Hi all
I dont pertain to be an expert on the HD2 yet, but thought i would share a little idea i have had with some promising results so far.
Most of you will know that a LiIon battery has a small circuit contained within it which acts as a charge / discharge regulator and the "fuel guage" for the device. Occasionally these need to be "recalibrated" to give a more accurate representation to the main device about charge levels.
Generally this is achieved by allowing the device to consume power constantly until the point is reached when the regualtor circuit cuts power, to prevent the battery from going into a potentially damage deep-discharge state. Followed by a full charge.
However, i believe that the HD2 only reads the "fuel guage" level of the regulator circuit, and shuts itself off rather than just drawing power and relying on the regulator to cut power. This is probably as a means of protecting against data loss.
Mine was only delivered yesterday, and had an apparent charge level of 32% from the box. not bad i thought, and i left it to consume away and turn itself off, which it promptly did, 2 hours later (i was using it ALOT). So i charged it overnight. Today it lasted about 13 hours, again with a great deal of use. but then i had an idea.
Knowing that the Boot loader screen is a simple loaded program, lets say similar to a BIOS, and that it serves no function if given no input, i wondered if it would, and for how long continue to be powered by the supposedly dead battery in this way.
4 hours later, with no charge, im still on the tri-colour bootloader screen !!!
This means that:
-MY battery was badly calibrated
-The HD2 thought there was much less capacity in the battery than there really was, or ignores the regulators "fuel guage" and uses its own even worse calibrated one
-My battery is in good condition
I intend to leave it in bootloader mode until the regulator shuts it off, and then give it a full charge in a turned-off state. That should ensure that the battery regulator gets correctly recalibrated and, in theory, i should get better battery life.
I will report back my results
Thanks for reading,
Gavin
That might not be a good idea, have a read of this
http://www.batteryuniversity.com/partone-12.htm
over discharging lithium ion isn't very good for it, ,
yes, but thats what the batteries regulator circuit does anyway. the phone cant draw any more than what the regulator will give it. the regulator will never let a LiIon to get to a damaging discharge state.
anyway, i measured the battery with a multimeter when the leo shut off. voltage was a nominal .15v out of spec for the battery, well within design limitis of a lithium cell.
g.lewarne said:
yes, but thats what the batteries regulator circuit does anyway. the phone cant draw any more than what the regulator will give it. the regulator will never let a LiIon to get to a damaging discharge state.
anyway, i measured the battery with a multimeter when the leo shut off. voltage was a nominal .15v out of spec for the battery, well within design limitis of a lithium cell.
Click to expand...
Click to collapse
Hmm fair enough then, be good to get some more time out of the cell. cant really complain, but 3g munches battery!
samsamuel said:
Hmm fair enough then, be good to get some more time out of the cell. cant really complain, but 3g munches battery!
Click to expand...
Click to collapse
ironically, 3g should actually be easier on a battery, as the Tx/Rx power levels are lower. whats kills battry on modern phones is the constant radio switching from 2g to 3g. when its hunting for a signal the transmitter is on MAX.
g.lewarne said:
yes, but thats what the batteries regulator circuit does anyway. the phone cant draw any more than what the regulator will give it. the regulator will never let a LiIon to get to a damaging discharge state.
anyway, i measured the battery with a multimeter when the leo shut off. voltage was a nominal .15v out of spec for the battery, well within design limitis of a lithium cell.
Click to expand...
Click to collapse
WOW!! I never thought a battery could cause so much bother!
however i think this is interesting, but i agree that overdischarging a LIon cell is not a good thing to do as it causes unnecessary stress to the cell!
Personally when my HD2 turns off i accept that there is no longer power for the device to run and fully charge. I understand your point about the bootloader not drawing power(much) but why bother discharging in bootloader?
at the end of the day, if the batt cannot support the screen and the snapdragon then it is discharged!
MG
This experiment may calibrate the fuel gauge in the battery.(if it was designed to have one).
But one thing i would like to know is the backlight on during the 4 hours in tricolor screen?
Because in that state when the backlight is off, cpu is idle, and radio is off. I believe the energy comsumption is extremely low you can leave it for days.
ahdai said:
This experiment may calibrate the fuel gauge in the battery.(if it was designed to have one).
But one thing i would like to know is the backlight on during the 4 hours in tricolor screen?
Because in that state when the backlight is off, cpu is idle, and radio is off. I believe the energy comsumption is extremely low you can leave it for days.
Click to expand...
Click to collapse
The boot loader withbacklight remained on for over 6 hours in the end.
The battery most definatly does have a regulator in it (i took a spare one apart) and therefore doing this will cause no harm to the battery.
