Database Users

help with battery power

Hello to you all,
My new XDA Exec has developed a fault. It works OK when plugged in to the USB on my laptop or charger but when running on battery will only do so for a short time. In fact a matter of a few minutes.
The battery indicator shows the battery at 100% when charged but the phone turns off variously at 95 - 98%. I tried a soft reset and not change.
I tried discharging the battery using small lamp then recharging in the phone. The battery indicator did show a lower %age 80 ish but not as low as I would have thought. Subsequent charging made no difference and the problem persists. Has anyone seen this before? Any bright suggestions?
Many thanks to you all for you time.
Cheers
Piran

Piran Bassett said:
Hello to you all,
My new XDA Exec has developed a fault. It works OK when plugged in to the USB on my laptop or charger but when running on battery will only do so for a short time. In fact a matter of a few minutes.
The battery indicator shows the battery at 100% when charged but the phone turns off variously at 95 - 98%. I tried a soft reset and not change.
I tried discharging the battery using small lamp then recharging in the phone. The battery indicator did show a lower %age 80 ish but not as low as I would have thought. Subsequent charging made no difference and the problem persists. Has anyone seen this before? Any bright suggestions?
Many thanks to you all for you time.
Cheers
Piran
Click to expand...
Click to collapse
You battery is dead therefore you would need to change. You are not unique with this problem. That is common issue for Universal (exec) batteries. For your new battery: dont charge with the USB cable and charge when is completely drained.

Hi Bulldog,
thanks for the reply and the info. Regarding charging the unit from the USB port. Does the unit not begin charging as soon as it's plugged in to a USB port? Is there a way to prevent this that you know of? My phone was normally charged for about half it's life from the charger, half from USB.
From what I understand the LI ion batteries don't have a charge memory due to milisecond pulse charging so pardon me for asking but what does the total discharge do for the battery? Obviously it does something but what? (Not doubting you but I'm curious). Is there a away to ressurect a defective battery such as the one I have currently or is it a lost cause. I know some batteries can improve with either heating or cooling by about 20 - 40°C from normal operating temeprature, have you any experience with this?
Do you know if some makes of batteries are better than others?
Please pardon the inquisition but as I spend a lot of time in remote areas it's often quite handy to be able to bodge rig stuff in order to effect a temporary fix and it seems any bits of knowledge help!
Once again many thanks
Piran

Piran Bassett said:
Hi Bulldog,
thanks for the reply and the info. Regarding charging the unit from the USB port. Does the unit not begin charging as soon as it's plugged in to a USB port? Is there a way to prevent this that you know of? My phone was normally charged for about half it's life from the charger, half from USB.
From what I understand the LI ion batteries don't have a charge memory due to milisecond pulse charging so pardon me for asking but what does the total discharge do for the battery? Obviously it does something but what? (Not doubting you but I'm curious). Is there a away to ressurect a defective battery such as the one I have currently or is it a lost cause. I know some batteries can improve with either heating or cooling by about 20 - 40°C from normal operating temeprature, have you any experience with this?
Do you know if some makes of batteries are better than others?
Please pardon the inquisition but as I spend a lot of time in remote areas it's often quite handy to be able to bodge rig stuff in order to effect a temporary fix and it seems any bits of knowledge help!
Once again many thanks
Piran
Click to expand...
Click to collapse
Hi, I have the exact same problem...works fine when usb or mains connected but only for a few minutes when on the battery. Usually when I give it some heavy task stuff it will suddenly just blank out the acreen and die.
I'm going to try and do what's suggested on the wiki page about masking off the charge indicator contact with tape - run the thing down and charge up again.
otherwise it's a new battery - not expensive - and plenty about on ebay.
fanger

