Battery Shot? - Nexus 7 Q&A, Help & Troubleshooting

So I have an trying to repair a first gen Nexus 7 that don't charge or turn on.. However this one is a little bit different from the other.
I pull the battery from another N7 (which I have previously changed the screen on, so no warranty anyway) and plug into the unit. The unit boot as normal.. I plug in charger after it booted up. and all is good and charging.. So the unit and charger plug is all working.
The weird part is that the dead battery does have a 3.4v charge in it. From experience this non charge issue only occur when there are absolute no charge left in the battery.. (0v).. but this one have 3.4v which should at least give power to boot a bit for charging.. so any suggestion? Or as I am thinking the battery could be dead? But why it is giving 3.4v?

Related

Wizard won´t recharge!

Hi,
My wizard run out of battery completly yesterday, I brought it home and try to recharge it, but no recharging light will appear.
I left it overnight connected to the mains but to no appeal,
I also removed the battery for a few minutes and then plug again but no luck.
I´m not using the mains provided adaptor but my travelling kit, a proporta mains/usb adaptor and a retractable sync/charge cable with a mini-usb pin cos I´m back home for Xmas and I don´t travel with the mains.
I have read about problems with some chargers from Boxwave, but I have consistently using this charging conbination since October.
Any ideas, should I send it back to expansys to repair, or is there anything else I can try?
Thanks
Elsral
same thing happened to me.. Supposely the phone will not charge from being completely dead without a charger that puts out 1amp. There is another method if you are a little brave... cut up an old car charger and hook it directly to the battery (red cord to + on battery and black to -) Read about it on howardforums and it worked like a champ. I only needed to jump the battery for about 30 seconds before I put it back in the phone and the amber light kicked on.. I was very relieved!!
Same happend to me yesterday. Simply plug the carger in and wait 1 or 2 seconds then switch the power button. After some seconds the carging light should switch on.
The wizard won't charge if it's switched off.
Export800,
you are a megastar,
I put apart a usb adaptor that I had built to charge my gps and I connected cables directly to battery for a minute and Voile,
tnx a million,
elsral
Xunil99 said:
Same happend to me yesterday. Simply plug the carger in and wait 1 or 2 seconds then switch the power button. After some seconds the carging light should switch on.
The wizard won't charge if it's switched off.
Click to expand...
Click to collapse
But if the battery is totally dead surely the unit wont switch on ? Thus its a catch 22 ??? There is no power to switch on and the battery wont charge totally dead.
Ridiculous if you were caught out away from a charger and ended up having to pull apart a usb lead to get things back to life.
If the battery is so low, that the wizard switches off itself, and you connect the charger, it won't charge, because it's switched off.
Use the power of the charger to turn it on, then charging will beginn (and also the device will boot).
Xunil99 said:
If the battery is so low, that the wizard switches off itself, and you connect the charger, it won't charge, because it's switched off.
Use the power of the charger to turn it on, then charging will beginn (and also the device will boot).
Click to expand...
Click to collapse
Can anyone else confirm this works as there have been many people having this problem. Simple solution if it works.
Switch off your device completely (hold the Power Button) and try to charge: Nothing happens. Now switch it on - charging begins.
I have noticed that last week, when battery was very low and i know that i would need my wizard in about half an hour. So i switched it off completely, so that it would charge faster and noticed that.
Yesterday when battery was totally dead i remembered that and i switched it on.
Btw, doesn't it damage the battery, if you connect it to 12 V (!!)??
Xunil99 said:
Switch off your device completely (hold the Power Button) and try to charge: Nothing happens. Now switch it on - charging begins.
I have noticed that last week, when battery was very low and i know that i would need my wizard in about half an hour. So i switched it off completely, so that it would charge faster and noticed that.
Yesterday when battery was totally dead i remembered that and i switched it on.
Btw, doesn't it damage the battery, if you connect it to 12 V (!!)??
Click to expand...
Click to collapse
If I come across the problem will certainly be trying your method before I will be ripping into any usb leads
The same thing happened to me this past weekend. We were out camping and my MDA's (wizard) battery went completely dead. I had a USB sync cable for my laptop, but that would not revive the unit. I'm afraid the only way to bring it back to life is with the original OEM charger which has an output of 1 amp. Thanks for the post!
I had the same issue a while back. At first I thought the moto charger I had was dead but then I plugged in a old SMT5600 and it worked fine.
I left it plugged into my computer for a hour or so and finally I heard the "new usb device blip" from the other room and it started to charge. Guess I was lucky.
Same thing happened with my wifes SMT5600. The battery died and she couldn't get it to charge with her moto mini usb charger. I plugged it into my machine and a hour later the charging light came on.
I have heard that the Wizard will not charge from my laptop using a usb cable if it is completely drain. I find this to be NOT TRUE.
I ran out of juice twice last weekend. The thing about the Wizard is that, if it's completely drained, it will get stuck at the boot screen, and go no further.
Take out the battery to turn it off again. Put the battery back in, and then plug in your charger. DO NOT TURN IT BACK ON. It needs all the power it can get. Give it a minute, and you will see your orange charge light come on. Just leave it alone for several hours, and it will charge. This is my experience.
I got it! But, first the story.
None of the above methods helped me. I tried plugging it in to a big truck lighter, a pickup truck, even an ac adapter for my coleman cooler. Nothing!
However, I had a powered Pro-Clip mount that I had as a backup for the one I use. Guess what? THAT worked!
I think the cable makes the difference. Need to find the specs on those puppies. LOL
Thanks for the help.

