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I figured I would share this since I have not found another thread with this info.
The Galaxy Note 10.1 will charge from usb.
I find this interesting because no tablet, at least none I have known, will do this. They all need to be actually plugged into a wall outlet to charge. However, my note 10.1 has charged from around 13% to 32% plugged into USB. Now, mind you , it doesnt charge very fast, but it does charge.
For some this won't matter. In my case, that 3 ft cord doesnt go from the floor outlet to my desk at work too easily, but the usb will plug in very easily and reach where I need it too. At the very least, it will add a little more time to the length of the batter. I work a 10 hour shift, not adding in the hour for lunch, and I can usually made it about 8 hours. So this may get me the extra two hours I need...hopefully.
phoenixbennu said:
I figured I would share this since I have not found another thread with this info.
The Galaxy Note 10.1 will charge from usb.
I find this interesting because no tablet, at least none I have known, will do this. They all need to be actually plugged into a wall outlet to charge. However, my note 10.1 has charged from around 13% to 32% plugged into USB. Now, mind you , it doesnt charge very fast, but it does charge.
For some this won't matter. In my case, that 3 ft cord doesnt go from the floor outlet to my desk at work too easily, but the usb will plug in very easily and reach where I need it too. At the very least, it will add a little more time to the length of the batter. I work a 10 hour shift, not adding in the hour for lunch, and I can usually made it about 8 hours. So this may get me the extra two hours I need...hopefully.
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Click to collapse
Hmm, I think mine claims not to (it puts an X on the battery icon), but I didn't leave it plugged into my computer long enough to see whether it charged or not. I think all tablets can potentially charge via USB port on a PC, it's just that most disable it out of the box but eg. for the Galaxy Tab 10.1 custom kernels could enable charging over USB.
iofthestorm said:
Hmm, I think mine claims not to (it puts an X on the battery icon), but I didn't leave it plugged into my computer long enough to see whether it charged or not. I think all tablets can potentially charge via USB port on a PC, it's just that most disable it out of the box but eg. for the Galaxy Tab 10.1 custom kernels could enable charging over USB.
Click to expand...
Click to collapse
Mine also puts the RED X over the battery icon whether I try to charge it through a PC USB port or other USB charging port other than the Samsung adapter (Goal Zero 150 usb port and Panatech 10000mah external USB battery pack). The tablet shows that it is charging when i view it using GO POWER MASTER app. Watched it for 5 minutes but with WIFI off, it still dropped from 88% to 87%. I am however using the stock kernel.
It charges faster if you have the screen off. The usb gives more or less what you need to keep it running with the screen on.
Skickat från min GT-I9300 via Tapatalk 2
Mine put the red X on the battery icon as well, but still charged. I had to have the screen off.
I had mind plugged into my USB 3.0 port (which should really make a difference) to transfer some files, and then just left it plugged in and it charges. Its definitely a trickle charge, but I am glad to see it does this, as my a500 did not.
When I transferred 40Gb of data to the mSD via MTP (screen off) and called up the batt-graph after disconnection it showed me a fair charging rate. Not stunning but at least a noticeable charge ( from 63% to 82% in three hours).
So it does charge the battery, in spite of the red X?
Yes it does, albeit very slowly.
You guys are misinterpreting the red x. Just got off the phone with Samsung. The x stands for "extra awesome charging". I swear.
Sent from my GT-N8013 using Tapatalk 2
phoenixbennu said:
I figured I would share this since I have not found another thread with this info.
The Galaxy Note 10.1 will charge from usb.
I find this interesting because no tablet, at least none I have known, will do this. They all need to be actually plugged into a wall outlet to charge. However, my note 10.1 has charged from around 13% to 32% plugged into USB. Now, mind you , it doesnt charge very fast, but it does charge.
For some this won't matter. In my case, that 3 ft cord doesnt go from the floor outlet to my desk at work too easily, but the usb will plug in very easily and reach where I need it too. At the very least, it will add a little more time to the length of the batter. I work a 10 hour shift, not adding in the hour for lunch, and I can usually made it about 8 hours. So this may get me the extra two hours I need...hopefully.
Click to expand...