Hi Piran,
Be Frank I am not battery specialist. Therefore I cant give a deep explanation what makes the Universal Battery having so many problems with USB charging. For my understanding it is the slow charge which leads to Battery overheat. Therefore All the post here regarding the Battery problems suggest not keeping the universal charged with USB. Just search for Post for "battery problems" and you will find few "explanations"
In Regards whether you could reverse your battery issue. From my previous experience I would say the max the you can get back is some 10-15%. However in your case the issue seams more severe as you device turns off by 90-100% therefore I think you would need to order new Battery.
following procedure I follow to drain my battery:
1) Turn off You Phone Radio (important)
2) disable the "Turn off Backlight" and put your device brightness to "full"
3) let your device drain the battery by him self( prevent doing anything with your device during this time. I found starting application, touching screen etc. leads that the device request a pick of power which the battery is not able to provide and turns the device off.
4) after certain time your battery will be to weak to keep the device on.
5) push the "power button + backlight button + reset pin" to put your device in to bootloader mode. (your screen will be almost off just some info like SERIAL or Bootloader Version will be visible)
6) again keep the device in this mode to drain as much you can until you cant see anything on the screen.
7) repeat this point6 few times as sometimes the device turns of but after trying again the button combination you can put it back to bootloader.
With above the aim is to drain the battery much as possible. After that you charge your device with power connection for min.12 hours. I guess you will gain few % however repeat the draining and charging procedure for next couple charging cycle to see how much max you will get back.
Good Luck.

I faced the same problem with my battery on Universal.
After a complete drain, the battery wont recharge:
1) Connecting the power cord it starts the boot process, after few seconds the power led ligths in red once, the screen blanks and the boot restarts again and again.
2) Using the usb cord the power led flashes in red without further actions.
I have to throw away the battery, I guess.
Thanks for any comment.

Cesare said:
I faced the same problem with my battery on Universal.
After a complete drain, the battery wont recharge:
1) Connecting the power cord it starts the boot process, after few seconds the power led ligths in red once, the screen blanks and the boot restarts again and again.
2) Using the usb cord the power led flashes in red without further actions.
I have to throw away the battery, I guess.
Thanks for any comment.
Click to expand...
Click to collapse
Cesare, One thing you could try before given up on your battery. Try to Use your power connection to charge for while before starting up your device.

How much is a new battery?

Bulldog said:
Cesare, One thing you could try before given up on your battery. Try to Use your power connection to charge for while before starting up your device.
Click to expand...
Click to collapse
Bulldog, many thanks for your replay.
When I connect the power cord the start up begins automatically.
There is a way to avoid the starting up?

Cesare said:
Bulldog, many thanks for your replay.
When I connect the power cord the start up begins automatically.
There is a way to avoid the starting up?
Click to expand...
Click to collapse
Cesare, you right when you plug in the device it will boot up. However after while (ca.10-15) when the first initialization complete you could go and switch off the screen(with power button) which takes allot power. Anyhow in your case it is really strange as your device behaves like it has no battery at all. there could be 2 things leading to that.
1) your battery is completely dead ( check with a voltmeter to confirm)
2) or something wrong with your Connection clips (battery and device) you could again check with a voltmeter whether you get any juice on those clips.

Bulldog said:
Cesare, you right when you plug in the device it will boot up. However after while (ca.10-15) when the first initialization complete you could go and switch off the screen(with power button) which takes allot power. Anyhow in your case it is really strange as your device behaves like it has no battery at all. there could be 2 things leading to that.
1) your battery is completely dead ( check with a voltmeter to confirm)
2) or something wrong with your Connection clips (battery and device) you could again check with a voltmeter whether you get any juice on those clips.
Click to expand...
Click to collapse
Hi Bulldog.
I think that the 1st one is the rigth hypothesis. I'll check with a voltmeter.
The connection clips are ok because the backup battery works perfectly.
To drain that battery I connected an optical usb mouse until the mouse ligth went off. Do you think that this action is the reason of the death?
Many thanks again

Cesare said:
Hi Bulldog.
I think that the 1st one is the rigth hypothesis. I'll check with a voltmeter.
The connection clips are ok because the backup battery works perfectly.
To drain that battery I connected an optical usb mouse until the mouse ligth went off. Do you think that this action is the reason of the death?
Many thanks again
Click to expand...
Click to collapse
Cesare, your battery my not complete dead but it is to weak to lighten up your Universal. Said that leads to bad thing which is: you can only start to charge battery when the universal has come out of bootloader mode.
I had such case ones, after not using my device for very long time the battery was completely drained, And as you described the device keep booting after plugging to the power. However after certain time ( I think some 15-30min trying) suddenly I was able to start up. I am not sure whether that would help to overcome the booting mode with less power but you could try to take out your sim card and memory card and try booting. ( again not sure it will help)

