Does Nexus 7 run directly from USB or charger power when connected to USB cable? Or is it so that the device continues to run on battery while the battery is simultaneously being charged? This is an issue related to the longevity of the battery. The easiest way to test this is to try and run the device on DC power while the battery has been removed. I have neither the tools nor the guts to check this out. Suggestions from anyone and everyone are welcome.
Tablet won't turn on without battery while being plugged in/charged, I tried it.
Sent from my Galaxy Nexus using xda app-developers app
thanks
Kuchar09 said:
Tablet won't turn on without battery while being plugged in/charged, I tried it.
Sent from my Galaxy Nexus using xda app-developers app
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and if we remove the battery while the tablet is running? (obviously while plugged in)
dmmbbs said:
and if we remove the battery while the tablet is running? (obviously while plugged in)
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Humm... Interesting, it stayed on. If i restart without a battery it will actually restart to the home screen but then restart if u try to click on anything.
So I guess ignore my first post, these are different results then I got a month ago.
Sent from my Galaxy Nexus using xda app-developers app
Settings-->Battery
Kuchar09 said:
Humm... Interesting, it stayed on. If i restart without a battery it will actually restart to the home screen but then restart if u try to click on anything.
So I guess ignore my first post, these are different results then I got a month ago.
Sent from my Galaxy Nexus using xda app-developers app
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Battery settings shows "X" seconds on battery and that X never changes if the tablet is connected(to PC/charger), no matter what you are doing. I connected the tablet to PC front panel USB, switched it on, it showed 100% charged and 0s on battery. Now I fired up Stability Test and after an hour or so battery settings showed 95% charging, 0s on battery. Your and my findings establish a point, i.e. The USB power provides direct power to the tablet upto a certain wattage, beyond which- as in case of a demanding load- the battery also/solely provides power. The battery is always being charged in background if it is not already fully charged.
Related
Strange Issue!!
when my phone is low on battery and i try to charge it (with the original ac charger or the usb); sometimes (almost half the times) the phone instead of charging .... DISCHARGES!!
i have tried all possible fixes. tried the battery calibration apps also. but it gets ok for a day and then back.
i can only charge my phone while its switched off!
Details:
1. on stock TW4
2. 3 pages on home
3. total widgets= 6 ( advanced task killer; digital clock; 2- circle launcher; quick battery; weather)
4. i kill all tasks always before charging!
WHAT AM I DOING WRONG? BTW I HAVE TRIED TO REMOVE ALL WIDGETS AND CHARGE ALSO! NO LUCK!
HELP!!
It sound like you might have a faulty charger, have you tried charging from your notebook, it`s a bit slower at 400mah compared to 650mah for the mains charger.
Tinderbox (UK) said:
It sound like you might have a faulty charger, have you tried charging from your notebook, it`s a bit slower at 400mah compared to 650mah for the mains charger.
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Yes, as a matter of fact, right now i am trying to charge through USB with the same drainage.
Switch the phone off for a while!... let the sucker charge.
And the problem is not always!
this is normal, already been posted. the charger is limited to 650 mA on wall power, and 450 mA on USB power. so it is easily possible to pull more power than is going into the device, say if you are gaming or pushing the device hard with navigation or similar.
next time this happens, turn off the screen for 10 minutes as a test, then come back, and see if the charge increased at all. it likely will increase.
RogerPodacter said:
this is normal, already been posted. the charger is limited to 650 mA on wall power, and 450 mA on USB power. so it is easily possible to pull more power than is going into the device, say if you are gaming or pushing the device hard with navigation or similar.
next time this happens, turn off the screen for 10 minutes as a test, then come back, and see if the charge increased at all. it likely will increase.
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yup! i was having the same problem and did this Roger says and its exactly that... GL
if your phone is hot too it will not charge as well.
RogerPodacter said:
this is normal, already been posted. the charger is limited to 650 mA on wall power, and 450 mA on USB power. so it is easily possible to pull more power than is going into the device, say if you are gaming or pushing the device hard with navigation or similar.
next time this happens, turn off the screen for 10 minutes as a test, then come back, and see if the charge increased at all. it likely will increase.