Click to collapse
Interesting, because every tablet I've owned (Tab 10.1 and Nexus 7) behaved like this.
They will charge VERY slowly on USB - and will likely not charge at all if the screen is on due to the total unit power consumption being >500 mA.
Entropy512 said:
Interesting, because every tablet I've owned (Tab 10.1 and Nexus 7) behaved like this.
They will charge VERY slowly on USB - and will likely not charge at all if the screen is on due to the total unit power consumption being >500 mA.
Click to expand...
Click to collapse
Same here. iPads, nook color, Samsung tablets, all say not charging but do trickle charge if you are doing anything to drain it faster than thenusb can supply. It takes around 8 to 10 hours to charge my gt101 through regular USB 2.0.
mitchellvii said:
You guys are misinterpreting the red x. Just got off the phone with Samsung. The x stands for "extra awesome charging". I swear.
Sent from my GT-N8013 using Tapatalk 2
Click to expand...
Click to collapse
Bwahahaha... A friend of mine posted on twitter that Apple should make something that lets iDevices charge each other... Ours actually can because of USB host! I actually lost the usb host adapter for my old galaxy tab so I need to get a new one but I had one for my gs3, and it does charge my tablet. But the reverse is clearly more useful.
Sent from my SCH-I535 using Tapatalk 2
Tested again when attached to Notebook by USB:
Screen on at max. Brightness and working: batt charge stays level
Screen off: batt charges approx. 5% per hour
Tested on GNote charger (1A output)
Screen on : charging very slowly (approx. 3% per hour)
Screen off: charging approx. 8% per hour
Tested on iPad charger:
Slower than original charger although max. Output:
The more items you have attacht to your computers USB the less power it has to allow your tablet to draw for charging.
donec said:
The more items you have attacht to your computers USB the less power it has to allow your tablet to draw for charging.
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Click to collapse
I don't think this is the case. The USB ports provide a set power output, and not variable by available power supply type of output.
phoenixbennu said:
I don't think this is the case. The USB ports provide a set power output, and not variable by available power supply type of output.
Click to expand...
Click to collapse
You are correct they are not variable but they only have a given amount ofpwer available and if you are drawing the max and add another device that needs more power to charge the power will not be available.
donec said:
You are correct they are not variable but they only have a given amount ofpwer available and if you are drawing the max and add another device that needs more power to charge the power will not be available.
Click to expand...
Click to collapse
Of course, everything has a limited power availability, USB ports being no exception, whether having their own psu or bus powered or whatever your setup may be, but unless you are doing something beyond practical use or have a poorly designed setup, than this should not be a problem. I know some systems out there, the mac book pro for example, specific limits USB power output between ports by design (you may even call it variable haha...but by design). However, in a general sense, you should not have a power output issue with simply plugging in for usb charging., even if all other ports are used up as well. So don't daisy chain, or do anything like that. Practical use should be fine. I personally hook my usb charged devices, like my phone, to my monitor at work. It was a few usb ports on the side, and it works great. Also, it keeps me from having to deal with all the annoying security popups that go with plugging it into the actual computer.
In a probably unfunny but still remotely amusing anecdote, I remember the massive work I put my a500 through. I used to have a usb hub attached with 2 1tb portable hard drives, a keyboard, a mouse, my phones, and more all charging directly from USB. Never had trouble with power issues, aside from quicker draining of the battery. lol.
does anyone know if charging is possible when you use an Y adapter on USB-OTG to hook up an external harddrive and a charger at the same time?
cproaudio said:
does anyone know if charging is possible when you use an Y adapter on USB-OTG to hook up an external harddrive and a charger at the same time?
Click to expand...
Click to collapse
Barring any specific device hardware limitations, it is possible to do data transfer and power transfer at the same time using a y cable. Its essentially the same thing as using a usb hub, except you only have two ports instead of 4 or more.
As for actual practical use on the note, I have not tried it out, and I am not aware of any limitations built into software or hardware to prevent it. So, I do not see you having a problem with it.
Almost all tablets can charge through regular USB2 if they're sleeping (or better - powered off).
