Develop Bugs

[Q] Terrible Battery Life - Hardware Fault?

I've had my new desire z about 2 weeks now, and am utterly dissapointed by a frankly dreadful battery life.
It's my second DZ, given the original was nicked, but (kicks self) wasn't insured, so was purchased from a supplier that shipped my phone from Hong Kong (I live in UK, and the new phone is an identical model, except for a slight difference in key layout - A2727 I think is model number)
The original phone would give me over two days life with very low use, which i considered to be fair for a decent smart phone.
The new phone barely gives me 10 hours with no use. I've done a couple of tests - unplugged it at 2am, but 8am it's at 30% or lower. This was done with all data connections turned off.
If i leave the new phone to go dead then that's it - it won't charge. The only way i've found to get juice back into the battery is to hold it in my old touch-pro 2 until it's charged enough to charge from the desire.
Last night was the clincher. I've gone out with some friends to the pub. I had a conversation over it, and checked my battery life - 42%. As a last dith effort i factory reset the phone at that point to rule out a mischevious app, and checked - 39%
Within 2 hours, and with no use at all that was down at 8%. In order to avoid the charge issue i cut my losses and turned it off at that point. Once home (oh, about 4 hours later maybe) I was unable to turn it back on. I then left it plugged in overnight, and was still unable to turn it on this morning until i'd done my cross-phone charging trick.
I'm now entirely convinced there's some form of hardware issue at fault here, so i'm wondering if anyone else has had the same problem with this phone before? I see lots of thread regarding poor battery life, but most seem to be solved by turning data off or some rouge app, neither of which are an issue in this case. Also, any hints for making my life easier when I phone HTC tomorrow? I've read elsewhere their support might not be all it should be.
Thanks in advance for any help! I've ready to pull my hair out as what is a fantastic phone otherwise has been completely ruined by this battery issue.

I think you should get a new battery to rule out that the battery itself isn't a problem. I had similar issues with my G1 a while back and it solved a lot of wierd, seemingly unrelated problems. Batteries are pretty cheap online, $15 or so and some are free shipping.
The way that I figured out my battery was toast was by comparing it to other batteries. it had a bulge in the center where it should have been flat. Fingers crossed it isn't hardware.

had already tried a diff battery (did you know you can chew a corner off a touch pro 2 battery and make it fit??) Which i know worked fine in the old nicked dz and imo as i was getting same issue ruled out battery problem.
anyway... phone has now been returned and i'm waiting 2-3 weeks to get it repaired under warranty (though am hoping for complete replacement obviously)

Chewing on batteries has got to get you extra xda brownie points. I'll remember that
Sent from my T-Mobile G2 using XDA App

I'd like to think there was some techincal or engineering skill in there somewhere.
but it was mostly "Well, apart form this nugget of plastic they're the same shape..."

I'm having the exact same problem... When you take you shutdown to recharge a dead battery, does it sometimes try to turn back on? I left my apartment like 30m ago with 100% battery, and I'm at 84% and declining. There's nothing running. And I've replaced the battery, same issue.
I think I might just RMA this one.. seems like an engineering issues.
Edit: I'm the 40 seconds it took me to type this, battery dropped to 82%.

Wanted to bump this post. I've since wiped / reloaded and wiped battery stats. It's still jacked. I think it's an internal electrical thing. Reason is: I'll power down to take the battery out. When I put the other one in, it'll turn back on. Or if I power down to charge, it'll turn back on - plugged in or not. I don't want to deal with the RMA process again, but I think it's my only choice. I've taken two phone calls this AM @ 100%, and it's at 96% now. Drives me insane. Ugh... I'll call TMO. Anyone know if the replacements are still rootable?