Guys - a quick update from my previous post.
I was suffering a sudden power outage at about 75%-85% battery power - just a blank screen - power gone. Didn't happen when mains connected, only on battery.
Well, first things first, I thought...dodgy ROM for WM 6 - so I tried a few of them - Ivans, Ranju's and Beastys - no change - still this power out.
Read the posts on this forum and thought - gotta be the battery's fried.
Sooo,
I ordered a new Genuine JasJar battery and installed it - (let it charge for 8 hours) - since then...no problems - no crashes, stalls or blank outs.
I'm running Ranju's 7.4 with spb pocket plus - htc home, etc,
As a point of interest my old battery stated 3.9Volts when I put my meter across it BUT - a voltmeter isn't drawing as much as the universal - when 'under load' from power intensive apps - hence you think you've got a battery putting out the requisite power when you haven't.
This was a real niggly problem to sort out with potential culprits all over the place:
Bad battery?
Bad ROM?
PCB crack?
Hardware Fault?
At the end of the day it's good to have spent £32 or so and simply got rid of the problem totally.
I'd say to anyone who's getting outs or blank outs at 80% power or below - your battery stuffed and no amount of mucking about with ROM swaps, Freezers, charging/ discharging is going to stop it blanking out on you.
I'd also like to say how appreciative I am of this forum with a great deal of knowledge available from so many users across a very broad spectrum of skills and experience. Nice one!
Hope this helps,
fanger

Sign of bad battery?

Have a TMOUS purchased in May. Latest stock rom/radio. When the battery is super low it goes through the process of shutting down - but when I plug it into the charger the phone will boot instead of staying shut down and charge. Will attempt to boot then go into Sense then shut down again and do the same process all over again. The only way to stop it is to quickly power down and it will stay down and charge. In any of the situations the phone appears to be charging.
Is this a problem with the ROM/Hardware or is something going on with the battery? Have an 8GB SD card with Android (no boot loader) and thats pretty much it.
Any advice would be appreciated.

I doubt that your battery is gone bad, but there are chances, try to condition your battery

Its just a little strange that the when the supposedly dead phone is plugged into a charger it boots up without pressing the power button. Don't think thats normal. Also when plugged into a charger when the battery is "dead" or near dead it should boot up and charge. This one doesn't - it boots - shows an LED charge light and then powers down and reboots. For some reason the battery with such a low charge can't power the phone and charge at the same time.
Will attempt to do a hard reset - maybe HD2 Tweak or something else did something to the registry and try it again. Since its under warranty will request another battery and take it from there. Don't think anything is wrong with the phone's hardware because it functions flawlessly.

stim141 said:
Its just a little strange that the when the supposedly dead phone is plugged into a charger it boots up without pressing the power button. Don't think thats normal. Also when plugged into a charger when the battery is "dead" or near dead it should boot up and charge. This one doesn't - it boots - shows an LED charge light and then powers down and reboots. For some reason the battery with such a low charge can't power the phone and charge at the same time.
Will attempt to do a hard reset - maybe HD2 Tweak or something else did something to the registry and try it again. Since its under warranty will request another battery and take it from there. Don't think anything is wrong with the phone's hardware because it functions flawlessly.
Click to expand...
Click to collapse
If the battery drains and shuts off because it's out of juice, it WILL turn back on as soon as you plug it in, but it shouldn't keep rebooting after that...
Also if it's just shutting down on you in Android without warning when it's low, you need to condition your battery in Android so that it has the correct batterystats info.