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My problem is when I'm not using the phone at all and the screen is off. Tried charging through both wall and usb charger.
The only way right now I can charge my phone is while switched off.
I always kill all apps before charging also... Still!
And if its charging while on, screen off, it gets hot also.
Sent from my GT-I9100 using XDA Premium App
vinaymieux said:
My problem is when I'm not using the phone at all and the screen is off. Tried charging through both wall and usb charger.
The only way right now I can charge my phone is while switched off.
I always kill all apps before charging also... Still!
And if its charging while on, screen off, it gets hot also.
Edit: i also have read in many places that using task killer actually cause more harm than good bcoz it disturbs the proper sequece of how android shuts down an app or process..and cleans up the memory..this will result some of the apps or process to stay awake or come awake again when it sould be sleeping...
Sent from my GT-I9100 using XDA Premium App
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I once had this problem..after charging for 6 hours battery was only at 60% and phone was hot..found out that although the screen was off..the phone was wide awake all the time. For me the issue was the wifi manager was somehow awake and consuming power..hence phone was hot and battery drain while charging. Check your battery usage graph and see if your phone is awake when it should not be..and pin down the rouge app or process..
Hope this helps..
Sent from my GT-I9100 using Tapatalk
I've got a similar problem, while charging in a car using the SGS2 for navigation. BTW, what is the maximum Amper I can charge the phone without damaging it?
I really dont understand why Samsung keeps supplying this crappy charger. Desire Z and iPhone 4 both came with 1000mAh ones. Super fast charge on both! Come on sammy... This isnt a 900mAh feature phone. This is a big battery hogger dual core with a large battery inside!
Sent from my GT-I9100 using XDA App
SkulleD_PT said:
I really dont understand why Samsung keeps supplying this crappy charger. Desire Z and iPhone 4 both came with 1000mAh ones. Super fast charge on both! Come on sammy... This isnt a 900mAh feature phone. This is a big battery hogger dual core with a large battery inside!
Sent from my GT-I9100 using XDA App
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I am using HTC's 1000mA charger and still,this happens to some extent,only much less.Try overclocking the hell out of it and then start benchmarking.Charging?Hell no.You may even need to draw power from the house next to yours!
SkulleD_PT said:
I really dont understand why Samsung keeps supplying this crappy charger. Desire Z and iPhone 4 both came with 1000mAh ones. Super fast charge on both! Come on sammy... This isnt a 900mAh feature phone. This is a big battery hogger dual core with a large battery inside!
Sent from my GT-I9100 using XDA App
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I read somewhre in this forum that samsung has set a limit of max amperage on this device to below 700 miliamp( cant remember the exact value for ac charging and usb charging) so thts why the charger is rated to 700mah
Sent from my GT-I9100 using Tapatalk
iznee said:
I read somewhre in this forum that samsung has set a limit of max amperage on this device to below 700 miliamp( cant remember the exact value for ac charging and usb charging) so thts why the charger is rated to 700mah
Sent from my GT-I9100 using Tapatalk
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That's right,but if the charger was 1000mA like HTC's it would continue to draw those 700mA it needs even while in use.You wouldn't notice any difference at all with it charging while not being used,but when screen is on there is a difference.
They limited charge current to 650 mA in the driver code, so that's why they use a 0.7 A charger. Using a higher output won't help unless someone compiles a new kernel.
I charge the phone until 100%. When unplug, it immediately drops to 85%-90%. On one occassions, it dropped to 40%! What's wrong with it?
iCatchU said:
I charge the phone until 100%. When unplug, it immediately drops to 85%-90%. On one occassions, it dropped to 40%! What's wrong with it?
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As i posted before...something is always awake on your phone..try looking at your battery graph..and i am sure your device is quiet warm..
Sent from my GT-I9100 using Tapatalk
iznee said:
As i posted before...something is always awake on your phone..try looking at your battery graph..and i am sure your device is quiet warm..
