[Q][Solved]My Nexus 7 is very slow to charge

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Nate2

Nate2

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Dec 11, 2010
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bsoplinger

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Nate2 said:
It is an option you can turn on in this app:
https://play.google.com/store/apps/details?id=ccc71.bmw
Click to expand...
Click to collapse
The Pro (paid) version of that widget can be configured to run without an actual widget and post the info shown 1 line per update in the notification area. I find it easier than looking at the stats info. Also makes it easy to see if my tablet was charging when docked. (That issue disappeared with new cable and charger.)

Sent from my Nexus 7 using Xparent Purple Tapatalk 2
 
jfmcbrayer

jfmcbrayer

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Nate2 said:
My Nexus 7 is on Android 4.1.2. I did not "upgrade" to 4.2.x, so all numbers posted by me in this thread pertain to the operation of the N7 on the 4.1 kernel.
Click to expand...
Click to collapse
That's pretty damaging to the latest theory then.

I can verify that for me, the procedure posted above (charge on USB, then switch to charger) does not work. But then, I've become convinced my stock charger is damaged, so my test may not really be applicable..
 
jfmcbrayer

jfmcbrayer

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May 9, 2011
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On the other hand, at one point today, my N7 got confused and was treating my trusty Archos charger as USB. The shuffle mentioned above did end the confusion.
 
crip

crip

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Awesomeness can't believe that easy flipped charger you fookn rox..
PalmerEldrich said:
I have a little insight to share on this topic that might apply to some of you.

I bought mine back in december from costco and had no issues up until last night.

Up until then it had been sitting on its official charging dock by asus underneath my TV plugged to a big UPS along with my TV and amp.
Last night I decided to move it into my bedroom cause I wanted to start using it as a clock and to listen to music or podcasts before sleeping and to wake me up. Even before I got the dock the OEM charger was always done within 2.5 hours at most from a very low state like under 10% cause I was using the hell out of it back then.

I had to do 2 things in order for this to be practical for me.

1. The damn usb cable they give you is so short you couldn't hang a mouse with it so I changed it for one twice as long.

2. I plugged the OEM charger and dock to a APC Surge Arrest, Not a piece of crap power bar (or so I thought).

And here is what happened.
I went to bed with the battery at about 22% and when I woke 8 hours later the battery had only managed to get up to 57% which is unacceptable.

I then did 1 thing I unplugged it from the APC Surge Arrest (POS power bar that I might soon throw in the trash!) and straight to a wall outlet. I did not shut it off simply put it on sleep/standby instead of letting it be daydream clock.

Then I came here and read this thread, I at first had the suspicion that maybe it was the USB cable I switched but after reading somebody's comment about polarity I thought perhaps I was a tired last night and plugged it in the wrong way. It's pretty easy to do that actually and its still a possibility that it was plugged to the APC the wrong way.

After reading all the comments here and getting a coffee, Which maybe took me 10-15 minutes at most I went back to check on it.
At this point it was already at 60%. Then instead of putting it to sleep I just let it as I normally would on Daydream clock and by the time I finished typing this message it was at 65%. This fast charge is normal for the dock.

So problem is solved here it was the power brick that it was plugged to or possibly the polarity. I am going to know today if that is the case because I have a Nexus 10 charger that I also plugged into that same power bar last night so next time it needs a recharge I will keep an eye on its progress. If the Nexus 10 charges up fine then either the ASUS charger does not like the APC Surge Arrest or it was plugged the wrong way or the outlet on the APC that I used was bad or something and if its the latter that thing is still going into the trash.

For those plugged with the charger straight to the wall I would recommend the following.

A. Make sure its plugged in the right way or just reverse however its plugged in now.

B. Try another outlet and if that's also slow maybe have them tested with a tester or looked at by a electrician.

But if you are plugging them into some kind of power bar / surge protector then do try them directly to the wall and see if that helps.

90% of the homes I had lived in have had crap power installations, Way too many outlets on the same breaker or missing grounds so on which is why I always end up redoing them or installing separate outlets on their own breakers for my gear like my PC's and TV's.

Just my 2 cents. I went from terrible charging rates like those describes 3% per hour up to how it should be so hope this helps some of you.

Having to RMA my n7 would have been a real bummer. Especially if it would have been for nothing.