So... I had my phone replaced, and it's still doing the horrid battery thing. Flashed CM 7.1 RC3 or w/e the latest is, cycled one battery - and it drops like a stone. I have two chargers (one at work, one at home) and they both charge the phone up to 100%. But it's still losing battery life quicker than I'd like. I used to be able to get a good 18 hours out of this phone. Even with a new battery and a new phone, it's acting up. I'll try to flash an older ROM and see if it's the same thing. I updated to #130 nightly from 7/10. We'll see how it lasts today. But I do remember I had horrible luck with CM's ROM's on my G1. Battery would just drain for no reason. The main process taking up the most battery life is "Cell standby" so I changed to the latest radio - and it still drops. OP - have you figured out your problem? I've removed a ton of apps, and it's still messing up. I listen to music for... 45m in the AM, and I get down to 54%. I've formatted my SD Card as well.. it's driving me insane.

I just flashed CM 7.1 a few days ago and while the ROM is great, it does seem to be a litter harder on my battery than 6.1 was. With light/moderate usage yesterday, I got about 16 hours and that was running the battery almost completely dead. With heavy usage, I get about 10 hours and need a bump charge in the afternoon.
You might want to look into getting a Mugen 1800mah battery. You can get them on Ebay from 35-40 dollars. The seller 'nakedcellphone' is based out of Southern California and another user has confirmed ordering from them and getting a legitimate battery (lots of fakes on Ebay). Either that, or carry a charger with you...
Have you tried using Watchdog to see if there are any 'rogue' apps that are causing the drain by running in the background? What about going to spare parts > battery history > Partial Wake usage? There it will show apps that are draining your battery when you're not 'actively' using your phone. For me, the Android System is the highest drain in that menu. Good luck! Hope some of this helps!

I just checked spare parts, and there's nothing too odd in there. Just my music app. And I've changed that too - thought Winamp was killing me. I'll check Watchdog. This is a brand new OEM battery along with an RMA'd G2. It has to be the OS / Radio or something. I've stripped like every non-essential app too.

Did I get a lemon battery?

I recently got a Note 8 (for the pen) after having a Blackberry Playbook. The Note 8 charges fine, but if I put it to sleep overnight (with a full or nearly full charge, I find a low battery notice in the morning, or it does nothing unless plugged in. The Playbook will go down by maybe 10% overnight. I used the app manager to turn off all the applications I can see. Samsung support chat had me reset the device to factory settings, but the battery is still not sleeping correctly--or is it?
Since the playbook is heavier, I assume it has a heftier battery. Maybe you simply must power down the Note 8 at night? I like the device, but if I got a lemon I had better return it now.
What is the normal battery behavior on this thing? Thanks for any help. (BTW, I am a total android newbie and not looking forward to spending yet more hours working on this.

jventola said:
I recently got a Note 8 (for the pen) after having a Blackberry Playbook. The Note 8 charges fine, but if I put it to sleep overnight (with a full or nearly full charge, I find a low battery notice in the morning, or it does nothing unless plugged in. The Playbook will go down by maybe 10% overnight. I used the app manager to turn off all the applications I can see. Samsung support chat had me reset the device to factory settings, but the battery is still not sleeping correctly--or is it?
Since the playbook is heavier, I assume it has a heftier battery. Maybe you simply must power down the Note 8 at night? I like the device, but if I got a lemon I had better return it now.
What is the normal battery behavior on this thing? Thanks for any help. (BTW, I am a total android newbie and not looking forward to spending yet more hours working on this.
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If you look in the battery option in the settings menu, it will give you a breakdown of the battery usage and should help you identify what the main culprets were in eating up your battery. My guess it would be having all the connections (GPS, wifi, etc on while the screen is off). It could be something else, either way that should help you narrow down what the issue is. Click on the graph to get a view on the hardware usage.

take it back; the battery shouldnt go down more than a % or 2 every hour when idling, so you got a dud..