Dead Wizard?

Hi everyone. I've made the error of letting my Wizard get to 0% battery charge... so, when I tried to charge it up, no deal. I read around why, and I understood how this phone charges the battery: ok, no big deal. I followed a couple of posts here, on how to revive the Wizard. I used a 9V battery to let it boot... and it booted! But the battery never kept charge... well, I dunno: the battery status screen showed some percentages, but to be honest it never kept charge, or I had already fried the phone, thus the battery didn't get any charge/the phone couldn't start.
Then I got smarter, I read that a spare battery and the original wall charger would've been better... I took another battery, I attached its 1A wall charger... red blinking led, which sometimes stops blinking.
I fried the mainboard, didn't I ? I'm starting to think that 9V is a lil bit too much.
UPDATE EDIT: Well, I've done some electronic necromancy... the two batteries I had won't charge. I've managed to piggy back them with a power supply, they can boot the phone. Whee. Then I plug in the original wall charger, and... after 5-10 minutes, bang, power goes down. How much voltage do those batteries output after this little trick? 0.00, 0.01. Well, I just bought a new battery... but I still fear I might have fried something. I'm gonna charge one of those old batteries with the power supply and see what happens.
How to Recharge battery. When battery goto 0%
try this.. mine worked. Take a USB Cable cut the small end of the usb cable
not the side that goes to the computer. Strip the wire . all you need is the
red and the black wire. the rest fold it or cut it short. First : take the battery out of the phone. SECOND: Plug the usb to the computer ** becareful don't let the open wire touch each other it will shut your computer down or burn your usb port. THIRD ut the red wire to the + (positive ) and the black wire to the - (negative) on the battery for 1-3 minute. then put the battery back in the phone, turn it on , then plug your charger quickly. Hope this help you..
Thanks for the advice, goon1. I'm going to try this tomorrow, you'll have updates
The battery kept charge for like 10 minutes... then, bam, it's dead. It won't charge with the wall charger, it won't with the usb charger, nothing at all. I hope I just overloaded it and broke when I clumsly tried to reboot my phone, which I'll discover as soon as my new battery will get here from HK
that mean you have a bad battery. MADE IN CHINA. doesn't live up to it name.
the battery from there loose it charge quick. Remember they run 220 and we run 110. Just get a good battery from USA.
Batteries do wear out, and it shows when they wont hold their charge...
Before you conclude your phone is damaged, buy and try a new battery. ;-)
Peter
UPDATE
Since I didn't want to spend too much on a phone I consider bricked, I bought a 3$ battery from HK.
New, supposedly working... the red led is watching me.
Another detail: the power button does not work. In the rare cases where the phone booted, pushing it to go in stand by didn't work.
I'm more and more convinced that I fried something.

SGS2 battery not being charged.

Hello,
Today there went somthing wrogn with my sgs2. The battery is not being charged. I have tried few chargers but without success. Now it is powering up showing info the battery is over and turnes off. After few minutes it is again powering up and after few seconds powering off :/
I think I have to sent it to warranty service or is it any other way I can check it?
I'm not sure if it is battery problem or phone problem.
It started yesterday when my phone showed some strange message like it has been used in car (wheel icon on top).
Well guys this is totally weird.
It started charging properly when I connected it to USB cable from USB hub.
What I observed is that when battery is below 25% all the problems are happening and I cannot use normal charger. When I charge it above 30% then normal charger also begins to work without any problem.
Maybe it is software related?
It might be the 650ma limit for charging is messed up or your chargers are not meeting the requirements.
I voided my warranty and your mum.

Is your Nexus 7 stuck at 0% battery, even if its fully charged or has any charge?

