yashsingh1/xdaforums huggingface dataset:
[Xperia Z1 Compact Q&A, Help & Troubleshooting] uchihakurtz:
You're lucky man, enjoy your fixed phone.

I think it's because he realised that the charger was messed up not long after using it. I've been charging for a whole months or more since the problem occurred so it was probably too late for me.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] SethPDA:
You are right. When I discovered this issue, I just used the Sony charger just a few times, like 4-5 times, and after that, I switched to the Samsung one. Then probably you're right, I was just lucky.

I didn't wanted to change my battery because after reassembling, I'm not sure it will be still waterproof. So yeah I tried everything to avoid battery changing.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Revontheus:
If you have an unlocked bootloader solving this would be easy, its the kernel that determines how much power the battery needs to alot for specific tasks you do using your phone. A quick and easy solution would be to use a custom kernel. Since most of them provide multiple features like Overclock and undervolting.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Unfortunately that's now how it works in this case. Reading through the thread would show you that many people have tried different roms, kernels, etc. In this case it is physically the battery that is the problem (except for the one guy who's charger was messed up).

The battery reports a voltage to the kernel, the kernel then uses this information to do the stuff you talked about. However in this case the battery doesn't report the correct information and shuts off prematurely/erratically.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Revontheus:
Judging by the info given by you and other users :), The best course of action would be to bring the phone to Sony and let them fix it, since according to you its a battery problem then Only they have the capability to fix it ( unless you yourself are a technician )
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
That would be the best course of action if you still had a warranty or a sony repair center near you.

However for some of us who imported the phone that's not an option. Or if your warranty is expired. Replacing the battery yourself fixes the problem and takes no technical skill at all. If your warranty is already void (which your recommendation of a custom kernel would do), paying 150 for a tech to do something you can do for 50 is just dumb.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] uchihakurtz:
Unfortunately, there are some places where Sony doesn't have any official Service Centre like my country. I was told that even if you fix it at Sony's place, they actually send your device to a third party phone repairer which will probably break the waterproof. And it takes certain skill to fix it by yourself.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
I was in the same boat as you. No way was sony going to fix mine without me paying shipping both ways and another 100 or so for the parts. That's why I fixed it myself.

I'd like to emphasize that it was incredibly easy to replace the battery myself, however I have no doubt it is NOT waterproof anymore. I've never repaired a phone in my life, but the directions on witrigs YouTube channel proved to be enough.

So i lost waterproof, but gained a working phone for maybe 40 bucks total. If you're patient it's possible.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] uchihakurtz:
Losing waterproof for me is a huge deal since it's quite annoying opening the USB flap. You can use the magnetic charger but it's really hard positioning it right at night, lol. So I had to take the worst move, selling it cuz I also found out that Sony has almost no resale value here. :'(

Damn it Sony, they have nice phones and all but they need to improve their service everywhere. Not only that, their recent phones are somehow unimpressive so far. I hope they get better soon.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Oh believe me, I'm upset that its gone. Waterproof was a huge selling point for me. I don't think I'll be buying a phone without a removable battery after this. However I don't have the money to replace it with a new phone with comparable specs (especially considering the non existant resale value you mentioned).

So in the end it was either an unreliable phone with unpredictable battery life and waterproof, or reliable phone with no waterproof. Lesser of two evils unfortunately.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] uchihakurtz:
I feel you bro, this definitely traumatised me on buying a phone with a non removable battery. Especially with a crap service centre. But since you live somewhere in the US, I'd say the upcoming Moto X Style would be a great deal with its price.

Anyhow, good luck surviving. Let's hope the 5.1.1 update won't ef things up again and it's most probably more safe to clear data before updating.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Thanks man, I'll keep wiping my phone with every update and hope I don't run into trouble. Whenever this phone bites the dust I'll have a hard time justifying sony again (which is sad because I do like how their phones are designed).
[Xperia Z1 Compact Q&A, Help & Troubleshooting] ravindu_ravi:
my sony z1 compact battery 30% come after shutdown

https://drive.google.com/open?id=0B2J0xEGjaTLRU1NELXB5YkFLeFk

how to fix this problem

my z1 c phone battery 30% come after auto shutdown

it is battery problem or software problem?

before my phone battery life is very good. but now very bad

please tel me how to fix this
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
hardware. You have to buy a new battery if you're having phoneshutdown after % drop.