jventola said:
I recently got a Note 8 (for the pen) after having a Blackberry Playbook. The Note 8 charges fine, but if I put it to sleep overnight (with a full or nearly full charge, I find a low battery notice in the morning, or it does nothing unless plugged in. The Playbook will go down by maybe 10% overnight. I used the app manager to turn off all the applications I can see. Samsung support chat had me reset the device to factory settings, but the battery is still not sleeping correctly--or is it?
Since the playbook is heavier, I assume it has a heftier battery. Maybe you simply must power down the Note 8 at night? I like the device, but if I got a lemon I had better return it now.
What is the normal battery behavior on this thing? Thanks for any help. (BTW, I am a total android newbie and not looking forward to spending yet more hours working on this.
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Click to collapse
hi
(i stated this in another thread while back),
i am on stock rom,not rooted and leaving Note8,in standby, overnight i get +_ 1% drainage for plus9/11...12 hrs..
i ran n test to see my battery drainage, and did 25 hrs on 6 % ( from 100% down to 94 %)
in this period i connected to web,twitter update weather update,google play update ,otherwise i left it to see results ..see screenshot
i would say its a 3 rd party app or otherwise you did not" tweak" ...3g off ,location ,etc.etc it right
My battery drain is excellent.i have had Note 8 for a couple months and also have the note 2
the note 8 gives better battery service( slightly ) but better ..in my case..
good luck

wase4711 said:
take it back; the battery shouldnt go down more than a % or 2 every hour when idling, so you got a dud..
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This. Don't even waste your time trying to resolve the problem. You definitely got a lemon.

Thanks--now store or Samsung?
Thanks to everyone for the replies. I just did a different kind of reset with Samsung--holding down buttons rather than going into settings. We will see. But if the problem persists, am I better of returning to Best Buy (I missed their fifteen day return window by a day or so) or using the service request directly with Samsung? (The store involves a bit of a drive.)

Update on battery
I just wanted to post a quick update. The hard reset (holding down the power and volume up buttons together) seems to have done the trick. At 1:30 today my battery read 83% and I have had it in sleep mode for 5 hours now and it is reading at 82%. Unless it is just that the meter is wrong, the Samsung Support Chat process SEEMS to have worked. I will try tonight and make double sure.
Once again, thanks to all who replied. The information really helped.

If you got a lemon, I joint to make a big lemonade!
I have a 5120 LTE.
After a full charge it doesn't last for half a day.
I paid attention tweaking everything: from LTE to 3g, saving energy mode, screen light, wifi on-off, gps etc.
Now the point is: I wanted this tablet to do a lot of things and it seems I can't really do anything.
And yes I already have a hard reset.
It's rooted so the guarantee is spoiled.
I hope 4.2.2 release will help me somehow.
Anyone suggesting a good tutorial to change the battery?

Battery Sudden Drops

Dear all,
Recently my Note is facing a weird problem. While my son is playing a game, the battery drops 20-30% in 10 minutes. If I shut down the tablet and re-power then the battery goes to normal again.
In the battery stats I can see a huge drop during game usage and then up again on reboot.
I performed a factory reset but the same happens....
I flashed the Kit Kat via Odin.... but the same
Any ideas?

Drain the battery down to below 5% then charge it to 100 and it should be fine. It happened to me once and after a full charge after a full drain it never did it again
Sent from my SM-G900T using Tapatalk

toyanucci said:
Drain the battery down to below 5% then charge it to 100 and it should be fine. It happened to me once and after a full charge after a full drain it never did it again
Sent from my SM-G900T using Tapatalk
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This is what worries me.
I drained the battery and charged it fully powered off. It did it again. I drained the battery and charged it fully powered on. It did it again.
If I'm using it for browsing, papyrus, images etc its fine. This happens only in games and when i reboot the battery percentage is ok again.
strange....

STELIOSFAN said:
This is what worries me.
I drained the battery and charged it fully powered off. It did it again. I drained the battery and charged it fully powered on. It did it again.
If I'm using it for browsing, papyrus, images etc its fine. This happens only in games and when i reboot the battery percentage is ok again.
strange....
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Click to collapse
I had the exact same problem as you are describing but additionally, my overall battery life wasn't lasting as long as it should either. I ended up sending it to Samsung's repair center to get fixed. I'm not sure what they did but some other people on the forums suggested it was a motherboard issue.