To add one last thing to my long winded post. Don't even bother trying to charge it via any kind of USB port on your computer its so slow you might as well have it on a hamster wheel with a dynamo. You really do need a real charger or the wait is unbearable.
Click to expand...
Click to collapse
 
jfmcbrayer

jfmcbrayer

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May 9, 2011
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For what it's worth, I bought an HP Touchpad charger off of FleaBay, and with the Monoprice cable, it charges around 1400 mA (as shown by CurrentWidget, which seems to show net current (charging minus usage)) as compared to around 800 mA for the Archos charger, and < 200 mA for my -- apparently broken -- stock charger.
 
someone755

someone755

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Sep 27, 2011
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Well I've narrowed my issue down to the tablet itself. Tried many power outlets (in 3 apartments, in 3 countries, at least 10 in each apartment -- at least one of these would not be broken), many chargers, many cables.
But the thing always receives less than the charger outputs. A lot less... (Also tried with a phone charger -- input is 200 mA at best)
Seeing as the mA the tablet gets tops out at 700 (if I'm lucky, usually less than 450), I'm beginning to wonder what's wrong. Pulling the battery is only a temporary solution, as it only helps for mere seconds. Restarting doesn't help either, nor does charging when the tablet is off. Also tried the 'connect-to-PC-via-USB-and-then-plug-it-in-a-charger' trick, but no luck...
Estimated charge time from 0 to 100% is around 10 hours, that's 10%/hour. If I'm lucky enough to get 700mA from the charger, it takes around 7-8 hours.
Now what in the world could be causing this?
I see we don't all have the same issues -- some have broken chargers, cables, some have broken kernels. Maybe we all have different hardware versions? Mine is a er3, or so I think. Will check again, as I'm not sure...
I'll download the official 4.1 ROM once I get home from vacation (the Wi-Fi is so bad, I'll be lucky if xda servers even get this message :p). Just to see if it's really kernel -- or any software for that matter -- related.
Or maybe I just have so much sh*t on the poor thing...?
Anyways, will get back with results hopefully this Sunday. Am always alert, watching this thread in case somebody gets any idea what all this could be. :D
Cheers from Croatia! C:
 
E

einjelhart

Senior Member
Feb 21, 2013
62
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charging

how come you can use the vise versa charging for your nexus, if you can check the end of usb cable is not same cut. you mean if im going to plugged the cable to my nexus port vise versa this will work. anyway i just replaced the original usb cable by other brand logitech and plugged it to my nexus it charges faster now than the original usb cable. i wanna try your tricks by doing other way of inserting the cable but i'm afraid because of the polarity or the right way to use this usb cable.
 
someone755

someone755

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Sep 27, 2011
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No, no, no. You don't flip or turn the cable. You turn the charger itself.
Now imagine your charger being this letter: h.
The USB port is on the top, the forks that go in the wall are on the bottom.
You take it out if the power outlet and rotate it 180° in this direction: -->
Oh, yeah, and that also didn't work for me (on more than thirty outlets).
 
K

kentfor

Senior Member
Aug 7, 2012
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New charher

For what it's worth ... after months of dinking around ... a brand new OEM charger from Amazon had me back to normal duration charges immediately.

Crazy to have to replace a charge so soon? Yes.

Worth it to end my frustration? Yes.
 
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jastonas

jastonas

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Jul 1, 2010
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someone755 said:
Well I've narrowed my issue down to the tablet itself. Tried many power outlets (in 3 apartments, in 3 countries, at least 10 in each apartment -- at least one of these would not be broken), many chargers, many cables.
But the thing always receives less than the charger outputs. A lot less... (Also tried with a phone charger -- input is 200 mA at best)
Seeing as the mA the tablet gets tops out at 700 (if I'm lucky, usually less than 450), I'm beginning to wonder what's wrong. Pulling the battery is only a temporary solution, as it only helps for mere seconds. Restarting doesn't help either, nor does charging when the tablet is off. Also tried the 'connect-to-PC-via-USB-and-then-plug-it-in-a-charger' trick, but no luck...
Estimated charge time from 0 to 100% is around 10 hours, that's 10%/hour. If I'm lucky enough to get 700mA from the charger, it takes around 7-8 hours.
Now what in the world could be causing this?
I see we don't all have the same issues -- some have broken chargers, cables, some have broken kernels. Maybe we all have different hardware versions? Mine is a er3, or so I think. Will check again, as I'm not sure...
I'll download the official 4.1 ROM once I get home from vacation (the Wi-Fi is so bad, I'll be lucky if xda servers even get this message :p). Just to see if it's really kernel -- or any software for that matter -- related.
Or maybe I just have so much sh*t on the poor thing...?
Anyways, will get back with results hopefully this Sunday. Am always alert, watching this thread in case somebody gets any idea what all this could be. :D
Cheers from Croatia! C:
Click to expand...
Click to collapse

Any news?

