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[Q] Battery or charger at fault?

I have a locked & unrooted WW TF700 & genuine dock on JB 4.2.1.
A week ago I started to notice an issue where the tab would constantly drain whilst it should have been asleep. Overnight it would loose ~30% instead of ~2%. I tried a few settings, but couldn't seem to solve it. I decided to do a factory reset because I haven't done one since I last upgraded to jelly bean. That appears to have cured that problem, but has created two more.
The first problem is that I can't seem to charge the tab over 81% when being charged directly. If I then plug it into a fully charged dock it will charge to 90% but no more, even with the charging cable in the dock.
The second problem is that the tab now decides to shut off at about 30% battery left. It won't shutdown as normal, just go blank and won't boot up again without being charged a little first. I have read threads about artificially overcharging the tab, but a symptom of that is the battery level will remain at 100% for hours before starting to drain normally. My tab won't charge to 100% and will start to drain immediately after removing the charging cable. Regardless I have tried to drain and recharge overnight with the tab both off and on but the tab won't charge past 76% overnight in either case. Restarting multiple times doesn't help at all.
For the first issue I started to suspect the charger may be at fault. This is because if I charge the tab directly, it will never get past 81%. However, if I then plug it into the freshly charged dock it will charge upto 90%. I understand that the dock will never charge the tab past 90%, unless it is plugged into the charger. Does it assume in my case that it isn't plugged in to a charger even when it is? I should mention I am using the original asus charger. Frustratingly I can't just use my phone charger to see if it solves the problem due to the 15v of the asus charger. I have noticed a slight hum/buzz coming from the charger but I can't be sure that it didn't do that before. I have had issues with the internal connections not be pushed together quite right before and getting no charge out of it, but 'clicking it together' a bit more firmly did the trick there.
Even with an overnight charge, plugged into the dock to get it to 90% I now get terrible battery life. Roughly 30mins per 10% juice. Previously I was getting around an hour per 10%.
Does anyone have an suggestions for me on how to eliminate the charger as a problem, or say doing another factory reset on a 'full charge'? The only other thing I can think of is to let it drain, give it enough charger to turn back on, then turn it off and leave it unplugged overnight (I saw it mentioned in another thread). I really appreciate any help you can give before I have to try the dreaded warranty route!

Try this with it undocked. Let the battery discharge to zero, and leave it 24 hours.
Then recharge it fully. This seems to cure the battery calibration memory issues.most us know how you get on.

Luckily I have located an Asus charger to borrow and hopefully find out if it is just my charger or not.
I also tried out CPU-Z and the battery is reporting as only having 7mV. I'm sure that can't be correct as my HOX+ is around 3500mV, and 7mV just couldn't power anything. I don't know if this is just CPU-Z issue with reporting correctly, or a clue that there is something not right with my battery? Has anyone else tried CPU-Z or know what the mV should be roughly, fully charged say?

Unfortunately a different charger didn't solve my issue :'(
I've posted a screenshot to show what is happening. I'll try draining the battery flat and leaving 24 hours to see what happens then. Luckily I still have two months left on warranty.
Pretty annoying because everything else the tablet does is fantastic. I replaced my laptop with it and use it daily for everything.
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD

Unfortunately things have become worse. I tried using the tab until it died (at around 50% battery this time...) and left for 24 hours as suggested. Unfortunately now I can't get the tab to turn on or take a charge at all. I have tried holding power button down, with vol up/down, for over a minute etc. Tried the reset button all numerous times with no luck. All I get is the LED blink twice when pressing the power button and this only happens when the charger is connected, otherwise nothing.
I have the phone number for Asus support and will be giving them a call tomorrow. I'm so glad I never unlocked my device!

Gudders said:
Unfortunately things have become worse. I tried using the tab until it died (at around 50% battery this time...) and left for 24 hours as suggested. Unfortunately now I can't get the tab to turn on or take a charge at all. I have tried holding power button down, with vol up/down, for over a minute etc. Tried the reset button all numerous times with no luck. All I get is the LED blink twice when pressing the power button and this only happens when the charger is connected, otherwise nothing.
I have the phone number for Asus support and will be giving them a call tomorrow. I'm so glad I never unlocked my device!
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Leave it for 24 hours not on charge first then try again. We've seen this happen so many times - the fix is to let it discharge completely.

sbdags said:
Leave it for 24 hours not on charge first then try again. We've seen this happen so many times - the fix is to let it discharge completely.
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Thanks Sbdags, I appreciate your response. I've read numerous threads tonight with similar issues. I did try leaving the tab for 24 hours completely dead overnight last night. I'll try it again (I don't know if the battery is dead or not currently) but I'll leave it unplugged as there is nothing else for me to do with it anyway!