I was reading that that a lot of you guys have issues with Android not displaying the real charge of the tablet and I was experiencing this issue for a while as well. In my case it was an easy fix, simply power off the tablet, carefully pry off the back, then disconnect the battery cable carefully (it's the cable coming from the big black thing on the bottom, google to find out where), finally hold the power button for about 10-15 seconds with the battery unplugged, this creates a static reset, using all of the electricity in the device and discharging it fully; it fixes all sorts of ****. Put it back together and you should be good to go.
It happened yesterday to my totally new nexus 7 16gb.
I charged it for about 8 hours while the tablet was turned OFF. When I turned it on it appeared to have 60% of battery... :-/
I reset the device and then again 60%..... So I charged it again and with no problem appearing, it charched untill 100%..
That happend only once, in its 3rd charge.
Any idea?
battery stuck at 0%
I was having this problem as well, my nexus was showing 0% battery. I took the back cover off and figured out that the battery cable was not pushed all the way into the socket. If anyone else is having this problem be sure to double check the battery cable is all the way in.
tmann80 said:
I was having this problem as well, my nexus was showing 0% battery. I took the back cover off and figured out that the battery cable was not pushed all the way into the socket. If anyone else is having this problem be sure to double check the battery cable is all the way in.
Click to expand...
Click to collapse
i experienced that too.switched off then after 5 hours of charging, the % was 54%. then i unplug the charger, remove the cable, unplug the 3pin . reinsert all the 3pin and cable, then continue charging. surprisingly, the charging the is quiet fast. so dont ever remove the cable from the charger. maybe there is something wrong with the asus charger
I am facing weird battery status..it shows me 0% in red danger zone even though fully charged, but after some hours status changes to normal remaining battery...I unable to understand how can I fix this...as I am not getting exact battery status...its now also showing 0 % with charger plugged....
Sent from my Nexus 7 using xda premium
worked great thanks
I found the black wires askew pushing them back in did the trick thanks!!
Nexus 7 2012 1st gen 0% battery but on battery settings says 2 days
tmann80 said:
I was having this problem as well, my nexus was showing 0% battery. I took the back cover off and figured out that the battery cable was not pushed all the way into the socket. If anyone else is having this problem be sure to double check the battery cable is all the way in.
Click to expand...
Click to collapse
I did this took battery cable out and reconnected but still showing 0% battery but it shows 2 days battery on battery settings and still wont let me update from 4.4.4 to L5.0.2

S3 neo charges extremely slowly if it does at all

So I let the phone get below 15% the other day and I plugged it into a charger from an older samsung device and continued browsing. Before I knew it the phone was at 0% and it just shut down. While still plugged in, the phone made a few attempts to boot up but at the end I had to get the battery out. After getting the battery in and plugging in the charger again the phone didn't show any signs of life. Like I hard bricked it. After a few desperate attempts the screen flashed and a few minutes later the phone booted up like it normally would (This happened while it was still plugged in). Now it just won't charge as quickly even with the fast charger. The phone normally gets pretty hot while charging, now it just stays cold.
NOTE: I had it charging trough the night with the old charger but it didn't go over 15%.
I am running Ressurection remix 20150714.
I think it's got something to do with the hardware, and if it does, would the warranty fix this?
Sp/\ce said:
So I let the phone get below 15% the other day and I plugged it into a charger from an older samsung device and continued browsing. Before I knew it the phone was at 0% and it just shut down. While still plugged in, the phone made a few attempts to boot up but at the end I had to get the battery out. After getting the battery in and plugging in the charger again the phone didn't show any signs of life. Like I hard bricked it. After a few desperate attempts the screen flashed and a few minutes later the phone booted up like it normally would (This happened while it was still plugged in). Now it just won't charge as quickly even with the fast charger. The phone normally gets pretty hot while charging, now it just stays cold.
NOTE: I had it charging trough the night with the old charger but it didn't go over 15%.
I am running Ressurection remix 20150714.
I think it's got something to do with the hardware, and if it does, would the warranty fix this?
Click to expand...
Click to collapse
That's really not normal if your phone don't get hot while charging
Try a different cable (maybe it charging too slow), buy a new charger or charge your phone on PC. Check if an app use much battery/CPU and check if the battery is swollen or try an another battery. Update your ROM version maybe it's a software bug or reflash it. If nothing solve the problem then maybe you need to clear the usb socket of your phone or it's maybe damanged . Be careful if you clear the usb socket!
Sorry for too much maybe's
Good luck :highfive:
I checked the port, it's pretty nasty but I doubt that's the problem. I'll try and clean it up with a toothpick or something.
Checked the CPU usage and apps and it all seems normal.
I'm not home currently, but I'll do a full reset and roll back to cm11 when I get back.
I've used a travel charger from an older device, an Alcatel charger which actually charged my phone and my factory charger. The factory charger works best for now but it still takes like 5 hours to charge. The phone took less than 2 hours before...
Anyway thanks for the help so far, I really appreciate it.
How much mA you get while charging with the original one? Check it via Gsam battery app
Downloaded it, here's what I got.
Gsam is alternative of Bbs, but with better gui. Look at my ss - I can saw mA of discharge and charge the battery. With stock battery Ive got around 750mA
Yesterday for whole night i kept the mobile for charging and it showed 8% charged i thought it charged up and removed the socket before I knew it the phone was at 0% and it just shut down. While still plugged in, the phone made a few attempts to boot up but at the end I had to get the battery out. After getting the battery in and plugging in the charger again the phone didn't show any signs of life. Like I hard bricked it. After a few desperate attempts the screen flashed and a few minutes later the phone showed the sign of charging but it ended up (This happened while it was still plugged in). Now it just won't charge as quickly even with the fast charger and it wont shows any sign of life.
NOTE: I charged for whole night but is charged to only 8%

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