USB has power limits (USB1.1 is 100mA, USB2.0 is 500mA and USB3 is 2A) BUT these are the 'minimum maximums', if you will. That is, these are the current source *required* for certification. It's entirely permissable for a USB port to provide as much current as it wants - it just can't be limited to *less* than these amounts.
USB 2.0 and later ports are also supposed to implement 'overcurrent' warnings if the device is taking more current than the port can provide..
That's why, for example, some ports can drive a CDROM or external HD drive without a problem - while other ones can't.
The Note 10.1 needs a little over 2A @ 5V to charge at a reasonable rate.
One other note, if you let your battery drain very low, then the lower current of most USB 2 ports won't be enough to charge it even if it's off. The charge current curve isn't linear.
Anyone else notice the phone randomly doesnt charge when plugging it into the computer?
The battery will say charging, the lock screen will say charging, but the battery screen will say not charging and the graph will show a green charging line but draining battery. Replugging the phone in fixes it. I havent had an issue with the wall charger.
Theres nothing wrong with the USB ports, it charged my other phone fine and it charges this phone when it works.
my N4 charges fast when I plug it to my laptop. I connect it to my USB 3.0 port..
PCs aren't designed to charge phones. It may work for a dumbphone with a 500 mAh battery, but it doesn't have the amperage to charge a smartphone efficiently. The charging adapter that comes with the phone is 1200 mA (milliamps), a computer USB port only provides 500 mA (on USB 2.0). On USB 3.0, it provides 900 mA, so it will charge faster, but not nearly as fast still as the 1.2 amp travel adapter.
On top of this, the phone is constantly using battery power while on, so it is very likely that when the screen is on and you are using the phone plugged into the computer, the phone is drawing power faster than the computer is charging it.
MusicMan374 said:
PCs aren't designed to charge phones. It may work for a dumbphone with a 500 mAh battery, but it doesn't have the amperage to charge a smartphone efficiently. The charging adapter that comes with the phone is 1200 mA (milliamps), a computer USB port only provides 500 mA (on USB 2.0). On USB 3.0, it provides 900 mA, so it will charge faster, but not nearly as fast still as the 1.2 amp travel adapter.
On top of this, the phone is constantly using battery power while on, so it is very likely that when the screen is on and you are using the phone plugged into the computer, the phone is drawing power faster than the computer is charging it.
Click to expand...
Click to collapse
That is not what Im talking about. It says charging everywhere except the battery screen where it says not charging, that is obviously a bug. A computer can power a phone fine anyways, they are made to be powered by a USB port.
idividebyzero said:
That is not what Im talking about. It says charging everywhere except the battery screen where it says not charging, that is obviously a bug. A computer can power a phone fine anyways, they are made to be powered by a USB port.
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Click to collapse
Mine says charging and shows charge icon when connected via USB
idividebyzero said:
That is not what Im talking about. It says charging everywhere except the battery screen where it says not charging, that is obviously a bug. A computer can power a phone fine anyways, they are made to be powered by a USB port.
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Click to collapse
I had this problem today. The battery was dying fast (Average for this one) and I had popped it into my stereos USB, The battery didn't show the charging sign.
WTF? So I switched to the "Cigarette lighter port" and with a different cable plugged that in. No go. Held in the power button to simulate a battery pull, Still didnt work.
Turned it off, Went back to work and three hours later getting ready to drive home i plugged it in. The phone was getting warm, But the battery charging sign never popped up. I turned it on and the left side (By the sim card) was getting ultra-hot but betterbatterystats said the battery was only feeling at around 101degrees (Normal for this small sun). A minute later it was highly uncomfortable to hold (Just near the sim card area), I thought the battery was going to catch on fire like those youtube videos.
I power cycled once again, the battery charging sign popped up and I breathed a huge sigh of relief. Seconds later the phone ****ing flipped its wig, It kept making the charger plugged in sound and vibrate every half second. I about had a stroke, Thinking it's going critical. ONE MORE POWER CYCLE, Everything is normal.
My earlier experience seemed similar to yours OP, Let me know if your phone melts your hand off and goes all bi-polar like mine did.