You can buy from aliexpress.com or dealextreme.com

cheers.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] shahpiyushv:
I too have tried all online/offline options and it clearly seems that Sony does not care about their customers in India. I was told that it will cost Rs.13,500/- for repair, which I obviously wont pay. Please update me if you find any solution in India
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Can you order the parts yourself and replace it? I don't know much about shipping and such to India, but that's how I did it.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] coolkoushik07:
There is no genuine part seller in India. Just think of sony official service centres.. They cant provide parts for particular this z1c model then how can others provide you original one? You can order it from witrig or ebay. The price of product with shipping is almost same.. If you have PAYPAL then buy it from witrig. Else buy it from ebay. I already bought a battery from ebay and getting good battery backup .
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Ger$$on:
Ohh, so sad, my z1c has joined to the "30% shut down club" one month ago. I thought that the android 5.1.1 update will solve it but I see no :(
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
5.1.1 is not released yet.

wait to its release so we can test it. Unfortunetly, i dont think this update will repair the battery since its a hardware failure.

i will wait for 5.1.1 and test it. only after that i will buy a battery and change it myself.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] ravindu_ravi:
i replace new battery. now this problem sole. but i downgrade KIT KAT 4.4.4

thank you reply to me
[Xperia Z1 Compact Q&A, Help & Troubleshooting] SStylish:
Hello guys,

Where can I find a video to replace the phone's battery? Is that easy to do?

Thanks.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Here's the video I used:

https://youtu.be/Io9jHfs6z94

It shows right up to the actual battery removal, which is super easy. Just disconnect the ribbon cable and remove the battery. Place new battery inside and connect cable.

I was able to replace my battery having no previous experience working on phones or tablets. I'd highly recommend purchasing a new back as well, the adhesive on yours probably won't be salvageable if you just get the battery.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] SStylish:
I just changed it, it works perfectly now. Thank you :)
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Awesome! Glad it worked out for you!
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Den4iksome:
hi, my phone dies suddenly. Usually from 50%

Tell me, is this hardware or software related?

Android OS usually shows lots of % Usage, but can't solve it. Tried wakelock detectors.

One time it showed me following:
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
hardware.

---------- Post added at 09:54 ---------- Previous post was at 09:53 ----------

Can someone who had the battery drain bug confirmed it still present on 5.1.1 ?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] digossantos:
5.1.1 same problem

Just updated today to 5.1.1. Phone died at 55%.

About replacing the battery, how to remove the NFC from the old battery and attach to the new one?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
I literally just carefully pulled it off and then attached it to the new one. My nfc still works fine.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
Have you hard reset it?

has someone who install 5.1.1 hard reset the phone and still has the dropping bug?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Before I installed the new battery it didn't matter what rom or android version I used. The problem remains through a hard reset. I even tried a full wipe (like every partition). Problem sticks around. It's hardware, not software.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
ok... I wanted to be sure. I'll change the damn battery....:mad:
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Sorry man, I wish it weren't that way too. Would have saved me (and a few others I'm sure) quite a bit of time and money. It's a ****ty situation that's kinda made me weary of buying another sony phone with a non replaceable battery.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] digossantos:
Yes, I did a full wipe before flashing. Still same issue. Just ordered a new battery from Aliexpress. No more Sony phones for me.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
Lol i just bought from ali too....
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
is the nfc glued or something or is it easy to remove it?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
I honestly don't remember. I wanna say it was slightly stuck on and I slowly peeled it off.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Den4iksome:
Is it ok if I replace the bad battery with a new original Sony Z1C battery? Since it is a hardware bug in the Sony battery?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Yeah that's what you're supposed to do/ what myself and several others have done to fix the problem.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] alvolad:
For those who have replaced your batteries - are you running Lollipop after replacing or have you all reverted to Kit Kat ? Don't want to go to the expense of replacing battery for the same thing to happen again.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Problem exists regardless of firmware. Some of us have tried both KitKat and lollipop. Again, it's a hardware problem, so the os doesn't matter.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
my battery got ridiculously worse after the update 5.1.1

drop is now like 20-30%...

hope my new battery doesnt take long to come :rolleyes:
[Xperia Z1 Compact Q&A, Help & Troubleshooting] KrisSubh:
Z1 compact battery dies/drains suddently - SOLUTION

I own an Xperia Z1 Compact and i hav been using it for past 2 years. I started with using Kitkat and updated to Lollipop 5.0 and after the update the battery began to show problems. As the thread mentioned the charge suddently drops from 50 % to almost 15 % and then within a minute will fall down to zero and the phone will switch off. I thought it was a software problem and after doing much reseach in internet, i updated the software to Lollipop 5.1. But stll the problem was there and was getting worse. Then i read somewhere in posts to try to replace battery. I went to a Sony Service centre and within 2 days they found out that the culprit was faulty battery and replaced it. Now i am getting a decent battery life and my phone is back to normal. Even though i did not put on stamina mode and all i am getting a full day charge. ALmost same condition as it was when i had KitKat. smile happy