OK, I thought I would complete this thread.
After leaving my tablet for a few more days not on charge I could seem to get no life out of it whatsoever so went down the RMA route and the result of that is in the following thread;
http://forum.xda-developers.com/showthread.php?p=45065793#post45065793
Gudders.:crying:

The n8010 charging problem - My second Note 10.1 is about to be returned

I thought it might be worth writing a post about my second tablet's failure before returning it as I'm not sure whether to get it fixed/replaced or look for a refund. Maybe someone has some thoughts? After suffering the apparent failure of two Note 10.1's I'm getting worried that there is something fundamentally wrong with this tablet.
Now, I should say here that my tablet was bought refurbished. It shouldn't make a difference- I've bought plenty of refurbished tech before and I've never had problems like this but I thought it might be worth mentioning.
So, the first Note arrived faulty. It would not charge above 17%. The charge up to that point was faultless... It just wouldn't go higher than 17%. That made me think it was a software issue but nothing I could do would fix it. Back it went. It was swapped on the door so I know the second tablet was an entirely new tablet (with new charger).
The second Note I received has worked for just shy of 2 months before it too is having a lot of charging issues. It will only occasionally charge now- most of the time I can leave it for hours and it won't go up 1% but every so often it'll start charging again. The lead is fine but I can't check the charger as I don't have another to try out.
Due to my paranoia of charge failure I've monitored the second tablet with 'Battery Mix'. The graph created by the app shows a perfect flat line when the ac adaptor is plugged in. That in itself seems weird... If there was no charging occurring, wouldn't the battery lose charge rather than remain at a constant level?
The flatlining behaviour is what has me worried. Both the tablets had the same issue, the first just stuck at 17% whereas the second will stick at seemingly random levels. But the symptoms of the fault are similar.
Searching the internetz reveals similar cases as mine and, seeing as a refurb device only has a years warranty, I'm not feeling particularly confident in a third Note behaving itself over the long term.
Oh, and after all that whinging... I do actually love the Note 10.1 when it works. It's a really nice bit of kit which I am loathed to have to return.

I have had fits using the supplied stock charging cable. I bought an aftermarket cable & it charges perfectly. Unfortunately, I broke the cable two days ago & had to use the stock supplied cable. Charging is so slow it is ridiculous. I plugged it in yesterday morning at 7% & today, 20 hours later, it is only at 22%.
With the after market cable, it would charge to 100% from 3% in about 3-5 hours.

Just to follow up, I picked up a Samsung dock for the Tab 10.1 & used the charging cable from that to test it & my Note 10.1 started charging very quickly. It went from 21% to 56% in about 30 minutes.
I have no idea why the stock cable is so bad with charging, but it is definitely the culprit.
The Tab 10.1 dock is currently on clearance at my local Verizon store for $10. I am going to swing by later & grab the other one they had for a spare.

Cable is a noted problem in other Sammy forums on XDA .
jje

Thanks for the comments.
The tablet has now gone back for repair/replacement.... It's back to the old Hannspad for me until it returns. Oh joy.
I'm not sure the lead is the problem in my case although this is all just speculation on my part. I guess it makes sense in some ways- the charging became intermittent when plugged in which fits with the dodgy lead idea but when it played up it would just sit on whatever percentage it had been on when I plugged it in. Surely a bad lead would result in more uneven results rather than no change in charge (up or down) after hours of AC power?
I'm now kicking myself that I didn't save a screenshot of the behaviour as seen on the graph created by 'Battery Mix'. It was quite literally a straight horizontal line, no charge up and no discharge down. Most odd.
Fingers crossed the tablet will come back fixed. I have a fear it's going to behave itself as soon as it arrives to be tested but hey ho... We shall see. When it returns I'll definitely be investing in a third party lead.

With the original supplied charging cable plugged into the tablet, the device would drop in charge while in use. Meaning, it wasn't drawing enough/any power while in use. Also, it would sit at 22%. Never go any higher. I left it plugged in for 2 days & it never reached higher than 22%. This is on Jellybean. If I switched back to ICS, it would charge just fine.
I found several threads on the web stating exactly the same behavior.
I have since purchased 2 spare cables from Amazon, 2 Samsung branded travel chargers, & a Power+ travel charger, & ALL of them charge the tablet quickly & to 100%.
If I switch back to the supplied cable, it actually drops charge while in use.
I promise you, it is not the tablet.

Phone dies and will not power on until connected to a charger

I have had this odd problem two days in a row and suspect that I have narrowed it down. My phone has died twice with a sufficiently charged battery. When it dies, it is completely dead until connected to a charger. In fact, the first time, the charging indicator didn't come on for awhile after connecting it to the charger. I was sure that it needed to be replaced for while.
Here are some interesting observations.
I am running Cataclysm from 11/26 with ElementalX-0.11 slightly undervolted and configured for USB Fast Charge. When it died today, the battery meter read 71% although I did think that was quite high for how I used the phone. Both times, the phone would not respond to the power button at all. When I have had other phones died, they usually respond and try to boot at least. Because it won't respond at all, I doubt that it is the undervolting.
Has anyone else had this behavior? I saw one other person mention it, but the thread got hijacked to complain about the manufacturer's replacement policies. It may be that the batter meter is completely off and needs to be reset somehow.