Anyway,
I did a full unpowered charge overnight. Turned it on at 7am this morning, and have been using it almost constantly for 3 hours now and im on 79%. that seems to be a little better i think.
will provide further updates as i go along!
g.lewarne said:
Hi all
I dont pertain to be an expert on the HD2 yet, but thought i would share a little idea i have had with some promising results so far.
Most of you will know that a LiIon battery has a small circuit contained within it which acts as a charge / discharge regulator and the "fuel guage" for the device. Occasionally these need to be "recalibrated" to give a more accurate representation to the main device about charge levels.
Generally this is achieved by allowing the device to consume power constantly until the point is reached when the regualtor circuit cuts power, to prevent the battery from going into a potentially damage deep-discharge state. Followed by a full charge.
However, i believe that the HD2 only reads the "fuel guage" level of the regulator circuit, and shuts itself off rather than just drawing power and relying on the regulator to cut power. This is probably as a means of protecting against data loss.
Mine was only delivered yesterday, and had an apparent charge level of 32% from the box. not bad i thought, and i left it to consume away and turn itself off, which it promptly did, 2 hours later (i was using it ALOT). So i charged it overnight. Today it lasted about 13 hours, again with a great deal of use. but then i had an idea.
Knowing that the Boot loader screen is a simple loaded program, lets say similar to a BIOS, and that it serves no function if given no input, i wondered if it would, and for how long continue to be powered by the supposedly dead battery in this way.
4 hours later, with no charge, im still on the tri-colour bootloader screen !!!
This means that:
-MY battery was badly calibrated
-The HD2 thought there was much less capacity in the battery than there really was, or ignores the regulators "fuel guage" and uses its own even worse calibrated one
-My battery is in good condition
I intend to leave it in bootloader mode until the regulator shuts it off, and then give it a full charge in a turned-off state. That should ensure that the battery regulator gets correctly recalibrated and, in theory, i should get better battery life.
I will report back my results
Thanks for reading,
Gavin
Click to expand...
Click to collapse
Well,
just for the sake of experiment, I tried your method.
My screen did not stop at the tri-color screen, but went to the white screen that sais to press <volume up> if you want to reset the device.
It stayed in that screen for about 10 minutes, and shut off.
Re trying it - just caused the device to turn on and immediatly turn off,
just showed the tri-color screen, switched to the white screen, and turned off.
BUT -
Maybe that is because my battery is already calibrated correctly . . .
since when I got the device, what looked like the logical thing to do was -
NOT to charge the battery, but, first - totally drain it, and only then - re-charge.
I've tried as well.. drained the battery by letting it play some videos untill it died.. then started up in boot mode but it died after about 5 minutes.. it's charging now on usb power.
for the record.. it was at 47% and I watched two episodes of the sopranos before it died on me..!! I think that's pretty good already.. I guess my battery was also calibrated quit good already.. but I did the oposite.. I charged it before I powered on the device the first time, but I did let it drain almost fully before charging it the first few days..
But I think you might be on to something why some people have poor battery performance...?
hey guys!
how do i get to the bootloader screen again? how do i make it stay there for the time being?
thanks
kweiss10 said:
hey guys!
how do i get to the bootloader screen again? how do i make it stay there for the time being?
thanks
Click to expand...
Click to collapse
First - back up all your data (just in case)
Then power off the device.
Hold BOTH volume Up and Down (at the same time)
and Tap the power button.
Leave it with the "press volume up to delete or any other to abort" question on the screen, until it shuts off.
Som30ne said:
First - back up all your data (just in case)
Then power off the device.
Hold BOTH volume Up and Down (at the same time)
and Tap the power button.
Leave it with the "press volume up to delete or any other to abort" question on the screen, until it shuts off.
Click to expand...
Click to collapse
That's actually to start a hard reset (hence the "press volume up to delete...")
To get into the bootloader, with the phone powered off, press and hold the volume down and the power key, after a few seconds you'll see the tri-colour screen.
Isadora said:
That's actually to start a hard reset (hence the "press volume up to delete...")
To get into the bootloader, with the phone powered off, press and hold the volume down and the power key, after a few seconds you'll see the tri-colour screen.
Click to expand...
Click to collapse
Oh . . .
Thanks for the correction.
so we found 576 mb ram, than clocked snapdragon to 1Ghz, maybe we will found 1gb rom, than fm transmitter, than 50% extra battery, next maybe will be tmc... i`m just wondering, if we can find correct drivers for ''transformers'' mode
where is the thread about clocking snapdragon tio 1ghz?
tboy2000 said:
where is the thread about clocking snapdragon tio 1ghz?