I'm having the same problem. It has nothing to do with a computer not being powerful enough to charge it, especially when they aren't even being used such as overnight. It has charged every other smartphone that I've used. It will say that it is charging on the lockscreen and on the settings pulldown but it will just constantly drain battery. I will put it on the charger before bed and wake up 8 hours later and it says it is at 86% with a steady decline in battery. This only happens when connected to my iMac and not when plugged into a wall outlet.
I wouldn't think USB 3.0 improves the charging speed at all, since the protocol still uses USB 2.0
I just remove all the cables and replace them. It seems to solve it.
Same with the AC adapter. I noticed sometime it would say charging USB when I switched. I just unplug everything and plug it back in and it goes back to normal.
/shrug
I havent noticed it getting warm, it just doesnt charge even though it knows its plugged in and is supposed to be charging. It works after replugging it in.
It also seems to charge abnormally slowly.
I wonder if the issue with the phone not working right with Nokia chargers (constantly disconnects and reconnects) is related to this. It may not have anything to do with the Qi standard because the phone just doesnt charge right period.
Nexus 7 2012. CM 11 M2 Grouper, - 3-5 hours use daily - Unit is 20 months old.
Until for the first time while playing a game, allowed the device to attempt recharge while continuing with the game after getting a 14% low Battery warning flash on screen.
Factory Charger and connection cable..(this is a 2100 mA strength charger)
The device went dead despite being connected to a charger.
the device went totally dead as the battery drained completely.
the problem appeared to be that the device stayed on and drained the battery.
Opened up the device and charged the battery with a home-made cable - good to go..(98%)
the process involved using 4 sewing needles inserted into the battery connection and crocodile clips to attach, this ensures that the battery is receiving equal current to each side.
this can be done with any type of standard charger but will take longer. the beauty of using the factory charger is that the recharge will only take 3 hours verses 10 hours for a 500 mA type charger. the chargers stop automatically when the battery is fully charged, this would lead one to deduce that any control circuitry related to battery charge levels is inside the charger.
reconnected battery and assembled the unit.
Followed google instructions and used boot menu to switch off device.
turned on device as normal.
Did a factory data reset and wiped all user information.
Set screen brightness to minimum & set battery % inside the charging icon.
Turned off the wi-fi and nfc and everything that could affect battery life.
the device is showing a charging icon when powered off but the battery is not increasing in charge
the device makes a nice noise when the charger is connected.
the device shows the charging symbol in the status bar
the device is not charging and a computer cannot recognise the device.
the device makes charging noises and indications when connected to the computer
the device is not actually charging at all.
there is no apps that could be using unnecessary power. I have stopped the google play service etc. there is only 3 services running.
the loss of power is continuous, even when powered off the device battery continues to loose power.
I am presuming that there is a short circuit within the power sub assembly that is causing this continuous power loss. My reasoning for this is that the operating system is functioning and capable. A fault within the micro usb could cause the effects mentioned above.
the only possible faults are the micro usb port and or the cable that connects the power sub circuit to the motherboard. the cable runs under the battery and the pins are micro size. (it would take 2 people to properly analyse this cable.)
regardless of my particular fault, the advice that i would seek is in regard to any test that I should do to prove either way which part I need to replace.
is there a way to bypass the micro usb connection and power the device via the cable that connects to the motherboard
I have used many different micro usb leads and chargers. The factory charger and lead will charge other devices.
windows 7, windows 8.1, linux mint and ubuntu 14.04 are the different computer systems that will not recognise the device although they will appear to be charging the device without actually increasing the charge at the battery.
I have not found any other nexus users with a similar problem.
Using a moto g, samsung GT9305i, Samsung 5380i, Samsung 5570, all rooted and custom roms.
I will Bluetooth a ROM to the nexus and attempt installation.