Effects of USB Fast Charge
Has anyone had issues using USB Fast Charge? I was using ElementalX kernel which I configured for USB fast charge and used a 2 amp charger. The phone shutoff and would not power on (described below). I do not know, but it seemed to be correlated to switching to a stronger power supply in my car. I was thinking that something was overheating or otherwise having problems.
http://forum.xda-developers.com/showthread.php?p=48188176#post48188176

[Q] Battery problems

I hope I am in the right forum for this...
Lately my two year old tf700t won't stay on for more than 10 mins at a time. I have the dock and both parts say more than 100% charged.
Due to my device being out of warranty and thinking something was wrong with my stock asus rom. I downgraded the rom, rooted it, unlocked and tried several different roms.
My tablet is still turning off even though it says it is 100% charged.
Is my problem a bad battery? I think it has discharged "fully" (to where it warns me) maybe 10 times in the two years i've had it in the dock. It has almost always been plugged in or lightly used around the house. It has never been drained and recharged repeatedly to the point that I would have thought it to be worn out by now.
When I've had batteries go previously, they just drain fast from 100% to 0%. Both batteries are at 100% and it won't stay on but maybe 10 minutes unplugged. When I plug it in, it takes about 5-10 mins before it turns back on again. Meanwhile, the led by the power button blinks orange like the battery is dead. When it turns back on, it tells me I'm fully charged. grr
Does anyone know what is going on? Is there a way to test the battery or is there some chip inside the thing that needs to be reset or something.

jesman0 said:
I hope I am in the right forum for this...
Lately my two year old tf700t won't stay on for more than 10 mins at a time. I have the dock and both parts say more than 100% charged.
Due to my device being out of warranty and thinking something was wrong with my stock asus rom. I downgraded the rom, rooted it, unlocked and tried several different roms.
My tablet is still turning off even though it says it is 100% charged.
Is my problem a bad battery? I think it has discharged "fully" (to where it warns me) maybe 10 times in the two years i've had it in the dock. It has almost always been plugged in or lightly used around the house. It has never been drained and recharged repeatedly to the point that I would have thought it to be worn out by now.
When I've had batteries go previously, they just drain fast from 100% to 0%. Both batteries are at 100% and it won't stay on but maybe 10 minutes unplugged. When I plug it in, it takes about 5-10 mins before it turns back on again. Meanwhile, the led by the power button blinks orange like the battery is dead. When it turns back on, it tells me I'm fully charged. grr
Does anyone know what is going on? Is there a way to test the battery or is there some chip inside the thing that needs to be reset or something.
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It sounds like that you have a calibrations issue with your device. When your device is shut off by itself, you should leave it unplug about a day. Then recharge your device after a day of depletion and hope that it will solve your problem, good luck...:fingers-crossed:

Mhhhh - "almost always plugged in"?
Not the best use for these batteries. 2 years of that could have killed it.... And then - may not have anything to do with it if the battery went bad. 2 years is not an unreasonable life expectancy for a battery for a portable device.
In addition to LMK's suggestion, you could try this:
Let it die and then sit for a day unplugged.
Connect it via USB to your PC and let it trickle charge for 8+ hours (charging indicator will not even come on). Make sure your PC doesn't shut down or go into sleep mode during that time.
It should be charged enough to boot it. Check if it made a difference.

Not Charging whilst on!

Amazed at long battery life, almost 5 hours SOT time and 50 % battery usage. Just plugged in OEM charger and it's not charging. Going to settings/battery, it says, plugged in, can't charge right now. The phone is cool, and has not been used excessively. I powered it off, and now it's immediately charging ok. Powered it back on and now it's charging ok...??? Any ideas folks? Anyone seen this before?

@gsw5700 Did you ever get this sorted?
I'm having the same issue, have sent full repro dumps to OP (in response to my filing a bug), but I haven't figured out why we're "the few", although the reports are growing, in the OP (manuf.) forum.
I can charge with my Dash charger, most times, but almost never with a regular cable, even a 2.4A source, but mostly my Qi receiver, which is good for about 550-700ma. This setup had worked on my 5T (my wife continues to use it to charge, it's just "part of the phone" for her).
Frustrating, REALLY frustrating, for a new, flagship device. I might exchange it, but I suspect it's s/w, because if I reboot, it'll charge low-current, one-time, until I stop charging, then a reboot is the only thing that allows it to work again.
"Reboot to charge", it's almost a feature, NOT ;-]
I too have really awesome battery life, once it's charged, it's really solid all-day, easily, that part is great, once I can get it charged (non-Dash) ;-]

Hi, this only ever happened once, on the first day or so that I got the phone. It's fine now, charges really fast and cool on the dash charger. Also charges fine on standard chargers, just slower

Hmm, okay, well thanks for the update.
I'm sending mine back, something "weird" is up here, and even if it "feels" like s/w (the reboot "fixing it once", rinse/repeat, for example), I'm not taking any chances.