Click to expand...
Click to collapse
i think it is included in eugenia rom...
Related
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
Guys pls help..I have this problem,that when I'm charging my trinity,it couldn't reach 100% of charging (full charge) instead was stuck to 70%.eventhough i charge it overnight.I'm thinking if it is a battery prob or the charger. i am using the originally supplied charger & battery.
Thanks in advance...
Have you tried powering the unit off, removing the battery for, say, 15 seconds, then refitting it and rebooting?... Check the battery level after reboot?... Then retry charging again?...
Maybe a full discharge might help "reset" the above problem too?...
I'm not sure, but I think the Trinity battery management is quite dependant on so called "coulomb counting" and I reckon sometimes it goes a bit wrong.
LoopyLoo said:
Have you tried powering the unit off, removing the battery for, say, 15 seconds, then refitting it and rebooting?... Check the battery level after reboot?... Then retry charging again?...
Maybe a full discharge might help "reset" the above problem too?...
I'm not sure, but I think the Trinity battery management is quite dependant on so called "coulomb counting" and I reckon sometimes it goes a bit wrong.
Click to expand...
Click to collapse
i tried all your suggestion bro,after rebooting,the battery meter increased 10%,tried to recharge,but still can't reach full.i tried to turn off my device then charge it,this time it goes upto 90%.it's a good sign but,charging while my phone is turned on is better right?i have no computer around,maybe i'll try to charge thru USB later..if it went ok,maybe i'll buy a new charger..thanx loopyloo for that sound advice..
tranquil20 said:
i tried all your suggestion bro,after rebooting,the battery meter increased 10%,tried to recharge,but still can't reach full.i tried to turn off my device then charge it,this time it goes upto 90%.it's a good sign but,charging while my phone is turned on is better right?i have no computer around,maybe i'll try to charge thru USB later..if it went ok,maybe i'll buy a new charger..thanx loopyloo for that sound advice..
Click to expand...
Click to collapse
Try battery callibration procedure!
The actual standalone charger (if that's what you're referring to) has no intelligence in it to speak of. Battery charge monitoring/status will be an integral function to the phone itself using dedicated h/w.
Something's not quite right with your kit somehow. Maybe the battery has gone a bit wrong (could be replaced - how much use has it had?)... Rather that than the phone itself, in which case it'll need repair.
You can try tnyynt's suggestion of Battery Calibration. Basically this requires you to totally discharge the battery (I suggest thru normal use of your phone!) then when it shuts down "cos battery is flat" reboot the phone into its bootloader screen (power down, then press and hold Power & Camera buttons until Tri-colour screen is displayed)... Then just leave the phone until it powers off of its own accord.
This may take a few hours (I did mine recently and it took @4hrs!) but the battery should be as discharged as its possible to get by that point...
And if you're lucky, it might just sort your problem out when you next recharge!
Good luck dude!!!
;-)
LL
tnyynt said:
Try battery callibration procedure!
Click to expand...
Click to collapse
i tried to use charging thru pc and it charged 100%,but again,as i tried to charge using a friend's htc charger,still stuck at 70% charging...will try this battery callibration procedure tnyynt,thanx 4 the suggestion..
LoopyLoo said:
The actual standalone charger (if that's what you're referring to) has no intelligence in it to speak of. Battery charge monitoring/status will be an integral function to the phone itself using dedicated h/w.
Something's not quite right with your kit somehow. Maybe the battery has gone a bit wrong (could be replaced - how much use has it had?)... Rather that than the phone itself, in which case it'll need repair.
You can try tnyynt's suggestion of Battery Calibration. Basically this requires you to totally discharge the battery (I suggest thru normal use of your phone!) then when it shuts down "cos battery is flat" reboot the phone into its bootloader screen (power down, then press and hold Power & Camera buttons until Tri-colour screen is displayed)... Then just leave the phone until it powers off of its own accord.
This may take a few hours (I did mine recently and it took @4hrs!) but the battery should be as discharged as its possible to get by that point...
And if you're lucky, it might just sort your problem out when you next recharge!
Good luck dude!!!
;-)
LL
Click to expand...
Click to collapse
thanx again LoopyLoo,you made this procedure (battery callibration) clear to me,on how to do it.will try this procedure and will report asap the result.hope it works (fingers crossed),and hope it's not an internal phone prob.
Thanx Bro!!:>
Let me know how you get on.
I'm a little baffled as to why you have problems with your friends charge too but not USB???...
battery callibration not worked...
