Re: extremely slow charging, any fixes?
What issues are you concerned about? This whole thread is caused by using incorrect chargers.
What issues are you concerned about? This whole thread is caused by using incorrect chargers.
Nexus 7: extremely slow charging, any fixes?
- Thread starter zer0n1nja64
- Start date
Re: extremely slow charging, any fixes?
Jerry...if you read the thread before responding only to the title, you would see limited people have slow charging even with the official charger and with high output (2+Amp) chargers. Others have insensate screens. Or broken GPS. Or unexpected persistent battery drain. For a supply-limited user base it begins to sound like everyone will have at least one major problem. The two N7s I've put my hands on both had choppy scrolling, which is a sore spot for me.
You didn't even read my post which you quoted ^^^^ which clearly says I've been digging through the forum. IE reading many threads both old and new. Not just this one. My current device has only *one* commonly reported risk, and it is 100% preventable by plugging it into a charger at or above 10% remaining battery. It is also fixable at home by the end user.
Jerry...if you read the thread before responding only to the title, you would see limited people have slow charging even with the official charger and with high output (2+Amp) chargers. Others have insensate screens. Or broken GPS. Or unexpected persistent battery drain. For a supply-limited user base it begins to sound like everyone will have at least one major problem. The two N7s I've put my hands on both had choppy scrolling, which is a sore spot for me.
You didn't even read my post which you quoted ^^^^ which clearly says I've been digging through the forum. IE reading many threads both old and new. Not just this one. My current device has only *one* commonly reported risk, and it is 100% preventable by plugging it into a charger at or above 10% remaining battery. It is also fixable at home by the end user.
FIXED!!!
and i didnt wait for google to solve it. they take ages.
as one of the pioneers of this thread, trust me i have tried everything, and started solutions you can see if you back track a bit.
what does not work/or temporary works but not permanent:
>OS downgrading
>bootloader upgrading
>plug unplug with battery monitor (temporary)
>reseating battery cable
>changing chargers/cables/using OEM
>all else above
what works:
>dock
from what i observe, some symptoms of failure started prior to kitkat, as to some of the nexus' handled to me. and some kitkat dont have it.
and the dock works. led me to conclude it might be hardware, probably with the USB
THE FIX:
OPEN YOUR NEXUS 7 AND RESEAT THE USB CHARGING PORT FROM THE INSIDE. if you do not know how, this video will guide you:
How to Fix Nexus 7 charging port, headphone jack, Speakers Guide - YouTube
as you can see the 4:07 in the video is the most important, remove the usb port/audio port completely and reseat it, place it back tightly.
my tab was left at 0% charge, unable to charge anymore, so i was left with the option to tinker it. which to my delight, it charges now at 500-900mah. i tried to drain it and charge again charging-recharging 3 times before posting it here to make sure it was not sheer luck, and so it did.
its a hardware problem guys. i just wish google/asus had the courage to admit it rather than we find it ourselves. go ahead try it. post if it works
for you. it worked for me.
and i didnt wait for google to solve it. they take ages.
as one of the pioneers of this thread, trust me i have tried everything, and started solutions you can see if you back track a bit.
what does not work/or temporary works but not permanent:
>OS downgrading
>bootloader upgrading
>plug unplug with battery monitor (temporary)
>reseating battery cable
>changing chargers/cables/using OEM
>all else above
what works:
>dock
from what i observe, some symptoms of failure started prior to kitkat, as to some of the nexus' handled to me. and some kitkat dont have it.
and the dock works. led me to conclude it might be hardware, probably with the USB
THE FIX:
OPEN YOUR NEXUS 7 AND RESEAT THE USB CHARGING PORT FROM THE INSIDE. if you do not know how, this video will guide you:
How to Fix Nexus 7 charging port, headphone jack, Speakers Guide - YouTube
as you can see the 4:07 in the video is the most important, remove the usb port/audio port completely and reseat it, place it back tightly.
my tab was left at 0% charge, unable to charge anymore, so i was left with the option to tinker it. which to my delight, it charges now at 500-900mah. i tried to drain it and charge again charging-recharging 3 times before posting it here to make sure it was not sheer luck, and so it did.
its a hardware problem guys. i just wish google/asus had the courage to admit it rather than we find it ourselves. go ahead try it. post if it works
for you. it worked for me.
I am glad you got your unit fixed. I have had devices have issues with their USB port after they fell while charging or I grab them forgetting to disconnect the charging cable after a debugging session. Preventing damage to the USB connector is one of the many reasons I prefer to use wireless charging.