I sent mine to asus service. When it got back, it worked for a couple of days, then it got worse. I've sent it back again...

Sent from my GT-I9505 using Tapatalk 4 Beta
 
someone755

someone755

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Yup, a lot of news.
Installed a factory image 4.1.2. The battery didn't seem to get any better (a calibration issue maybe?), but then I got the notification whether or not to update to JDQ39. What the heck, I said, and now things seem to be getting a lot better.
I get at least 1200 mA out of the charger, and that translates roughly to at most three hours and a half of charging. That's 3.5 hours, mind you.

I think I'll do a calibration, see if it helps. Though I'm sorry I never did one on 4.1...
The question remains, though, what was the matter? Obviously it wasn't the kernel, maybe it was overloaded with my installed apps? Or my kernel wasn't quite as good as I was lead to believe? Weird, but all's well that ends well, I guess. IF this is the end, of course... :p

I just did all of the flashing at 3 in the morning, so please understand the delay (I literally just woke up). Now it's 9:21, CET. :p
 
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someone755

someone755

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Sep 27, 2011
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Okay, an update!
After some time with my pure AOSP-ish Nakasi on build JDQ39, I can positively say that wiping EVERYTHING that you have on the device does not help. (I thought installing a factory image doesn't touch the SDcard. Oh no, my game progress! ;-;)
I've tried finding the Google support email, to really see what's up with all this, as it's obviously a hardware issue (unless both 4.1 and 4.2 are broken, which I doubt, but I do not exclude this option). If it is indeed a software issue, we can only pray that 4.3 brings the needed fixes. If it's a hardware bug, then, well... I just hope your warranty isn't out yet.

Good thing I still got mine. Just gotta lock the bootloader and everything's gonna be fine and dandy. (I paid an extra 30$ in the shop where I bought it so that no matter what happens, they'll fix it. For 3 years. Even if the entire screen is broken. Good deal, eh?)
Will be relocking, flashing a factory image, using it for a week, and then go have a talk with the shop people. Will report EXACTLY what they did to the tablet and I hope it works. (They might replace the USB port, some cables, chips, the entire board, or even replace the tablet in whole. I don't know how skilled these people are, so anything might happen.)


P.S.
Anyone got that Google support email? I'd like to have a word with them before I relock the BL...

Allt the best,
--someone755
 
someone755

someone755

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Sep 27, 2011
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Even more news! After the completely legit OTA 4.3 update, I've come to notice a bit faster charging. First there was no charging (talking just 4.3 here), then there was the 12 hour charging and now it's normal.
Did a new factory image restore, the 4.1 one and got updates via ota. No root or any modifications, not even a recovery, just an unlocked bootloader.

Maybe it's just temporarily so, maybe El Goog actually fixed something...

I'm having a slight hunch that different hardware versions may be the cause of this. Mine is ER3, definitely, can ask you people post yours (in case you haven't bought the new nexus 7, that is)?

Thanks!
 
someone755

someone755

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Sep 27, 2011
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You got a point there, maybe my cable has dirt on it (or the charger has dust inside)... Though I always do that for every charger before I put my device in, so...
Also, you say that the N7 is from 'twenty-thousand twelve'... No offence, just a heads up :p
(Tip: it's either two-thousand twelve or twenty-twelve)

Still got a like from me, though :D
 
ianmedina

ianmedina

Senior Member
Jun 21, 2011
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someone755 said:
You got a point there, maybe my cable has dirt on it (or the charger has dust inside)... Though I always do that for every charger before I put my device in, so...
Also, you say that the N7 is from 'twenty-thousand twelve'... No offence, just a heads up :p
(Tip: it's either two-thousand twelve or twenty-twelve)

Still got a like from me, though :D
Click to expand...
Click to collapse

Lol. But i swear it's really working!