So the capacity of the battery seemed just fine but the readings were crazy (dropping from 50 to 5 in minutes and then on reboot back on 50).
After 2-3 full cycles of charging nothing changed. Flashed fw nothing changed. Went to Samsung service and they just informed me that they changed the battery and now performing final checks.
Hope this will solve the issue. I'm too lucky that I am in the "6 months warranty" window for battery...

How does one go about sending it into Samsung? After getting it back, did you see a significant change?
I've been debating doing this but wasn't sure how to go about it.

I haven't got it back yet. They just called me and they said that apart from the battery, they need to change another part (the telephone operator didn't know which part) and I'm going to receive it tomorrow.
So I'll let you know once I receive it.

STELIOSFAN said:
Dear all,
Recently my Note is facing a weird problem. While my son is playing a game, the battery drops 20-30% in 10 minutes. If I shut down the tablet and re-power then the battery goes to normal again.
In the battery stats I can see a huge drop during game usage and then up again on reboot.
I performed a factory reset but the same happens....
I flashed the Kit Kat via Odin.... but the same
Any ideas?
Click to expand...
Click to collapse
Did you fix the problem ? I have the same problem and i don't know how to fix it. (i am with 4.3 not rooted).

Rupar4o said:
Did you fix the problem ? I have the same problem and i don't know how to fix it. (i am with 4.3 not rooted).
Click to expand...
Click to collapse
After trying everything (flashing different roms via odin, factory reset, full battery cycles etc) the problem never went away.
Went to Samsung service. They checked the battery and had to replace it.... within the warranty.

Same issue here. Just got an email saying its fixed. They changed the charging port and lcd. Weird that they replaced the lcd.

Well I got it back. Seems they broke the s pen function when taking it out or putting in. The tablet thinks it's always out of its slot. I guess another 2 weeks without this thing. What a pain in the ass. Times like this makes me wish I bought an ipad where I could just walk into the store and get it fixed that day.

I had the same problem. I sent it back on Monday and got it back 7 days later. They did not say what they changed, but now everything is working fine. I even got a new usb cable and a magnetic Germany flag

I sent mine in for an overheating problem and they changed the charging port and gave me a new cable. I initially also had the random drops in battery but seems to be better now.. They said bad voltage going to charging the battery or something. Still have overheating so gotta send it in again?
Sent from my SM-P600 using XDA Premium 4 mobile app

So guys did you get it fixed? I have exactly the same problem. I have sent it to fix at the sam service - they changed the charging port, but it didn't help anything. 1,5 years of normal usage and now I can pretty much throw it into the toilet. God damn POS!

Galaxy Note 10.1 2014 battery drops
Hello all,
Just wanted to inform you all that I have been experiencing these battery drops (yesterday from 93% to a mere 5% in a matter of minutes) for a very long time now. I am running under the latest 4.4.2 stock firmware.
Also, battery life is way below par (understatement !), where the Note sometimes drops to around or below 5% (the magic number below which the screen starts to dim pretty dramatically and there's no way to influence that)
Funny thing is that after the battery drops to below 5% or even 1 or 2%, it's still possible to use the tablet for quite a number of hours afterwards, which suggests it may be something with the logic estimating/determining the remaining battery capacity, rather than the battery itself....)
Now I've tried draining the battery and fully recharging it multiple times/ resetting the stats using free apps / revert to factory settings etc.
All to no avail unfortunately, this problem simply keeps coming back.
(By the way: Apart from the battery and battery life, the Note is an excellent device, and delivers as promised.
Please also note that charging it through the microUSB cable is also simple, stable and relatively fast, unless you compare it of course to my all new Samsung Galaxy Note 4, which has a superior fast charge mode and offers the highest possible battery-life at this moment and easily beats any other smartphone (including the usual suspects from that Cupertino-based firm of which I can't force my mind to remember the name of.....) in this price-quality and performance category )
As for warranty:
Battery is no longer under warranty, the device itself is.
As such, I will now get the battery replaced by a new Samsung OEM-battery first, and see if that resolves the issue.
If it doesn't help, I will send it in for repair for Samsung.
I will keep you all informed on the resolution and cause.
Likewise, if there's anyone that has gotten to the root cause of this issue, please let me / let us know
Some users reported some 'magic part' OTHER than the battery itself (motherboard / charging circuit or even the lcd ??) having been replaced by Samsung after sending it in for repair.
That information could be very valuable to us all in trying to get Samsung to resolve the issue, so I would really appreciate it if someone would share this info in this thread.