Just to eliminate any doubts that could be related to using the m2 version of CyanogenMod 11
i have a Nexus 7 (2012 version) that my daughter-in-law gave me (several years ago) because it would not boot. i previously reinstalled the OS and she was good for a while until the issue resurfaced. so i'd like to reinstall the OS again or install the successor to CyanogenMod.
however, the tablet will not even try to boot now when i turn it on, even if it is plugged in. all that i see is some backlighting. what i would like to know is if this could be due to a battery that is completely dead and can not be charged. i could buy a replacement battery for about $15 but really don't want to waste my money if the tablet should at least boot up when it is plugged in.
gwa000 said:
i have a Nexus 7 (2012 version) that my daughter-in-law gave me (several years ago) because it would not boot. i previously reinstalled the OS and she was good for a while until the issue resurfaced. so i'd like to reinstall the OS again or install the successor to CyanogenMod.
however, the tablet will not even try to boot now when i turn it on, even if it is plugged in. all that i see is some backlighting. what i would like to know is if this could be due to a battery that is completely dead and can not be charged. i could buy a replacement battery for about $15 but really don't want to waste my money if the tablet should at least boot up when it is plugged in.
Click to expand...
Click to collapse
It wouldn't boot up if the battery is completely discharged (and dead), even if you plug in. When was the last change of battery done? If it is the initial one which came with the device, it is likely that the battery is dead.
@gwa000 there is another glitch with the battery of the Nexus 7: if the battery is drained too much, it's not even charging. I ran into a similar situation some time ago and I solved it be disconnecting the battery and re-connecting it again. After connecting the charger I finally got the charging animation.
AndDiSa said:
@gwa000 there is another glitch with the battery of the Nexus 7: if the battery is drained too much, it's not even charging. I ran into a similar situation some time ago and I solved it be disconnecting the battery and re-connecting it again. After connecting the charger I finally got the charging animation.
Click to expand...
Click to collapse
i think that this was the problem, that the battery was drained to much and would not even try to charge. i previously tried disconnecting/reconnecting batter to no avail.
came across this and this solved the problem:
laptopdoctor.wordpress.com/2015/08/26/jumpstarting-battery-in-bricked-google-nexus-7-tablet-from-asus
it partially charged the battery and i was able to complete the charge normally.
now i can at least boot up (sort of). i get the spinning circles ("boot loop"). i've tried the normal Recovery Mode options to no avail so i'll have to reload the OS. i have a feeling that there is a RAM (i.e. memory) or Flash memory (file storage) issue as this has happened before. but i'll post questions concerning those in another thread.
thanks!
I've run into this issue plenty with my Nexus 7 since it isn't used much.
You can plug the Nexus 7 into a 2Amp or greater charger that is on a switch of some sort (power strip, wall switch, etc) and flip the switch on and off roughly every 3 seconds (turn it on until you see the backlight flicker for a second, then turn it off, repeat). For me it takes about 2-3 minutes of doing this and then I get the charging animation.
If you don't have a switched outlet available, removing the USB from the charger (NOT FROM THE NEXUS) and plugging back in works as well, just more tedious.
---------- Post added at 02:00 PM ---------- Previous post was at 01:57 PM ----------
gwa000 said:
came across this and this solved the problem:
laptopdoctor.wordpress.com/2015/08/26/jumpstarting-battery-in-bricked-google-nexus-7-tablet-from-asus
it partially charged the battery and i was able to complete the charge normally.
Click to expand...
Click to collapse
That solution is terrifying. 5V USB is NOT a good way to supply voltage to a lithium cell. If you have a dedicated lithium charger and connected direct that would be one thing but I would suggest never doing what that website suggests again, as unregulated voltage can cause a lithium cell to explode.
pizzaboy192 said:
I've run into this issue plenty with my Nexus 7 since it isn't used much.
You can plug the Nexus 7 into a 2Amp or greater charger that is on a switch of some sort (power strip, wall switch, etc) and flip the switch on and off roughly every 3 seconds (turn it on until you see the backlight flicker for a second, then turn it off, repeat). For me it takes about 2-3 minutes of doing this and then I get the charging animation.
If you don't have a switched outlet available, removing the USB from the charger (NOT FROM THE NEXUS) and plugging back in works as well, just more tedious.
---------- Post added at 02:00 PM ---------- Previous post was at 01:57 PM ----------
That solution is terrifying. 5V USB is NOT a good way to supply voltage to a lithium cell. If you have a dedicated lithium charger and connected direct that would be one thing but I would suggest never doing what that website suggests again, as unregulated voltage can cause a lithium cell to explode.