Regarding getting a manufacturer to admit that they are device is faulty, unless it happens when the device is pulled out of the box they are going to claim (and maybe rightly so) that it is the user's fault.
Regarding getting a manufacturer to admit that they are device is faulty, unless it happens when the device is pulled out of the box they are going to claim (and maybe rightly so) that it is the user's fault.
One of the best things about my old Echo is its charging port 
I can still dangle it and swing it around from the original charging cable.
Glad to hear yours could be reseated.
I can still dangle it and swing it around from the original charging cable.Glad to hear yours could be reseated.
Hi. I wanted to ask you if Nexus has recalled the tablets that fail to charge in 2-3 hours. I have a Nexus Asus 7 version 4.4.2 tablet and it does take 12 hours. Granted its full of gaming apps my kids play and I have no idea what's causing drain. I checked the battery status and the screen brightness drains 62% of the battery. I have it set on auto brightness. The other uses range from 8-3% including Android system, User:Kids, Google play services and Android OS. Any other clue as to where to see if I have malware, bad apps or a bad resistor, like you mentioned in the previous thread?
Staci
Staci
GSDer
Well-known member
- Jan 30, 2011
- 8,469
- 15
- 0
How long does it take to charge if you first turn it off completely? If you were to assume that the battery was completely dead, it should take no more than ~2.92 hours to charge if you're using the stock charger that came with the unit (3950 mAh battery capacity / 1350 mA = 2.92 hours). If it charges normally in that configuration then we can look at anything unusual that might be going on when it's powered on. If it doesn't charge normally when it's off then it may be the:
- wall transformer
- USB cable
- micro-USB port
- charging circuit
Sent from my rooted, debloated, deodexed Sinclair ZX-80 running CM -0.001 using Tapatalk Pro
Is there any tests to confirm its the charging port? Ohm out the pins? I just bought a new battery ($70) and it didn't solve the problem. The ports are $60. I could buy a new Nexus for the price of these components.
I have a 2012 Nexus 7 with suddenly occurring erratic battery behavior. Sometimes, it drains slowly while charging in sleep mode or completely off. I have a Watt meter connected to the charger. Here are the results:
Powered off - 0 W
Sleep - 2.4 W that drops to 1.2 W in five minuets, then to 0
Powered on, battery 50% - 2.6 W
The charging graph shows two very different charging rates. The fast rate charge occurs very infrequently. The slow rate would take 2 or 4 days to charge the battery.
At first I suspected the battery, but why would I get occasional normal battery behavior. Then I suspected an intermittent connector issue, but I am starting to rule that out. Now I am suspecting the "smart" charging firmware or a software issue. I have eliminate all the usually suspected power draining functions. I have tried several chargers including the 2A.
Just today, it will not turn on and the charger using 0 Watts.
Can anyone let me know how many Watts a normal Nexus 7 uses while charging under different conditions? I'd guess it to be at 5 to 10 Watts.
I have a 2012 Nexus 7 with suddenly occurring erratic battery behavior. Sometimes, it drains slowly while charging in sleep mode or completely off. I have a Watt meter connected to the charger. Here are the results:
Powered off - 0 W
Sleep - 2.4 W that drops to 1.2 W in five minuets, then to 0
Powered on, battery 50% - 2.6 W
The charging graph shows two very different charging rates. The fast rate charge occurs very infrequently. The slow rate would take 2 or 4 days to charge the battery.
At first I suspected the battery, but why would I get occasional normal battery behavior. Then I suspected an intermittent connector issue, but I am starting to rule that out. Now I am suspecting the "smart" charging firmware or a software issue. I have eliminate all the usually suspected power draining functions. I have tried several chargers including the 2A.
Just today, it will not turn on and the charger using 0 Watts.
Can anyone let me know how many Watts a normal Nexus 7 uses while charging under different conditions? I'd guess it to be at 5 to 10 Watts.
preppystud
Well-known member
- Jan 10, 2013
- 461
- 0
- 16
install apps such as battery doctor or something similar.
use it, it will show you all the apps that are running. you can close all of them.
then try to charge it again. maybe that will help.
use it, it will show you all the apps that are running. you can close all of them.
then try to charge it again. maybe that will help.
I assume by "uses" you mean how much power does a power supply provide while actively charging. If that is the case the number, I have hear are around 6 watts (5V X 1.2 amps), so right in your range.
Thanks for posting the video. I ordered the USB port and headphone port and installed it and my Nexus turned on and is now charging. Thanks again for your help! You saved me a lot of money and time not having to send it out to get it fixed. The video was great too because it was very easy to see what I needed to do.