Sent from my GT-I9100 using Tapatalk
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Thanks. But...i tried charging it whilst it was turned off. The icon showed 100%. I then unplug and switched it on. The same happened. So, it should not be Apps related. Right?
iCatchU said:
Thanks. But...i tried charging it whilst it was turned off. The icon showed 100%. I then unplug and switched it on. The same happened. So, it should not be Apps related. Right?
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I suggest you do a simple trouble shooting...charge your phone to 100% while it is off.
Than unplug, switch on your phone and just leave it for half hour or an hour without doing anything.
Than swith your display on...and go to settings
Select about phone..
Go to battery use and tap on the graph.
It will show you a few horizontal lines.
Make sure your screen on and awake time bars coincide nicely.
While your screen is off your awake bar should be very very minumum... most of the high battery drain casses will have a very short screen on bar but a solid long line of awake time.
This is normally due to some rougue app or process...and you have to narrow it down.
If your graph looks normal..than you could be having a defective battery or in worst case a defective hardware.
Sent from my GT-I9100 using Tapatalk
The max of 0.7 amps is a partykiller... When in my car, I'd like to have my phone record everything (dailyroads voyager as dashcam), while navigating... Definitely discharging there while on stock carcharger! So I will have to choose when I'm going on holiday (12 hours drive...)
Sent from my GT-I9100 using XDA App
I had a same problem before. But after I reflash 2-3 times (literom 1.5 for now) it's gone, and charging normal on car and wall charger while gaming or navigate.
Does it happen to you guys?? It happened once, now it is happening again. Although I'm charging it, it doesn't turn on. Do you think my device is defective?
Sent from my GT-I9300 using xda app-developers app
In my experience with Tablet like devices (such as the nook) when you let your device get so low on power it shuts itself off it can take quite a while before it'll turn itself back on, even when using the proper cables and chargers. I imagine this has to do with the fact the software wants to make sure there's enough power in the device to stop it from immediately shutting off again.
I've also seen this in my phone where when it shuts off it won't properly turn back on until it meets a certain charging percentage (unless I'm unplugging it, powering it on after it has a little juice and plugging it back in)
edgarzin said:
Does it happen to you guys?? It happened once, now it is happening again. Although I'm charging it, it doesn't turn on. Do you think my device is defective?
Sent from my GT-I9300 using xda app-developers app
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i believe ur charger might be defective....happened to me once nd it was due to the charger......not giving enough power to boot up the tab...i.e tablet discharging quicker than charging...
When I wanted to check the status of my tablet, it decided to shut down with the warning that the battery was empty, but it was in the charger.
Now; it refuses to charge, only blinking the LED with little to no strength at all.
Might it be that the battery has been discharged completely, even though it was and is in the charger?
Is it cold in your room? Try to warm the device with fan heater or put it in front of the air conditioner to warm it up. Its a known problem of Gen8 devices. If its not the problem I'm clueless.
Mavasilisk said:
Is it cold in your room? Try to warm the device with fan heater or put it in front of the air conditioner to warm it up. Its a known problem of Gen8 devices. If its not the problem I'm clueless.
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Hmm, as far as i know it's on room-temperature. I'll try the heating trick.
eymas said:
Hmm, as far as i know it's on room-temperature. I'll try the heating trick.
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How many time have you let the tab on sector?
When my tab was completly discharged, i had let it more than 1 hour on sector. Blink is back and after some minutes
Bizcuite
Sent from my GT-N7100 using xda app-developers app
bizcuite said:
How many time have you let the tab on sector?
When my tab was completly discharged, i had let it more than 1 hour on sector. Blink is back and after some minutes
Bizcuite
Sent from my GT-N7100 using xda app-developers app
---------- Post added at 02:12 PM ---------- Previous post was at 02:11 PM ----------
Sent from my GT-N7100 using xda app-developers app
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It used to be in the USB port of my second display(Powered USB hub) for about two hours or more. afterwards i used a wall outlet charger for an hour.
eymas said:
It used to be in the USB port of my second display(Powered USB hub) for about two hours or more. afterwards i used a wall outlet charger for an hour.