Sent from my Nexus 7 using xda app-developers app
 
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someone755

someone755

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Okay, this thing is actually working!
Though if I unplug the tablet and plug it back in 5 minutes later, the charger output drops to ~600-850 mA.
There are still questions to be asked and answered, but I'm way too noob to figure them out... :p

Semi-temporary solution, but I guess I'll live.
 
mrhomiec

mrhomiec

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Aug 9, 2010
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short story, ever since i manually flashed 4.3, i've had slow charge times.

long story, i've had this rooted for almost a year now, and just a few weeks ago, i unrooted to 4.2.2. even while i was still rooted, and the first few weeks of unroot, i did not have any slow charge issues. then a few days ago, i plugged it at about 10%-20% charge around 10pm, woke up at 5am and it was only up to 47%.

i followed a suggestion from this post- http://xdaforums.com/showpost.php?p=39107960&postcount=4

i tested a battery drain to 10%, powered off, then charged for 75 minutes. i powered on, and it only got to 27%.

i'm highly doubting it's the USB cable or wall charger, as i'm using the same cable and charger as i was before i installed 4.3. could it be because i manually flashed 4.3, and not an OTA? or not even sure that's an issue since it's not really charging very well when powered off.

and for the sake of argument, i have tried 1 additional cable, and 1 additional wall charger, both with slow results. not sure on the exact numbers tho.
 
ianmedina

ianmedina

Senior Member
Jun 21, 2011
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mrhomiec said:
short story, ever since i manually flashed 4.3, i've had slow charge times.

long story, i've had this rooted for almost a year now, and just a few weeks ago, i unrooted to 4.2.2. even while i was still rooted, and the first few weeks of unroot, i did not have any slow charge issues. then a few days ago, i plugged it at about 10%-20% charge around 10pm, woke up at 5am and it was only up to 47%.

i followed a suggestion from this post- http://xdaforums.com/showpost.php?p=39107960&postcount=4

i tested a battery drain to 10%, powered off, then charged for 75 minutes. i powered on, and it only got to 27%.

i'm highly doubting it's the USB cable or wall charger, as i'm using the same cable and charger as i was before i installed 4.3. could it be because i manually flashed 4.3, and not an OTA? or not even sure that's an issue since it's not really charging very well when powered off.

and for the sake of argument, i have tried 1 additional cable, and 1 additional wall charger, both with slow results. not sure on the exact numbers tho.
Click to expand...
Click to collapse

Try the video i posted here. It's actually working.

Sent from my Nexus 7 using xda app-developers app
 
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    pepperbreath
    Solved! (at least for me)

    I suspected this was hardware for a while since this issue would happen no matter what ROM was on there and no matter how many times I did a factory reset. Knowing that I'm just out of warranty and that Asus would probably charge me a hefty fee for fix it, I figured I had nothing to lose. Read my own thread on the issue to see what troubleshooting steps I had already tried here: http://xdaforums.com/showthread.php?t=2390222

    Anyway, I took the back off and then removed the battery (the connection was fine btw). I removed the three screws that held the speakers in place. Then, suspecting that the small connections might need to be rewet, I plugged in my soldering iron and rewet the following areas in black (image borrowed from iAppleDev as I forgot to take my own) :



    For insurance, I also folded up a small piece of paper and placed it where the blue box is. Screwing the speakers back in place held the paper in place and held the ribbon cable retainer clip against the connectors, giving a stronger connection.

    I turned off my Nexus 7 with a 9% battery and then when to take care of other things. Came back in an hour or so (probably less) and I see that the battery is already at 33%! This is with the Asus charger plugged in, which wasn't working at all previously.

    Very stoked. Kinda bummed I didn't figure this out before a conference I had to go to last week. Would have been nice to read on my Nexus 7 instead of my phone.
    View
    5
    P
    PalmerEldrich
    I have a little insight to share on this topic that might apply to some of you.

    I bought mine back in december from costco and had no issues up until last night.

    Up until then it had been sitting on its official charging dock by asus underneath my TV plugged to a big UPS along with my TV and amp.
    Last night I decided to move it into my bedroom cause I wanted to start using it as a clock and to listen to music or podcasts before sleeping and to wake me up. Even before I got the dock the OEM charger was always done within 2.5 hours at most from a very low state like under 10% cause I was using the hell out of it back then.