SO FRIENDS DON'T WASTE YOUR TIME UPDATING SOFTWARES. GO TO SERVICE CENTRE AND REPLACE YOUR BATTERY ! ITZ THE ULTIMATE SOLUTION. I CAN ASSURE YOU YOU WILL BE THE HAPPIEST ONE AFTER GETTING THIS DONE.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
THANK YOU. Perhaps my OP wasnt clear enough in the update edit. I've been trying to get people to understand that it really is JUST THE BATTERY. I'm glad you got yours all figured out man.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] abhijitcp:
battery drop - slowly getting better

well, like all other guys who've posted here, update to stock 5.0.2, battery started behaving weirdly...starts dropping from 80% to 40% and then starts shutting down from 50% odd! did all the usual software stuff...nothing worked. stopped using magnetic charger...shutdown from 50% ceased. changed charger...the problem persists (random 10-20% drops) but the shutdown thing isn't happening...phone is 1.5 years old and i just don't want to spend any more money getting a new battery for this phone! i liked sony's devices and have been using their vaio laptops for 10+ years...this is really disappointing...
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Likewise. They used to be my go-to phone recommendation. Little less enthusiastic about them now that I've had to replace the battery myself. I think my total extra paid was about 40 bucks. Which isn't a lot, but it's more than the 0 it should have been.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] abhijitcp:
ummm...USD 40, u mean, i guess...that seems the same that ebay is quoting in india...inr 2.3k (just the battery) which is 10% of what i paid for the phone...hmmm...for my vaio laptop, after 5 years of abusing it, i just changed the battery...and it cost me the same...inr 2.5k...which is 5% of what i paid for the vaio...and i'd be glad to use it another 3 years if nothing else snaps...not so sure with this phone...i don't want to use it for more than what it takes for me to save up for a new one :P
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
I totally get what you're saying. It did end up being about 10 percent of what I paid for the phone. However I don't have enough money to get a new phone. So it was either that 10% or no working phone. However my magnetic charger just stopped working so I'm less than happy with this.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] LuisSalgado:
Hello. I have a similar problem. First, my z1 compact, began to have problems with the power button, sometimes the screen flickered when pressed and sometimes unresponsive. Then, the battery began with problems, I do not know if software problem or hardware, I have my doubts, because if the screen is off, the phone turns itself off, but if I keep the display on or an application in the background as Poweramp the phone will not turn off. I'm thinking of buying a new battery, but I would like first to know if I replace the battery or have anything to do with the software.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
That sounds like software my man, I'd recommend making a separate Q/A thread about it, youll probably get more responses.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Den4iksome:
Since it is a sony battery hardware bug, is it better to buy:

A) a new sony z1c battery

B) a new battery,which is compatible to z1c

?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
As it is indeed a sony battery problem, you bring up a good point. I bought a new sony battery because I trust them to make a better battery (even if it already failed once) than some no name Chinese battery.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Darkimmortal:
Seems I am getting the same issue as many others in this thread - battery dying suddenly (25% -> 1% instantaneously), dropping from 100% to 80% very quickly, being able to watch it count down 1% each second at various other charge levels. SoT used to be able to get like 4+ hours no problem, now I only get 2.

It appears to be a hardware issue, as it basically came out of nowhere over the past month or so. Will be replacing the battery soon. I've had the back cover off about 15 times (****ty non-original adhesive refused to stick), so the battery life was likely heavily degraded from heat. That being the case I'm quite happy with nearly 2 years.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Darkimmortal:
Can confirm that replacing the battery has fixed all my issues. 90% battery after 1 hour SoT rather than 60%. I had forgotten how good the out of the box battery life was on this phone.

For anyone else performing this procedure, the only tricky part is transferring the NFC. No disassembly guides explain how to do so. You need BOTH layers - the aerial sticker and the strange metal-like sticker below it. I ended up just tearing the entire old battery white sticker off, cutting around the NFC, then duct taping the whole lot on top of the new battery. Works perfectly!
[Xperia Z1 Compact Q&A, Help & Troubleshooting] MrAmbiG:
Sony's way of consumerism to make you buy their new phone

Sony has a great history of putting spywares in their products or putting such kits. I know 4 more personally who are facing the same problem and if there is a clear possibility that sony wants you to upgrade your phone to their new model and the only indirect way to do it is by doing such crap to your with a mild update; with sony's history of having no ethics when it comes to pushing products or no regards for any ethics i will not be shocked if this is not the real reason why this is happening. As soon as the battery reaches 30% it goes down to 0% and shuts down.