Hey I know that there hasn't been much activity on this particular thread, but i too have been experiencing this problem for over a year now. I sent it into samsung twice and it still never fixed the issue and by the time i was going to send it in the 3rd time it was out of warranty. I personally removed the back cover and unplugged the battery for a while and that did not help. I have tried flashing different ROMS and kernels to no avail until last week. I flashed Temasek's Unofficial Build found here http://forum.xda-developers.com/gal...t/lt03wifi-temaseks-unofficial-build-t2980604 and after 3 full power cycles i have not had a single random drop yet i even managed to go 3 days with 6 hours of screen on time which is a record for me with this device. Not sure if it will help everyone but this seems to have solved my problem and i am thrilled! Also (as embarrassing as it is) i played 2.5 hours of Clash of Clans straight without a single random drop either.

I am beginning to have the issue as well on my P605v. Has there been any progress with your battery replacement? @mroset

KwestJones said:
I am beginning to have the issue as well on my P605v. Has there been any progress with your battery replacement? @mroset
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Hello KwestJones,
I've successfully replaced the battery in the Note 10.1 2014, and it has improved things. With a little care, this is easy to do. Just removing the battery connector is a bit typical, you need to lift it carefully and slightly to remove it.
The result is not as drastic of an improvement as I would like to have seen, but at least the sudden drops in battery capacity percentage seem to be under control now.
I am doing a video test now, and will see how it behaves and let you know.
BR,
Maarten

Very curious to hear if replacing the battery corrected this issue. I've been experiencing this same battery drop issue for 2 or 3 months and the unit is well outside of warranty. Hoping there's a simpler fix, but willing to replace the battery if that will work since the tablet itself is still a great unit.

Complete factory reset should clear the Android Coulometer's data base or learning algorithm. Just clearing options of Battery Monitor Widget for rooted devices won't help. There are some other apps, which seem to help if the charge level never reaches 100%, a related, but not identical problem.
I have an old tablet suffering from this, with a tweaked custom rom, and i didn't want to clear and setup that completely. The algorithm or database is "learning" again, and the capacity jumps have become fewer and smaller over the last months. It should depend on how long the device was used and never reset before the incident. In my case over a year.
Itvs much like my cars fuel calculator, which won't work correctly during traffic light stops. Right after starting the engine, fuel consumption can raise several liters/h, when the car don't drive, as it uses the last sampled value(every 30 meters). And you need several kilometers to drive to have these levels drop to realistic ones again. While after a long driving distance, a traffic light stop will hardly have an influence.