I'm sorry to report that after 3 times of trying the battery callibration method,my trinity still doesn't reach its 100% capacity of charging thru the standalone charger..but mysteriously charge a 100% with USB charging..I'm still not really sure why this happened..maybe will try to see a mobile technician for PPC..anyways,thanx for all your suggestion..will report ASAP after going to a service center..
Anyone out there notice that on a completely full charge using the AC charger, the minute you pull out the charger, the batt indicator on the TAB will drop to 99% ? The 100% only last a couple of seconds!!! No apps running , wifi, BT, GSM is all off.
Is this normal ?
Yup. Same thing happens here. I think it's normal. Same thing happens with my mobile phone.
Thanks.. but this never happens to my mobile phones and that includes Samsung Omnia, Omnia II and Omnia Pro..
As soon as i pull my plug i am showing 98%.
Yep, I was wondering that too. It goes straight to 99%. I guess it's some bug, it doesn't really go to 99%
It's just rounding down, but think about it:
The moment you unplug it, you're consuming battery power.
If you've consumed any battery power, it can't be at 100%, now can it?
I really don't see the problem with it dropping to 99% .. really i don't !!
Croak said:
It's just rounding down, but think about it:
The moment you unplug it, you're consuming battery power.
If you've consumed any battery power, it can't be at 100%, now can it?
Click to expand...
Click to collapse
SMARTA$$
sorry guys stupid question. How can i check battery %?
pda_crazy said:
sorry guys stupid question. How can i check battery %?
Click to expand...
Click to collapse
Any number of ways, but I have been using the "Batterylife" widget from curve fish on the market.
Thanks i installed it. I noticed that my battery drains quiet quickly, my tab was in stand by mode for 30 to 45 min and i battery drains by 9%. I just bought it this afternoon could please guide.
Sent from my GT-P1000 using XDA App
cmloo said:
Anyone out there notice that on a completely full charge using the AC charger, the minute you pull out the charger, the batt indicator on the TAB will drop to 99% ? The 100% only last a couple of seconds!!! No apps running , wifi, BT, GSM is all off.
Is this normal ?
Click to expand...
Click to collapse
With a lot of android devices the battery is not calibrated with the system, there was a post on how to do this with a nexus one. i used it on my vibrant and it worked the same. it was a series of steps like plugging the phone in, powering off, powering on, unplugging again, weird stuff like that. and it actually works. sorry i dont know where the post is or the exact steps to do.
donniestarko said:
it was a series of steps like plugging the phone in, powering off, powering on, unplugging again, weird stuff like that. and it actually works. sorry i dont know where the post is or the exact steps to do.
Click to expand...
Click to collapse
I did this for my captivate and works well:
1. Connect the phone to the charger with the phone powered on, and allow the phone to charge until it shows 100%
2. Disconnect the phone from the charger, and power it off.
3. Reconnect the phone to the charger with the phone powered off, and allow the phone to charge until the battery indicator shows 100% (you can use vol-up/vol-down to make the indicator come back up when the screen goes to sleep).
4. Disconnect the phone from the charger and power it on.
5. Once the phone is powered completely on, power it off again and reconnect it to the charger until the battery indicator shows 100%.
6. Disconnect the phone, power it on, and use it.
Hey, it doesn't happen to me so you must have something else going on.
The only thing that matters is how long the battery lasts between charges.
The percentage of charge shown on a battery gauge widget is meaningless unless the battery is draining abnormally in relationship to the way the tab is being used.
I find that my tab drains from 99% to 60% in about 2.5 hours with wifi on, GPS on, bluetooth off. It then takes another 4.5 hours or so to drop from 60% to about 10% under the same conditions. So... 7 hours of continous wifi on web browsing isn't much to complain about.
Croak said:
It's just rounding down, but think about it:
The moment you unplug it, you're consuming battery power.
If you've consumed any battery power, it can't be at 100%, now can it?
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LMAO!!!!
He DOES have a point.
Croak said:
It's just rounding down, but think about it:
The moment you unplug it, you're consuming battery power.
If you've consumed any battery power, it can't be at 100%, now can it?
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exactly..
Most modern electronic devices on Li-ion batteries do this. When the device reaches 100%, it will stop charging to prevent damage to the battery. The battery then drains to 90-95% and the charging circuit allows the battery to charge again. Most systems hide this by displaying the battery level at 100 or 99% for a while after the device is unplugged. Hope this helps!
Ok I've not seen any threads quite like my issue, so I'll try to explain best I can. Ok, here I have an N7 (2012) wifi. Now, I work in electronics therefore know a bit about charging etc, so I've got the back off it to measure the voltage directly at the battery terminals. I have 4.2V across it - which is about as high as you want a 3.7V cell to reach at full charge. Also the unit (powered off or on, with screen off) is drawing about 17mA from my bench PSU (set to a 2.5A limit, @ 5.25V), which is what I'd expect of a full battery, along with the fact it's up at 4.2V.