Either the sony update has rigged ur phone to report the 100% to 0% as just 100% to 30% to cheat you to think that the battery is not dieng too quick or you need to get this services since unlike most of the phones majority of the service centers are just replacing these phones with a refurbished ones since they lack the tools to open it up and repair or just replace the faulty parts. The phones are being shipped to once central location in a region where there is a facility to disassemble the phones are repair/replace the particular components and apparently this is costing sony a lot. Imagine if the phone actually shows how fast the battery is dieng then all of you will run for a replacement of the battery and that sony cannot afford, especially with their falling index in the share market.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
Yeah that's a bunch of hog wash. Thanks for adding to the post count I guess.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] John.D..:
So , decided whether version 5.1 this problem?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] crimson12:
If you're asking if 5.1.1 fixes it, no. It's a hardware issue with the battery.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] uchihakurtz:
Can't tell dude, dropped my Z1C for a Note 4. Such a waste, I love Sony but they really need to improve their after sales... :(

I hope you guys fix your problem soon.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Kik3san:
I'm another victim of this bug, my phone started to shut down itself around 40%-30% battery while being on KitKat, so it's not related to Lollipop update. I send my Z1C to Sony repair center last week, still waiting for response.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
well i think youre one of the first guy to tell it also happens on kitkat. i never had it on kitkat, it immediately appeared after the LP update...
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Kik3san:
Phone went back from service center, battery was replaced and now it's working without drops so far.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] cobatts:
I sent mine to Sony Mobile after confirming that they'd fix it even though I had unlocked the bootloader and rooted it.

$10 shipping, two weeks, and a 30 mile drive to the FedEx distribution center later and I find that they haven't touched it due to "corrupted software." Pretty miffed about that.

Guess I'll have to fix it myself. Having to buy a new battery isn't a huge deal, but I'm worried about losing the waterproof.

On the brighter side, I've been using a Fire Phone running Cyanogenmod as a replacement, and while I miss the mSD card, it's taught me to appreciate a bigger screen. Might look into the full size Xperia next time around.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] shathil:
The actual capacity of a battery decreases as the battery ages through an irreversible fading process. This capacity loss occurs both with active use, correlated with charging cycles, and with inactivity through self-discharge. The device may even come with substandard batteries. However, the amount of loss is linear with time and accelerates with increasing temperature. Smartphones do not typically employ sophisticated techniques for estimating the usable capacity with the basic solution basing on simple charge cycle estimation and then using an offline calibrated lookup table to find the state of charge or battery level given the charge cycle.

Battery level or State of Charge (SOC) estimation in modern smartphones cannot capture the usable capacity of the battery run time, and thus have unreliable SOC estimation. This inaccuracy manifests as sudden jumps in the battery level, and can result in unexpected shutdown of the device.

Therefore, there are two issues; (1) The battery capacity is reduced, and (ii) The device is unable to estimate the capacity loss. The detail about this can be found in the following paper.

Sudden Drop in the Battery Level? Understanding Smartphone State of Charge Anomaly
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Kik3san:
Well, 5 days after battery replacement, my Z1C battery dropped again, so I sent it back to tech support... Let's see what happens now.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
you're the first guy that says the drop came back after replacement. Didi you buy an original battery? are you sure its not battery drain (wich could be 3423 things) instead of battery drop?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] Kik3san:
I have the paper from Sony's local support company (not Sony itself) that made the replacement, they said the battery was damaged so they changed it. It was done under warranty, so I hadn't pay anything.

Z1C turns off itself at ~30% battery, sometimes more or less. I can count from 40-30% and then the phone turns off. I sent it back to Service so they will give me a response tomorrow.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
cool. let us know.
[Xperia Z1 Compact Q&A, Help & Troubleshooting] marcolorenzo:
I had a Z1 Compact which I gave to my girlfriend. She is reporting the same problem. It kinda sucks because she was always using iPhones before this and then I finally managed to convince her to go Android with the battery life of my Z1 Compact as one of the big convincing factors. And then this happens.

This is obviously a problem with the phone, not a usual wear and tear or user misuse issue if it happened to all of us. I don't have much technical knowledge but do you guys think it was brought on by Lollipop? I'm not under warranty anymore but if Sony's OTA update damaged our phones then aren't we entitled to compensation?
[Xperia Z1 Compact Q&A, Help & Troubleshooting] profyler:
they wont admit it, but yes, something trigered somethin on LP and this s*it happened.