No something is wrong. Ran it out of juice in WM this afternoon. Got the error message let it go. Went down and shut off. Plugged it into a car charger USB/cig adapter. Powered up go to tmobile screen/radio code then animation - rebooted did the same thing without touching it a few times then shut off - light led for charging did not appear.
Pulled battery - when charger disconnected - plugged charger - red light no reboot. Tried it again - same results with a hitch - it froze when it was charging - accessed internet explorer then it did a hard freeze - had to press reset button.
Don't know whats going on at this point - it shouldn't have done the freeze. So I'm going to experiement - pull the SD card (has Android on it) and try it again without the card. Try another card, try another charger and see - if I get the same results its either the phone or battery. When I have a charge greater than 5% there are never any problems. Only when battery level 0-1%.

stim141 said:
No something is wrong. Ran it out of juice in WM this afternoon. Got the error message let it go. Went down and shut off. Plugged it into a car charger USB/cig adapter. Powered up go to tmobile screen/radio code then animation - rebooted did the same thing without touching it a few times then shut off - light led for charging did not appear.
Pulled battery - when charger disconnected - plugged charger - red light no reboot. Tried it again - same results with a hitch - it froze when it was charging - accessed internet explorer then it did a hard freeze - had to press reset button.
Don't know whats going on at this point - it shouldn't have done the freeze. So I'm going to experiement - pull the SD card (has Android on it) and try it again without the card. Try another card, try another charger and see - if I get the same results its either the phone or battery. When I have a charge greater than 5% there are never any problems. Only when battery level 0-1%.
Click to expand...
Click to collapse
Your battery pins aren't bent are they? (The little guys on the phone side that smash down when you insert the battery)

No, they are fine. I did call T-Mobile this afternoon and spoke to a level 2 tech - they think the battery is bad. Under warranty and have to call HTC tomorrow morning.
The phone does charge and does get to 100%. Drain in Windows seems fine and uniform but it does drop quickly once I get to about 20%.
Because of the reboot issue I think one of the cells is bad. Doesn't seem to want to trickle charge when the battery is that low. Tries to reboot - but can't get enough juice to sustain itself. Should just bypass through the battery as its charging. Either its the battery or somehow the charging circuitry is bad - who knows - with a new battery if it still does it then is the phone's hardware.
Will stop using Android for a while until this gets worked out - although I prefer the browser over WM 6.5.

stim141 said:
No, they are fine. I did call T-Mobile this afternoon and spoke to a level 2 tech - they think the battery is bad. Under warranty and have to call HTC tomorrow morning.
The phone does charge and does get to 100%. Drain in Windows seems fine and uniform but it does drop quickly once I get to about 20%.
Because of the reboot issue I think one of the cells is bad. Doesn't seem to want to trickle charge when the battery is that low. Tries to reboot - but can't get enough juice to sustain itself. Should just bypass through the battery as its charging. Either its the battery or somehow the charging circuitry is bad - who knows - with a new battery if it still does it then is the phone's hardware.
Will stop using Android for a while until this gets worked out - although I prefer the browser over WM 6.5.
Click to expand...
Click to collapse
Def sounds like a battery issue then, if the pins aren't bent because that is the biggest symptom of bent pins.

Red light of death after Antutu Benchmark

The title pretty much explains it.
My N4 died on me today after running an Antutu Benchmark. I was running on Android 4.4 with the latest Fauxkernel (v29).
I can't boot it up anymore without the charging cable plugged in. When the charging cable is plugged in, the LED flashes red once, the display turns on and shows me the battery charging indicator and turns off just a couple seconds later also with the LED flashing red once. If I attempt to turn it on, the Google sign appears but the phone turns off immediately after that and once again, say Hi! to the red LED.
Pretty much tried everything so far, charging my battery, getting into the recovery menu, pushing down the power+VOL Up buttons for 60 seconds, etc. Nothing helped.
Maybe you guys know any way to fix it? I don't wanna open my device nor replace the battery if possible.
Thanks in advance.