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Click to collapse
believe me i was sort of apprehensive about doing it and only did it for two 15 minute cycles!! if it happens again i'll try your method. when i was trying to charge it normally i was using my Nexus 7 (2013) charger which outputs only 1.35A (since my daughter-in-law never gave me her charger). i ended up completing the charge using my Asus laptop charger which is 2.0A (which is what the original Nexus 7 (2012) version used). don't know it i tried using the 2.0A charger from the outset would have allowed it to charge. my impression is the that amperage only affects the speed of charging. plus from what i read on the net if the battery gets in a deeply discharged state the normal charging would not work. although i will try your method should this re-occur.
thanks!
gwa000 said:
believe me i was sort of apprehensive about doing it and only did it for two 15 minute cycles!! if it happens again i'll try your method. when i was trying to charge it normally i was using my Nexus 7 (2013) charger which outputs only 1.35A (since my daughter-in-law never gave me her charger). i ended up completing the charge using my Asus laptop charger which is 2.0A (which is what the original Nexus 7 (2012) version used). don't know it i tried using the 2.0A charger from the outset would have allowed it to charge. my impression is the that amperage only affects the speed of charging. plus from what i read on the net if the battery gets in a deeply discharged state the normal charging would not work. although i will try your method should this re-occur.
thanks!
Click to expand...
Click to collapse
Glad it's working! I use an old HP touchpad charger or an Anker charger for all my devices.
The underlying cause of it not booting is due to the battery having smart protection so it doesn't explode when it gets too low. A multimeter will say 0v on the battery controller output, but if you were to probe the actual battery cell output it may be anywhere from 1.8v to 3v. I'm not sure the exact cutoff voltage. If the physical cell was at 0v it would never recharge, it would just explode once power is applied.
The method online and my method both do the same thing. We shock the smart controller and trick it into charging. My method is a trickle charger method, where regulated charging voltage is applied for a few seconds safely until the tablets charging circuitry detects if the battery is OK or not. The 3 seconds it takes to flash the display is that initial test. When it fails the test the charging circuitry shuts down.
By blasting 5v into what is probably a 3.3v (or 6.6v) circuit, you're doing the same thing, but just bypassing the tablet charge circuitry that shuts down when it can't see the battery.
I will say the toggle power to the charger method works for anything that has a battery, to a point. I've had it work for windows tablets and laptops, iPods and iPads, even the occasional USB battery bank.
Hello all,
First thread here and hoping you guys and girls with more experience can help.
Basically I am fitting my nexus 7 2012 in my car but its got the common charging problem where my battery drains faster than I can charge it.
I have ordered a new USB port strip as I've read that can fix it and fingers crossed with that.
My problem/requirement:
1. I want to charge the tablet via the usb port using a hardwired 5V 2A device this will be plugged into a otg y splitter which is then plugged into the tablet.
2. The USB A side of the splitter I want to connect to my cars ECU (it has a USB port) so I can read the data on that (basically a very expensive memory stick)
I wanted to confirm that this would work and id be able to read data at the same time as charging it.
I also wanted to double check I'm not somehow going to send my 5v 2a power down into my ECU and set it on fire
On a side note, if my new USB port replacement doesn't solve the issue of charging the tablet i will have to remove the battery and hardwire it in, will i still be ok with using the USB port for the ecu while charging hardwired with no battery?
Kind Regards
Tim
Getting any USB 2.0 device to take current while hosting is tricky.
Usually it involves talking directly to the PMIC (power management IC).
If it's a fixed installation, why not remove the battery?
It will avoid the grief of the battery swelling up, which is not too unusual for things plugged in all the time.
I've been using a Nexus 7 (2013) for a few years, but just charging on USB.
It started falling out of its nice holder.
That's when I realized that the battery was all puffed up making the back convex.
I cut off the battery cell itself on the metal tabs and soldered in wires to a 4 V 2 A supply.
I found out that the BMS is a bit balky, it refused to turn on.
So I connected it to USB to "charge" it for about 10 seconds.
Then I could turn it on (without the USB).
Ok, I could have bypassed the BMS entirely but that can be a whole 'nother can of worms too.