mA irrelevant of communication on data pins like the ones with 3.5mm pin which does not have any data pins at least we are guaranteed that at least full power is coming out of the adapter at all times.
Click to expand...
Click to collapse
I am given to understand that it has nothing to do with the "intelligence" of the charger, but with basic electrical principles.
That would imlpicate that if a device requires 500 mA, the charger will supply 500 mA, if the device would require 3000mA, then it would supply 2000 mA, being it's maximum current (flow).
As far as I know, a powersource ONLY generates a flow (Amps) up to it's maximum limit, if it is connected to a consumer (device). No connected device / consumer leaves no flow to be generated.
Please correct me if I'm wrong.
Added to my little test earlier today: The phone didn't get hot, at most it would be slightly less cool..... for the PS the same.

USB charging issue

Hi all,
My friend's OPO does not charge when connected to the USB port of a computer. It is stock, unrooted, KK 4.4.2.
It charges fine when he charges via the wall charger. My OPO charges fine out of the box, with USB on the same laptop and port.
He does not want to factory reset and I am at a loss here. Please advise what I need to check here.
Thanks!

Oomahey said:
Hi all,
My friend's OPO does not charge when connected to the USB port of a computer. It is stock, unrooted, KK 4.4.2.
It charges fine when he connects it to his TV (he has the US charger but no adapter for Indian plug points). My OPO charges fine out of the box.
He does not want to factory reset and I am at a loss here. Please advise what I need to check here.
Thanks!
Click to expand...
Click to collapse
He can buy a universal adapter for the charger. They're pretty cheap.

It's because the laptop isn't putting out enough current. It must be at least 2a to charge properly.
Transmitted via Bacon

timmaaa said:
It's because the laptop isn't putting out enough current. It must be at least 2a to charge properly.
Transmitted via Bacon
Click to expand...
Click to collapse
The issue here is that my OPO charges through the same USB port and with the same cable. That's what has me baffled.

Well consider me baffled too.
Transmitted via Bacon

Anybody has any idea about this issue?

The front panel of my pc case has usb ports that has trouble recognizing or charging any phone. When I plug it in, the phone will show it charging but the battery continues to drain or I can't access the sdcard. Not sure what causes this, but when I plug my phone into the usb ports in the back that are connected directly to the motherboard, then there is no problem.

kokocabana said:
The front panel of my pc case has usb ports that has trouble recognizing or charging any phone. When I plug it in, the phone will show it charging but the battery continues to drain or I can't access the sdcard. Not sure what causes this, but when I plug my phone into the usb ports in the back that are connected directly to the motherboard, then there is no problem.
Click to expand...
Click to collapse
Thanks for the reply but that is not it. My OPO charges fine from the same port and the same cable.

Anybody got any info on this issue?

Uh, I'd say factory reset or don't worry about it.
Not sure what you expect to hear. But that's probably the first plan of action. Especially since yours works fine.

Opo has higher power requirements. You may need a cable with a 24AWG or better rating (lower allows more current).
Does it work with the stock cable?

tiny4579 said:
Opo has higher power requirements. You may need a cable with a 24AWG or better rating (lower allows more current).
Does it work with the stock cable?
Click to expand...
Click to collapse
My OPO works with any cable, though time to charge is the best on stock cable. But my friend's OPO doesn't charge at all. Even on stock cable.
Unable to make sense of it at all. I may sound like a simpleton, but maybe there is some checkbox I ticked somewhere which is preventing this? UGH!

tiny4579 said:
Opo has higher power requirements. You may need a cable with a 24AWG or better rating (lower allows more current).
Does it work with the stock cable?
Click to expand...
Click to collapse
The phone will work with any cable. Worst-case the cable's resistance and diameter will reduce the maximum charging current significantly but it always will charge the phone.
It's because the laptop isn't putting out enough current. It must be at least 2a to charge properly.
Click to expand...
Click to collapse
No USB port has that much current except maybe for highly specialized ones. USB2 is rated on 0.5Amp, USB3 on 0.9
Of course the phone will take significantly longer to charge or may even discharge when used while plugged in.

I can say "me too". My one also didn't charge from powered off PC while Nexus 5 plugged in the same PC with same cable charges fine.
When PC is powered on, One charges intermittently. I.e. I plug it in, it charges for some time and then stops. "OS monitor" shows "discharging [USB power]" state.
Any thoughts?
Sent from my A0001 using Tapatalk

Cannot charge OnePlusOne via USB
I have the same problem.
The problem seems to have started AFTER upgrading O/S to Cyanogen 12.0.
Cannot charge via USB either from my note PC or Mobile BatteryPak (1.7a).
Above comment that 2a power is required is surprising, as I thought 1a is standard. Maybe there is some Cyanogen bug here?
I found in some Forum to make of SETTINGS - STORAGE - USB COMPUTER CONNECTION, but I do have this setting, and still cannot charge the computer.

taristoblus said:
I have the same problem.
The problem seems to have started AFTER upgrading O/S to Cyanogen 12.0.
Cannot charge via USB either from my note PC or Mobile BatteryPak (1.7a).
Above comment that 2a power is required is surprising, as I thought 1a is standard. Maybe there is some Cyanogen bug here?
I found in some Forum to make of SETTINGS - STORAGE - USB COMPUTER CONNECTION, but I do have this setting, and still cannot charge the computer.
Click to expand...
Click to collapse
Quote from google
In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A)
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It will charge very slowly but will charge faster if the device is off. If you're using it while it's charging it's like filling a bucket up with water that's got a hole in the bottom. It fills up. But slower than it would if there was no hole.
As for the battery pack I have a 2.0a EE Battery pack and it works fine so it might be related to the analogy above.

Sorry to bring up an old topic, But its still hanging and non has really come up with solution. So i thought let's bring some light to it.
My dad has encountered the same issue the other day, I'm basically not much PRO into fixing things like this but by turning on/off USB debugging while connected to PC and also turning on/off Developer options does makes it charging through PC again.
Previously it was charging by PC, but dad has messed up something internally and asked me for help, so this lil so called tricked work for me. I hope this will help others to.