2 ways to fix it. first, leave your phone on the charger for 3-4 hours. thwn try to boot it into the bootloader and press turn off the phone. let it charge further. if that doesnt work, remove the back cover, remove the battery, then clip the battery back in. the second method works 100%.

simms22 said:
2 ways to fix it. first, leave your phone on the charger for 3-4 hours. thwn try to boot it into the bootloader and press turn off the phone. let it charge further. if that doesnt work, remove the back cover, remove the battery, then clip the battery back in. the second method works 100%.
Click to expand...
Click to collapse
I can get into the bootloader but once I select power off, the phone just turns on again and shows me the battery charging indicator. Not sure if it's supposed to be like that but the indicator is completely filled so that would probably mean the battery is full.
Not sure if I have the right screwdrivers to open the back.

xSalamanderman said:
I can get into the bootloader but once I select power off, the phone just turns on again and shows me the battery charging indicator. Not sure if it's supposed to be like that but the indicator is completely filled so that would probably mean the battery is full.
Not sure if I have the right screwdrivers to open the back.
Click to expand...
Click to collapse
the reason for rlod is that the phone thinks that it is under 0% battery. leave it on the indicator that is filled, thats a good start. when that filled indicator starts the reguler behavior that it looks like its filling(up and down), thats when your phone will be fixed. leave it charging for a few hours.

simms22 said:
the reason for rlod is that the phone thinks that it is under 0% battery. leave it on the indicator that is filled, thats a good start. when that filled indicator starts the reguler behavior that it looks like its filling(up and down), thats when your phone will be fixed. leave it charging for a few hours.
Click to expand...
Click to collapse
Alright, I'll try that out. It's kinda annoying though that the display turns on every few seconds and turns off again but if it's going to work later that'll be worth it. Thanks alot!

if worst comes to worst, remove the battery and plug the battery back in. this will "reset" the battery(like a normal battery pull for devices with a removable battery).

seems the post may drive users a mis-understanding to AnTuTu Benchmark, I will ask our engineer to double check.

[Q] Nexus 4 bricked? Tried everything.

12.

Not everything my friend
Just charge the battery for some HOURS or over the night. All the described symptoms indicate a low battery to me.
cheers

UPDATE:
Just managed to unlock a bootloader in that short period of time i can get to fastboot. But still no change, phone wont stay in fastboot.

greg17477 said:
Not everything my friend
Just charge the battery for some HOURS or over the night. All the described symptoms indicate a low battery to me.
cheers
Click to expand...
Click to collapse
Well, i actaully tried to leave it plugged over night. But i think it stops charging right after the red light dissapears, which happens after 15mins or so after plugging. Btw, i mentioned earlier that battery shows 3.7V when measured with multimeter, so the battery doesn't seem to be the culprit... or does it...?

12

your battery is drained below safe line....to 0%. They warn you NOT to update it with less than 60% battery FOR A REASON!!
Friends case she managed to charge ger asus 7 memopad with non-removable bat to 60% after 8 HOURS, because of a bloatware wakelock drainage to 0% after a factory reset....
If that doesn't work you have to either recharge the battery manually (something like car batteries, you have to unsolder the battery connector because the battery doesnt have 2 gold squares that touch the gold pins like the removable ones, or get a new battery.
Li-Po batteries should never be discharged to 0%, and can make problems if they are not removable (Nexus 4)

Mashed_Potatoes said:
your battery is drained below safe line....to 0%. They warn you NOT to update it with less than 60% battery FOR A REASON!!
Friends case she managed to charge ger asus 7 memopad with non-removable bat to 60% after 8 HOURS, because of a bloatware wakelock drainage to 0% after a factory reset....
If that doesn't work you have to either recharge the battery manually (something like car batteries, you have to unsolder the battery connector because the battery doesnt have 2 gold squares that touch the gold pins like the removable ones, or get a new battery.
Li-Po batteries should never be discharged to 0%, and can make problems if they are not removable (Nexus 4)
Click to expand...
Click to collapse
I did manage to charge it manually with two small wires and an old Nokia charger, when checking battery with multimeter after a few minutes of charging seems to increase voltage. But i guess if the chip on battery is fried there is nothing more i can do.
I will try to leave the phone on charger all night once again, see if that makes a difference, and update if anything changes.

take off the back, disconnect the battery connector wire and connect it again, put it on charger and see if things change

UPDATE:
Leaving it to charge overnight didn't have any effect. Any other suggestions than changing a battery?