[Q] Dead end with Samsung can I have your feedback please

TLR Anyone willing to see if their tab pro drains battery when fully powered off. Like overnight when you're sleeping or at work. Thanks
Hi,
I got a 10.1 tabpro back at the end of Jan. I thought it would be a massive step up from my Nook HD+ (rooted) but it's not. Not only is it slower than expected the battery life is atrocious. Samsung advertises over 2500 standby hours for their 10.1 tablet, I get 200. Also I get about 6 hour video, mp4 files, not 10 and I don't like a bright screen, I know companies exaggerate but this is daft. But it's the standby that's a problem, having to charge it every few days in case I want to use it is a big step down from my Nook.
It's been into Samsung repair 4 times now and I'm currently at a dead end.
Problem
It loses 0.5% an hour on standby even with wifi, gps, updates off etc
It loses 0.5% an hour fully powered off. Fully powered down. OFF, not on standby. Just to be clear
Compare this to my nook with a smaller battery capacity which loses less than 1% a day. I've tried turning off other android devices (mobiles & tablets) and none lose battery over 12 or 24 hours when powered off.
Current situation
It's been in 4 times, it has been returned with a squeaky corner which they've failed to repair and the retail box is torn and tatty like they played football with it.
I've now been told
I have spoken to our product specialist regarding this and the decline in battery life over the 24 hour period is not considered to be unusual. In the 12 hour period where the tablet was powered on, even though the screen is off and apps closed down the tablet will still be transmitting, searching for system updates or connecting to networks or wireless. The 12% decline in battery is considered normal for this kind of activity.
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Click to collapse
This doesn't address that wifi, gps, updates etc is turned off and drain whilst it's powered off. I responded 2 weeks ago but there has been no reply.
Feedback please
1. I've been all over the internet. I've tried greenify, I've tried battery calibration, there's a ridiculous amount of bloatware that I can't delete but I've reduced apps running as much as I can. Does anyone have any other ideas?
2. What's your tablet like, does it lose battery life when powered off? I've seen people posting on here about their 8.4 inch tabpro and they've put screen shots showing better standby battery life than my 10.1 with a much better battery capacity.
I've attached some screen shots, less than 3 days and it lost 33% doing nothing on standby.
I would really appreciate if anyone could feedback on battery life when switched off, is someone able to test theirs for me?
Many thanks,
Anna

Is someone willing to see if their tab pro loses battery even when powered off?
Thanks

Uh-oh. I hope this is unusual and anomalous. I'm actively seeking a replacement for my HD+. I want to love it. I *SO* want to love it but it infuriates me that the browser crashes so often. Yours? Which ROM?

Nook is fine, It's the Samsung that's utter pants. Nook battery loses less than 1% a day on standby and screen is good. Surprisingly I thought the octo core samsung wouldn't be laggy but it is, it's not that much better than the Nook.
I have cyanogenmod 11 I think. Yes the browser crashes but that's partly because many sites are badly designed and web 2.0 is badly implemented and I use Dolphin because I like the format however it's a terrible browser for crashing. The new Guardian site I struggle with on tablets and mobiles no matter what browser for example.
Anyone willing to test their tabpro for me????

I'm actually on my 3rd day with my 8.4 it's 10:35 pm and I still have 35% left

cloud71 said:
I'm actually on my 3rd day with my 8.4 it's 10:35 pm and I still have 35% left
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I don't understand. 3rd day of what, off, on standby, has it been used?
Mine loses battery at 0..5% an hour on standby and fully powered off. I'm trying to establish if other tab pro's have the same level of drain on standby and powered off. Can you give me more info please? Thanks

carltonbp said:
It's been into Samsung repair 4 times now and I'm currently at a dead end.
I've attached some screen shots, less than 3 days and it lost 33% doing nothing on standby.
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Take the rear cover off, disconnect the battery from its connector. Bring it to a repair shop where they can do a solder work. Ask them to re solder the battery connector, this rework only takes under 5 minutes. It will fix the problem of battery quick discharge. If the problem is still the same, you only need to replace the battery, cost only around $30 for new battery.

Beut said:
Take the rear cover off, disconnect the battery from its connector. Bring it to a repair shop where they can do a solder work. Ask them to re solder the battery connector, this rework only takes under 5 minutes. It will fix the problem of battery quick discharge. If the problem is still the same, you only need to replace the battery, cost only around $30 for new battery.
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Thanks but it was only a few months old so well within warranty.
They replaced it with an tab s 10.5 (no more tabpro's available). Tab s gives me the battery life I expect and speed. Big difference between the two is the tabpro used up a lot of battery with 'tablet idle', well over 50% whereas on the tab s it's a few %. I think the tabpro didn't quite deliver, it was discounted quickly, the software wasn't right plus squeaky case, but so far imo they seem to have got it right with the tab s. Despite the lower capacity battery and bigger screen it lasted me over 5 days and that included setting up and installing apps. The tabpro by that point would have been long dead.

I'm glad you get a new replacement but this's a common problem of Samsung tablets . Be aware of this problem is the future of battery quick discharge. Most users just simply think this is a problem of battery.