Good info, thanks. My old model Nexus 7 has been slow charging or even discharging when plugged in, and nothing external has worked (chargers, cables, etc.).
Have you gotten any replies from anyone that this fix is working for them? I am willing to break the case open and try it, but would like to do so only if it looks like this is the common repair, instead of possibly just for your unit.
Larry
Have you gotten any replies from anyone that this fix is working for them? I am willing to break the case open and try it, but would like to do so only if it looks like this is the common repair, instead of possibly just for your unit.
Larry
Just because a charger is rated for 1350 mA does not mean it will source that. It may source that into a zero volt load, but it is probably not going to source 1350mA at 5V into something that is at 4.99V. So, your math doesn't apply to charging times.
If the charger cannot in fact supply the rated VA output you need to have it out with the vendor.
It's a fallacious reasoning as evidenced by PC PSU testing. If you cannot get the amps and volts on the package you need to act on it. If I buy a 2.1A wall wart I fully expect 5v/2A for thirty minutes minimum. Most devices will not use that much power for that long unless you're trying to game on them while charging.
An example from my laptop. It had a 35W APU (package max 65W) and a 25W GPU (package max 45W), and a very solid 120W output rated supply. With my overclocked settings it has a max draw of 80W total system power, and from less than 10% charge the battery pulls 38.75W; I have plugged in at 9% charge while playing Battlefield 3 (75W avg drain) and still achieved 100% battery in 1.5hrs. No slow charging and no thermal trip in the adapter.
If your wall wart cannot achieve a measly 8W you should break it with a hammer and bury it, then go order a reputable model to replace it.
It's a fallacious reasoning as evidenced by PC PSU testing. If you cannot get the amps and volts on the package you need to act on it. If I buy a 2.1A wall wart I fully expect 5v/2A for thirty minutes minimum. Most devices will not use that much power for that long unless you're trying to game on them while charging.
An example from my laptop. It had a 35W APU (package max 65W) and a 25W GPU (package max 45W), and a very solid 120W output rated supply. With my overclocked settings it has a max draw of 80W total system power, and from less than 10% charge the battery pulls 38.75W; I have plugged in at 9% charge while playing Battlefield 3 (75W avg drain) and still achieved 100% battery in 1.5hrs. No slow charging and no thermal trip in the adapter.
If your wall wart cannot achieve a measly 8W you should break it with a hammer and bury it, then go order a reputable model to replace it.
GSDer
Well-known member
- Jan 30, 2011
- 8,469
- 15
- 0
Would you care to provide some numbers that are accurate?
Sent from my rooted, debloated, deodexed Sinclair ZX-80 running CM -0.001 using Tapatalk
By easy comparison a N7 2013 should fully charge in less than four hours, possibly less than three. For some reason some of them are consistently pulling just under the 500mA hard limit of classic USB and USB 2. This easily brings the charge time to about four times as long, as much as more than 12 hours. Easy math and nothing to do with rated output.
If the wall wart is rated 1350 and your max draw is 430 your charge time will be FOUR TIMES as long with the device on and about 2.5 times as long with it off, roughly. Compared to the expected charge time at 1350. And with barely two watts available in a device that easily may use more than three, yes you can lose charge while 'charging'.
If the wall wart is rated 1350 and your max draw is 430 your charge time will be FOUR TIMES as long with the device on and about 2.5 times as long with it off, roughly. Compared to the expected charge time at 1350. And with barely two watts available in a device that easily may use more than three, yes you can lose charge while 'charging'.
I do not have a Nexus 7 but came across this thread while troubleshooting some android phone charging issues and thought I would add my two cents.
The phone doesn't know the rated amperage of the wall wart, it can only do two things: 1) test the voltage on the data pins for a charger 'signature' or 2) see if the power (5v) line drops under the load. For android, the charger 'signature' is typically shorting out the data pins (just connecting them together). For iOS devices, the 'signature' is (around) 2.8v and 2.0v on the data pins. This is why sometimes specialty chargers will work for some devices and not others, or why USB chargers have ports designed for different devices. A simple test, if you have a spare cable to dissect, is to create a 'charging cable' out of it to charge the phone by splicing the data wires together. This is a hacked solution, but could be useful if you are like me and have a plethora of old junk cables. If it charges at full speed with that then you have a charger that isn't shorting the data lines.