Nah, sorry, but i am out of ideas. You basically tried it all :/

Darkis said:
I know there is a lot of threads about bricked N4's, and i can assure you that I have viewed each and every one of them, but i still can't resolve my broblem.
This whole brick situation happened after trying to update to Android 4.3 OTA update, the phone didn't complete the process and turned off, where red light of death happened.
So the scenario goes like this:
If i hold POWER button for ~30s when phone is off charger i only get a Google logo for 2 sec, and phone instantly restarts
Holding PWR+VOL-DOWN buttons when phone is off charger doesn't do anything
Plugging phone to charge (socket or PC) results in solid red light
Holding PWR+VOL-DOWN or PWR+VOL-DOWN+VOL-UP for ~15s makes the red light blink at a steady rate
While continuing to hold the respective buttons and pluging the charger off, and on again gets me to bootloader or download mode (depending on button combo) for ~2s and phone restarts.
I tried removing and inserting the battery 3 times. One time i got blinking red light when plugged the charger in. Second time i got solid red light and third time got solid red light again
I tried charging the battery directly for 15 minutes with old Nokia charger, and it resulted in something different(when i assembled the phone and tried to turn it on with PWR+VOL-DOWN buttons when charger was plugged off, i got to bootloader for 2seconds before phone restarted, i tried to boot second time and the same thing happened, but when i tried it third time i got nothing, just like before) so this was the first time i got into bootloader while not charging a phone.
*My PC seems to pick up the phone for a brief moment when it is in bootloader and starts installing the drivers. Drivers gets installed when i'm in download mode for that brief moment too.
**Phone doesn't get to the white or red battery icon while plugged to charge.
***Solid red light dissapears after charging for ~10mins, but phone won't do anything.
****When measured with a multimeter battery shows 3.7V
I hope someone will be able to help me with this, as it is frustrating as f*ck. I don't have a working warranty, so fixing the N4 isn't an option, and where i live phone repair prices are over the roof (ex. motherboard change for N4 costs ~270$ ).
Click to expand...
Click to collapse
I had the same problem. Kept it on the charger for a whole day and still only the Red Light.
Took it to a local shop and they said there is a short circuit in the antenna
Took it to the LG Service center and they said my motherboard is gone.
Both were costing a bomb to repair and still there was no guarantee.
IMHO, get a new phone.
Sorry

Have you tried charging it with a wireless charging pad? I got mine to boot after I did that. Your battery is drained and it doesn't have enough juice to charge itself.

12

Don't fall for the motherboard dead trick. Just a way to steal your money.... change the battery and never let it go to 1%

12

Cycling in the starting of charging process

I have an ASUS ZenFone Max Pro (X00T/X00TD)
It is/was discharged and powered off. When i plug it in for charging, it is cycling in start of chaging:
1. vibration
2. the icon of empty battery
3. The bootloader is unlocked... text
4. the icon of empty battery
5. empty screen
1. and then starts again from vibration
I tried to clean the phone's connector, even wiped and stracthed the connector a littlebit, and changed cable, charging source. (One cable is in the 1A charger, another cable is connected to PC.) It doesn't get better.
I tried to leave it in the cycling, i hoped it gets some power.
Does the phone charge always when connected to power, or it just start the charging process after it shows the charging animation (which i don't reach)?
I tried to step in Fastboot mode. It stays in this mode, no cycling.
Does the phone charge in fastboot mode?
I tried to step in Recovery mode.
1. vibration
2. powered by android
3. The bootloader is unlocked... text
4. powered by android
5. empty screen and turns off
In fastboot mode i tried to flash stock recovery, and also TWRP recovery. The flashing process works, but i still cannot get in recovery mode, to see something more, maybe about battery or i dont know.
Of course the phone does not turn on. The same as when i try to get in recovery mode.
1. vibration
2. powered by android
3. The bootloader is unlocked... text
4. powered by android
5. empty screen and turns off
I did not do anything special nowadays with the phone. Bootloader unlock and rooting was years ago, nor i did upgrade, so nothing special. I just used the phone, it discharged, and i'm in this state.
What can i do? Is it something with charging, or it has enough power after connected in fastboot mode, but the problem is something with the software?
Please help.