SM T-700 is loosing energy while turned off!!!

Hi all and Happy New Year.
The problem is that while my T-700 is turned off (not screen off) and having installed a new battery (doing all the preparations needed, like reset to factory settings, clear cache, recalibrate new battery), in two days time the battery from 100% is COMPLETELY DRAINED like a freaking 0%! And allow me to repeat ...WHILE TURNED OFF!!!
The battery is brand new, and the tablet is "untouched" (meaning unrooted, no UB, Knox is 0 and I have installed only the Official OTA's provided by Samsung).
WTF???
I've contacted the place where I bought the battery and they told me that they will send me a new one, BUT that was the exact same reason why I bought this one and changed my battery in the first place (of course I haven't told them that) lol.
Could this be a hardware issue, or was I so unlucky that I just happend to buy a "dead" battery?
Any ideas? Plz help, I'm in desperate need of my T-700 for working purposes...
Thanx in advance!

ANYONE??????

I can't say my battery is brand new, but i have been having battery issues lately no matter what rom I use or if I return back to stock. I have no idea why it would be doing so though.

Do you think we can blame the tablet's motherboard? Cause it's the last thing I can think of that would be responsible for these issues since software obviously isn't (At least in my case I hope for a DOA battery issue fingers crossed..).
Anyway, I've ordered another battery (e-bay) that would be arriving in approx 3 weeks. We'll see...
If no luck again, then a repair center will provide the appropriate answers...

I have the same issue with my Tab S SM-T700 and I have tried flashing many different ROMs, the problem still exists. I would suspect a hardware fault, either the battery management IC or some other consumer that doesn't power down properly. Don't think this can be fixed without a new motherboard, at least it's still usable plugged in!

Pis_Man said:
ANYONE??????
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I have purchased several batteries for my SM-T700 from different suppliers on eBay. Apparently, there is a big market for batteries pulled from old devices and relabeled as "new". Based on the poor specifications (I.e. battery capacity, battery life) I suspect that not one of them was actually new. For example, one battery held so little charge after just 16 discharge/recharge cycles that I had to replace it. Perhaps, you have a bad battery.

There is an option somewhere in the settings to turn off wifi when the tablet is not in use. This solved this problem for me. It's the misbehaving apps that "call home" or use other resources while your tablet is supposedly asleep. While it's possible to hunt down at least some of these apps, it's kind of hopeless because some of the worst offenders are google's own apps and services. When wifi is not available they all go to sleep and the tablet can now stay idle with screen off for days without draining battery. Before I enabled this option, the tablet would literally drain 1 percent of charge per hour even though not used, so after two days of no use 50% was gone.

Akopps said:
There is an option somewhere in the settings to turn off wifi when the tablet is not in use. This solved this problem for me. It's the misbehaving apps that "call home" or use other resources while your tablet is supposedly asleep. While it's possible to hunt down at least some of these apps, it's kind of hopeless because some of the worst offenders are google's own apps and services. When wifi is not available they all go to sleep and the tablet can now stay idle with screen off for days without draining battery. Before I enabled this option, the tablet would literally drain 1 percent of charge per hour even though not used, so after two days of no use 50% was gone.
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I see what you mean but my problem is when the tab is turned off not asleep...

ROM-Rookie said:
I have purchased several batteries for my SM-T700 from different suppliers on eBay. Apparently, there is a big market for batteries pulled from old devices and relabeled as "new". Based on the poor specifications (I.e. battery capacity, battery life) I suspect that not one of them was actually new. For example, one battery held so little charge after just 16 discharge/recharge cycles that I had to replace it. Perhaps, you have a bad battery.
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True... But previously bought battery was not from ebay but from a retail seller... The newly bought one will be from eBay. I'm still waiting on that. Will inform when it will arrive...

That was it... Main board problem... Need to spend 200€ (which of course I won't) in order to fix it. Still, I can work with it as long as it is always plugged in... Unfortunately it was not a battery issue...