Another possibility is battery drain. As everyone mentions, you may be running apps or services in the background which may be taking a significant toll on your battery. This typically isn't the case, and you can easily tell because the device will likely have a warm spot and the charger would be warm. Different kernels may induce this but it is definitely possible to just be draining the battery too fast. have had my Nexus 5 charge slowly and discharge in ~30 minute cycles. I have to assume a hardware/kernel problem that is infuriating, but solved on reboot.
Another possibility is faulty hardware. Batteries are very temperamental and the hardware charging circuit may think there is a problem with the battery and so it tries to charge it slowly. Charging batteries fast wears out batteries. I'm not as confident on this one, but it might be a problem. You can try switching devices with someone for a day, or taking it to the store to see if your device is faulty.
Another thought is, as mentioned previously, the cable to the device is a high gauge (and high resistance) making the phone think the charger is struggling to keep up with the load because it doesn't read a full 5v on the power line. Try a different cable.
The phone doesn't know the rated amperage of the wall wart, it can only do two things: 1) test the voltage on the data pins for a charger 'signature' or 2) see if the power (5v) line drops under the load. For android, the charger 'signature' is typically shorting out the data pins (just connecting them together). For iOS devices, the 'signature' is (around) 2.8v and 2.0v on the data pins. This is why sometimes specialty chargers will work for some devices and not others, or why USB chargers have ports designed for different devices. A simple test, if you have a spare cable to dissect, is to create a 'charging cable' out of it to charge the phone by splicing the data wires together. This is a hacked solution, but could be useful if you are like me and have a plethora of old junk cables. If it charges at full speed with that then you have a charger that isn't shorting the data lines.
Another possibility is battery drain. As everyone mentions, you may be running apps or services in the background which may be taking a significant toll on your battery. This typically isn't the case, and you can easily tell because the device will likely have a warm spot and the charger would be warm. Different kernels may induce this but it is definitely possible to just be draining the battery too fast. have had my Nexus 5 charge slowly and discharge in ~30 minute cycles. I have to assume a hardware/kernel problem that is infuriating, but solved on reboot.
Another possibility is faulty hardware. Batteries are very temperamental and the hardware charging circuit may think there is a problem with the battery and so it tries to charge it slowly. Charging batteries fast wears out batteries. I'm not as confident on this one, but it might be a problem. You can try switching devices with someone for a day, or taking it to the store to see if your device is faulty.
Another thought is, as mentioned previously, the cable to the device is a high gauge (and high resistance) making the phone think the charger is struggling to keep up with the load because it doesn't read a full 5v on the power line. Try a different cable.
recently was not charging overnight. cable to N7 connection seems loose/sloppy.Tried most of the suggestions above. Watching battery charging in settings or a battery application. I could hold the connection "just right" for a charge. Propping between some desk objects for a longer time period, worked somewhat. Bought a wireless charger...PROBLEM SOLVED!.. I got one that will cradle the N7 in LANDSCAPE.
Re: extremely slow charging, any fixes?
I have the same problem with mine. And my sister had the same problem with her's. I'm looking into your suggestion to make sure all apps are closed
As for the tablet itself, it also has another problem concerning the charge port. My sister and my Nexus 7 ( Asus ) the plug doesn't seem to be as tight a connection as it should be. You have to move the plug around a bit to get a battery symbol indicating it's charging. Her's has now given out. It won't do anything, nor will it power up.
I purchased mine used and knew that it has a potential problem, but the guy I bought it from said it was fine.
Perhaps engineering didn't spend enough time on the charging system.
I have the same problem with mine. And my sister had the same problem with her's. I'm looking into your suggestion to make sure all apps are closed
As for the tablet itself, it also has another problem concerning the charge port. My sister and my Nexus 7 ( Asus ) the plug doesn't seem to be as tight a connection as it should be. You have to move the plug around a bit to get a battery symbol indicating it's charging. Her's has now given out. It won't do anything, nor will it power up.
I purchased mine used and knew that it has a potential problem, but the guy I bought it from said it was fine.
Perhaps engineering didn't spend enough time on the charging system.
Similar threads
Trending Posts
-
Question Looking for an Android tablet that wont show any icons whilst screen mirroring over USB/HDMI
- Started by mikey2017
- Replies: 1
-
-
One UI 7, and just updates in general - why consistently remove useful features??
- Started by Rev1010
- Replies: 27
-
News Max is ditching the rebrand and going back to HBO Max- Started by AC News
- Replies: 1
-
News Tech Talk: More than you ever wanted to know about malware
- Started by AC News
- Replies: 0
Facebook
Twitter
Instagram