Was it discharged until it turned off or left more then a few weeks in a very low charge state?
Auto shutoff is about 5-6% of battery capacity.
If allowed to sit until it self discharges below 1% the battery's microprocessor will permanently disable the output to prevent a possible runaway thermal event from charging a depolarized LI cell(s).

blackhawk said:
Was it discharged until it turned off or left more then a few weeks in a very low charge state?
Click to expand...
Click to collapse
It discharged today morning, turned off (or maybe i turned it off, i don't remember), and about one hour later i tried to charge.
blackhawk said:
If allowed to sit until it self discharges below 1% the battery's microprocessor will permanently disable the output to prevent a possible runaway thermal event from charging a depolarized LI cell(s).
Click to expand...
Click to collapse
Does it mean really permanently, without any possibility of get it back?
One more thing: maybe i "pressed" the buttons randomly in my pocket. Is it possible that in an unlucky situation i got into the recovery mode and pressed something away in recovery menu?

Even if discharge to the 6% cutoff you have at least a few weeks in cool temps until permanent auto shutdown.
It is permanent. If disassembled you could bypass the controller and attempt to charge.
Once the cell voltage reaches the controller threshold (if it takes a charge) it would function as before. Generally this is impractical to do.
If the cell has completely dipolarize it may not charge and will simply overheat with a potential thermal runaway if not manually disconnected.
Inspect port for debris, clean if needed.
Try a -known- good charger/wall socket and cable.
Normally phones will take a charge regardless of their power on/off state.
Otherwise the port, battery or the internal phone power control circuit may have failed.
A cable, charger, port failure are the most common causes though.
Best to use a 3 foot long cable; longer ones can cause charging issues.

blackhawk said:
Even if discharge to the 6% cutoff you have at least a few weeks in cool temps until permanent auto shutdown.
It is permanent.
Click to expand...
Click to collapse
It was definitely not a few weeks.
blackhawk said:
Inspect port for debris, clean if needed.
Click to expand...
Click to collapse
Sure, this was the first thing i checked. I also tried to carefully scratch off the possible oxid/dirt layer with a paper clip's end.
blackhawk said:
Normally phones will take a charge regardless of their power on/off state.
Otherwise the port, battery or the internal phone power control circuit may have failed.
A cable, charger, port failure are the most common causes though.
Best to use a 3 foot long cable; longer ones can cause charging issues.
Click to expand...
Click to collapse
So should i try to leave it in the cycle? Or better leave it in the fastboot state?
Hm. But i tried to charge in fastboot state for a few hours.
I don't understand.
blackhawk said:
Otherwise the port, battery or the internal phone power control circuit may have failed.
Click to expand...
Click to collapse
Yesterday with a third charger everything was fine. And this charger was fine, last time i used it two weeks ago. I tried to charge in my car now - the same cycling of starting to charge.
Okay, so i keep trying to charge, if you don't have better ideas.
But why does not it go into recovery mode? Maybe i could inspect the things more in recovery mode.
Thank you very much for your detailed answers.

If the battery is nearly fully discharged ie >5-6% and not recieving enough current or voltage from the cable, it will not power up even to its boot menu.

blackhawk said:
If the battery is nearly fully discharged ie >5-6% and not recieving enough current or voltage from the cable, it will not power up even to its boot menu.
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But it should start to charge without cycling, and show the charging animation, right?
Edit #1: Ah, you mean, IF enough current. And if three different charger and cable was not enough for it, then probably the connector damaged. But i don't know how and why.
Edit #2: No, you mean this for booting up. But charging should start normally without the cycling.

trob83 said:
But it should start to charge without cycling, and show the charging animation, right?
Edit #1: Ah, you mean, IF enough current. And if three different charger and cable was not enough for it, then probably the connector damaged. But i don't know how and why.
Edit #2: No, you mean this for booting up. But charging should start normally without the cycling.
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Your first concern is getting the battery to at least 60%
That's why you use a known good wall socket, cable and charger; a process of elimination.
I've had 2 bad power cables in a row before; more bad cables, etc. doesn't help.
For the boot issues someone here will hopefully recognize your problem if it persists.