    I had to do 2 things in order for this to be practical for me.

    1. The damn usb cable they give you is so short you couldn't hang a mouse with it so I changed it for one twice as long.

    2. I plugged the OEM charger and dock to a APC Surge Arrest, Not a piece of crap power bar (or so I thought).

    And here is what happened.
    I went to bed with the battery at about 22% and when I woke 8 hours later the battery had only managed to get up to 57% which is unacceptable.

    I then did 1 thing I unplugged it from the APC Surge Arrest (POS power bar that I might soon throw in the trash!) and straight to a wall outlet. I did not shut it off simply put it on sleep/standby instead of letting it be daydream clock.

    Then I came here and read this thread, I at first had the suspicion that maybe it was the USB cable I switched but after reading somebody's comment about polarity I thought perhaps I was a tired last night and plugged it in the wrong way. It's pretty easy to do that actually and its still a possibility that it was plugged to the APC the wrong way.

    After reading all the comments here and getting a coffee, Which maybe took me 10-15 minutes at most I went back to check on it.
    At this point it was already at 60%. Then instead of putting it to sleep I just let it as I normally would on Daydream clock and by the time I finished typing this message it was at 65%. This fast charge is normal for the dock.

    So problem is solved here it was the power brick that it was plugged to or possibly the polarity. I am going to know today if that is the case because I have a Nexus 10 charger that I also plugged into that same power bar last night so next time it needs a recharge I will keep an eye on its progress. If the Nexus 10 charges up fine then either the ASUS charger does not like the APC Surge Arrest or it was plugged the wrong way or the outlet on the APC that I used was bad or something and if its the latter that thing is still going into the trash.

    For those plugged with the charger straight to the wall I would recommend the following.

    A. Make sure its plugged in the right way or just reverse however its plugged in now.

    B. Try another outlet and if that's also slow maybe have them tested with a tester or looked at by a electrician.

    But if you are plugging them into some kind of power bar / surge protector then do try them directly to the wall and see if that helps.

    90% of the homes I had lived in have had crap power installations, Way too many outlets on the same breaker or missing grounds so on which is why I always end up redoing them or installing separate outlets on their own breakers for my gear like my PC's and TV's.

    Just my 2 cents. I went from terrible charging rates like those describes 3% per hour up to how it should be so hope this helps some of you.

    Having to RMA my n7 would have been a real bummer. Especially if it would have been for nothing.

    To add one last thing to my long winded post. Don't even bother trying to charge it via any kind of USB port on your computer its so slow you might as well have it on a hamster wheel with a dynamo. You really do need a real charger or the wait is unbearable.
    View
    5
    ianmedina
    ianmedina
    Guys.... i have a friend from asus who told me that if you have slow charging problem you gotta do this.


    use the stock asus usb cable
    plug it in to your computer and make sure it's charging via USB, then just wait for 3 minutes then
    unplug it, charge/plug it in via AC using stock asus 2A charger. then wait for atleast 5-8 mins
    then check it if it's starts to charge quickly. =)

    Hit thanks if it's working.
    View
    3
    bsoplinger
    bsoplinger
    Much as I love my Apple products the way the company chooses to ignore existing standards and invent their own is frustrating. Relating to this thread this has lead to 2 standards for power supplies (chargers): the Apple standard and the USB standard defined in the USB 2 (and later) specifications. Originally the Nexus 7 used the USB spec of shorted data wires to decide if it should attempt to draw more than the spec 500ma a USB device is allowed to draw when connected to a computer. As of the update to Android 4.2 Google added smarts to the charging code in an effort to get the tablet to draw high power charging current from a charger using either standard. I'm convinced that this results in the tablet getting confused and chooses to only draw current at the lower 500ma rate. Perhaps the brand of cable results in electrical noise on the data lines which fools the tablet into thinking that there's a data connection. Regardless of what happens, plugging it into your computer will make a real data connection. Then moving to the charger will make a charge style connection and since it happens immediately after a real data connection the tablet has no problem deciding to shift to a high power current draw.

    Sent from my Nexus 7 using Xparent Purple Tapatalk 2
    View
    2
    ianmedina
    ianmedina
    guys i made a video on how to fix slow charging issue of your Nexus 7. i hope it helps.

    http://www.youtube.com/watch?v=bZFcfirYvuA
    View

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