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Only used the adapter sector charger to charge the tab correctly.
My tab can be charged by computer USB port, they haven't the power required to charge the tab.
Try to connect the tab during 2 hours.
Bizcuite
As far as I know Gen8 cant be powered by USB. The output is too low. Anyway if its completely exhausted try to leave it on the wall for 1-2 hours.
Mavasilisk said:
As far as I know Gen8 cant be powered by USB. The output is too low. Anyway if its completely exhausted try to leave it on the wall for 1-2 hours.
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A70s2 can be powered by usb
Biuzcuite
Sent from my Nexus 4 using xda app-developers app
Its not like his device.
Mavasilisk said:
Its not like his device.
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eymas said:
It used to be in the USB port of my second display(Powered USB hub)
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I speak about adapter Sector charger (110V/220V depend of your location).
He uses USB ports to charge his tab. He must use the charger gives by Archos, not others one.
Bizcuite
eymas said:
When I wanted to check the status of my tablet, it decided to shut down with the warning that the battery was empty, but it was in the charger.
Now; it refuses to charge, only blinking the LED with little to no strength at all.
Might it be that the battery has been discharged completely, even though it was and is in the charger?
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Click to collapse
It could be that the battery is dead. Nothing visual to see at your A43? In my experience when the battery brakes it blowes up a little, you should see some gaps or a bolded back. I had that with one battery of my 101 luckily the 101 has two so I removed the defective one.
@Mavasilisk a43 should be able to be powered from standard usb. However you need a "working" battery else it won't start. By working I mean it needs to supply a minimal voltage to the hardware. So you cannot just remove the battery and power it with only usb. Atleast this is the case with my old gen5 (605), gen7 (a5it) and my gen8 (a101it)
divx118
divx118 said:
It could be that the battery is dead. Nothing visual to see at your A43? In my experience when the battery brakes it blowes up a little, you should see some gaps or a bolded back. I had that with one battery of my 101 luckily the 101 has two so I removed the defective one.
divx118
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When i had put on the tab, a bad initramfs, my tab hasn't any sign of life (no reset by button when it was powered on, hold on first Archos screen, and after full discharge. no blink, no power, nothing).
I had just connect the tab during 2 hours at home, and it was ok after that.I hope that your battery is not dead like Divx118 has say....
Bizcuite
bizcuite said:
When i had put on the tab, a bad initramfs, my tab hasn't any sign of life (no reset by button when it was powered on, hold on first Archos screen, and after full discharge. no blink, no power, nothing).
I had just connect the tab during 2 hours at home, and it was ok after that.I hope that your battery is not dead like Divx118 has say....
Bizcuite
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I do not see any deforming, so a blown battery couldn't be the case(hopefully).
Let's see if the USB charger will work (400ma)
eymas said:
I do not see any deforming, so a blown battery couldn't be the case(hopefully).
Let's see if the USB charger will work (400ma)
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Is it original charger? Mine is a 5v for 1.5a max.
Bizcuite
Sent from my GT-N7100 using xda app-developers app
bizcuite said:
Is it original charger? Mine is a 5v for 1.5a max.
Bizcuite
Sent from my GT-N7100 using xda app-developers app
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I didn't get any charger with my tab
eymas said:
I didn't get any charger with my tab
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Ok so i have it in the charger since 17:00. its 21:00 now, and it is still dead...
Good thing I'm getting a new phone soon :l
I've had my Nexus 4 for about 2 weeks now and currently it is taking a ridiculously long time to charge. It has been hooked up with the original USB to Micro-USB cable for about 3 hours at it went from 12% to 8% (wtf...) to 10% now and hasn't moved for the past hour. Someone help please
Try charging it from another charger it or a PC. Sounds like your charger is probably faulty.
Sent from my Nexus 4
steviewevie said:
Try charging it from another charger it or a PC. Sounds like your charger is probably faulty.