blackhawk said:
I've had 2 bad power cables in a row before; more bad cables, etc. doesn't help.
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Yes, i threw out a bad cable last week. But these 3 cables were good, there is not a big chance that all of them get wrong suddenly and at the same time, i think. I would be happy, because this would be the most easy solution for my problem.
In fastboot the red/green LED is dark, even if the cable is plugged in. Is this LED controlled directly also by the charging controller? Or does not the dark LED show anything, because it controlled by software, what does not run now, while the charging still work?
Or maybe both of charging start cycling and fastboot are use power of battery, while they don't charging it, so power is only getting lower? (Although you said the opposite, as phone is charging, not matter of the power state.)

Could be a bad batch if all are the same brand.
That's why you use a >known< good cable etc.
Don't have that phone so can't say how it behaves.
If it's below 5% power it won't do anything except maybe try to boot maybe not even that. Plus each attempt drains the battery more towards that critical 1% auto disable in the Li pack.
Killing the battery won't help your cause...

blackhawk said:
That's why you use a >known< good cable etc.
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Okay, i try.
Thank you very much for your help.

Is it possible to turn off the charging screen, charging vibration, screen turning on from fastboot mode? Maybe flash something on or similar?
Because then it won't use the slowly chagring power.

So the screen is active abnormally when it's charging?
Is it stuck in a boot loop?
I know zero about rooting and firmware flashing.
Eventually someone here with that knowledge will step up... be patient.

blackhawk said:
So the screen is active abnormally when it's charging?
Is it stuck in a boot loop?
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1. I plug the cable in.
2. It recognize there is power, so vibrates a littlebit, then starts to charge OR starts to start to charge - it would be in important thing to know which.
3. It shows the big battery icon at the center of the screen.
4. It notices its boot loader is unlocked, so it warns me - i can pause the phone for one minute in this step.
5. It shows the big battery icon at the center of the screen for a second.
6. But i think it feels its battery is too low, so it turns itself off, even from the charging process.
2. Then it feels the power again, so the cycle starts again and again...
In step 2., if i would know it is already charging itself, then i played with it, i pause every time for a minute, and everytime the battery gets a little more power. Because every vibrate and starting charging take a littlebit power from the battery i think.
So, for example, in every unpaused charge cycle (about 10 seconds) it gets 5 mAh, but uses 7mAh from the battery, then it get worse and worse. But if i pause it for a minute, it gets 30mAh, uses 7mAh, then every minute it gets 23mAh more, so this game eventually worths.
But, if in step 2. it does not start to charge itself, just later, after the "unlocked" text, then playing with this does not help, worse, take the battery lower and lower.
But: if i could disable the charging screen and the vibration, then it won't use the power just for showing to me it charges. And maybe the screen is the one who use the power and makes the controller feel low power from battery/cable.
Or, maybe, charging is already disabled, so no matter what i do, it does not help, and the only solution is to take apart and charge the battery directly.
I just put
blackhawk said:
Eventually someone here with that knowledge will step up... be patient.
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Okay i try to be patient.

Good news!
This gets the voltage of the battery:
Code:
fastboot getvar battery-voltage
It says it's 4,32 V. If i remember right, this is around a fully charged battery. So probably it charged up when i left in Fastboot state for some hours. And the cycle/loop meant not that it cannot charge, but rather it does not need to charge.
Bad news!
Then what the heck is with my phone?
Summary:
1. My phone is fully charged.
2. It does not boot into normal.
3. It does not boot into recovery, nor by hardware keys, nor by command from fastboot. I tried to flash TWRP, RedWolf and the original recovery too.
4. Fastboot mode works normally.

Believe it or not...
The solution was very stupid.
I cleaned the phone inside, especially the bottom part. Around the connectors, lot of dirt and drying moisture got in. Just enough for - probably - some short circuit.
I don't know why was it okay for fastboot mode, and not okay for recovery and normal boot.
Blackhawk, Thank you soooooo much for your help and your time. I learned a lot from you now.

Excellent.
Guess it was getting mixed signals...