Sent from my Nexus 4
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Thanks for the reply, I switched USBs and it is not going any faster
Reboot
Sent from my Nexus 4 using xda premium
When you say you switched USBs, you mean a different charger?
Sent from my Nexus 4
steviewevie said:
When you say you switched USBs, you mean a different charger?
Sent from my Nexus 4
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Yea
i've got the same issue.
reset the phone may help.
Yeah you could try a factory reset. Failing that, re-flash the stock ROM. Failing that, RMA it.
Sent from my Nexus 4
steviewevie said:
Yeah you could try a factory reset. Failing that, re-flash the stock ROM. Failing that, RMA it.
Sent from my Nexus 4
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I'm not entirely sure wether this is a "good" answer but are you charging by USB meaning plugged in your computer or laptop?
Because I've had it with several phones that if you put it in your laptop it doesn't charge or very very slowly. In the PC it goes faster but not as fast as straight from the wall.
Try plugging the charger in a wallplug, see if that helps? And also if you really want to charge by PC, flash a kernel (see Franco's thread) and put it on "Fast charge USB", then it should go at the same speed as wallcharged. (dunno how on stock rom)
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If you meant that you've charged by plugging it into the wall in OP, then I'm sorry, I don't know Or just a faulty charger.
Daydream
disable daydream (while charging)
This also happens to me and I found out that when I plug my phone wall charger, in the battery menu it shows that the phone is charging using "USB" instead of“AC".....any help?
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shinewithme said:
This also happens to me and I found out that when I plug my phone wall charger, in the battery menu it shows that the phone is charging using "USB" instead of“AC".....any help?
Sent from my Nexus 4 using xda app-developers app
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Do you have a custom kernel installed? Maybe there is a faulty setting in there. Worst case scenario is RMA, but try having the phone plugged in and then power the phone down. Once it's off, press the power button (don't hold it) and see if a battery animation comes up. If it does, then keep it plugged in for a few hours and see if it charges any faster...
try a different cable. For me, the cable went bad. when connected to the oem wall wart, my phone would sometimes be charging USB, sometimes A/C. After changing the cable (not the wart), always charges A/C now.
Install a battery utility and verify how much current it is drawing.
Run on Nexus swampy 2 game. Connect charging.
Nexus discharge. USB cable and charge tested on sgs4 in " heavy " mode.
Exit from game. To ensure kill game process through sh.
Tablet continues to discharge when connected to the charger .
Turn off your device , turn on. Still goes discharge.
When charges complete with Nexus turn off then the situation is corrected .
Tablet perfectly now holds a charge and charging normally.
I can't find any explanation. May be the game turn on something in GPU and even restart does not help.
But why after full charging problem gone?
Tried to change the kernel to franco - did not help.
svs57 said:
Run on Nexus swampy 2 game. Connect charging.
Nexus discharge. USB cable and charge tested on sgs4 in " heavy " mode.
Exit from game. To ensure kill game process through sh.
Tablet continues to discharge when connected to the charger .
Turn off your device , turn on. Still goes discharge.
When charges complete with Nexus turn off then the situation is corrected .
Tablet perfectly now holds a charge and charging normally.
I can't find any explanation. May be the game turn on something in GPU and even restart does not help.
But why after full charging problem gone?
Tried to change the kernel to franco - did not help.
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Not sure exactly what's wrong in your situation but the n7 is plagued by charging problems. They seem to very easily stop using the full 2amp capacity of the charger and drop to about 500mA(less power than the nexus uses during high power activities) some people have reported holding a soldering iron to the USB connection fixes it
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Captain Sweatpants said:
Not sure exactly what's wrong in your situation but the n7 is plagued by charging problems. They seem to very easily stop using the full 2amp capacity of the charger and drop to about 500mA(less power than the nexus uses during high power activities) some people have reported holding a soldering iron to the USB connection fixes it
Sent from my C5303 using xda app-developers app
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Thank you for answer. I use 2A charger. The problem is
why nexus dischage with connected 2A charger when I stop/kill game that eat battery.