However, and this is the bizarre bit - unplug it, and the unit bleats away saying there's 5% battery left. So, back in with the power, it says charging. Leave the screen to go off. Check it about an hour later, the unit isn't switched on. Boot it up, it bleats again saying 2% left. Take out the power and put it back in. Charging again (allegedly). So I look in the battery section of settings to see what had occurred over this last hour or so... and according to the graph, while I had left the unit to charge, it rose from 5% to 15% over a period of around half an hour, then steadily DISCHARGED for the next half hour right down to 0, and switched off !! Situation now - it's "charging", and has been sat at 2% for about two hours. However, as expected, on another battery check, guess what - still at 4.2V - fully charged, about where it has been throughout. Well the lowest I saw it go was actually 4.13V.
Any help would be appreciated here, as I can't see what the problem is, other than the battery is full and the os thinks it's empty. It was doing this on android 4.2, and I've since updated it to 4.3, and then 4.4.2. Same results, no change. I've also performed a factory reset via the os, and a hard reset (factory wipe/reset) via recovery. This is really strange, never come across this ever before. As I say, I've seen lots of battery issues experienced by N7 2012 owners, but nothing quite this odd!
Here's a screenshot of this evening:
Stranger and stranger. Long spell of charging, then it goes straight to 0%. So I leave it turned off for a while (not connected to charger), then turn it back on and miraculously it now has 32%! Which then jumps straight to 0 a few mins later. Now switched back on again, and it's back up to 24%!! See attached.
Bizarre.
Your situation is unusual, for sure. I had a situation where a rogue app consumed power faster than my N7 charger could supply it. Killing the app stopped the madness. Have you checked battery usage?
I would reinstall your ROM, as corrupted software seems to be the likely cause.
First thing I would check before messing with reinstalling ROMs or similar actions, is take the back off the device, and ensure the battery plug is firmly seated and not loose or crooked.
I had similar erratic behavior pop up all of a sudden, and this was the culprit.
Yep done that, it's on official 4.4.2, also done a factory reset and a hard reset, neither made a difference. The thing is, the battery voltage is around 4.1 to 4.2V at all times, indicating it's fully charged. Checked connector as well, no loose connections at all. Very odd indeed.
When I first got my nexus 7 1 year ago
I got the same problem
Then I found out it was the stock charger
Then I got a 2.1a charger and that fixed the problem.
My battery never got to 5v
4156mv = 4.1v
And it charges at 1500ma
If it were off then it will be 2000ma
remove the battery and put it back, it may help and also charge while it's turned off
USBhost said:
.... 41560mv = 4.1v
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You sure about that??
spark001uk said:
You sure about that??
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No lol the 0 should not be there
USBhost said:
No lol the 0 should not be there
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Ah OK, thought so! Also when you say your battery never got to 5V, did you mean across the battery itself? If so 4.1V sounds almost fully charged to me. It's a 3.7V li-po so 4.2V across it would be the absolute max.
Also I have this handy little gizmo, tells me precisely how much current I'm pulling on a USB line, and also the voltage.
i was used to try for hours to get my phone back to life after it shut down due to poor battery level, but now while it was fine the battery heated a lot and the phone powered off and after one day of tries i have still not succeeded to get it back on. when I plug it to the charger the device powers on and after some time it shows only the big red battery gauge, 1%. then sometimes it reaches 2% and after some time the part of the phone above the battery gets much hotter, though not as hot as the battery did earlier, and the gauge falls to 1%. I tried to keep it plugged for one or two hours and it shows only 1%. Actually it seems that the phone is configured to power on automatically as soon as it is plugged to an external power source. Li-ion batteries normally need to be recharged at very low rate when they're at very low level, though this is a dangerous case, so if the phone keeps powering on, the charging current might not be enough to over-compensate the drain.
I'm asking here because i'm wondering whether rooting the phone has anything to do in it, and if there's a special combo that could disable the phone from keeping powering it on every time it is connected to an external power source. I'm currently searching a way to get the battery recharged with an external charger.
heavytull said:
i was used to try for hours to get my phone back to life after it shut down due to poor battery level, but now while it was fine the battery heated a lot and the phone powered off and after one day of tries i have still not succeeded to get it back on. when I plug it to the charger the device powers on and after some time it shows only the big red battery gauge, 1%. then sometimes it reaches 2% and after some time the part of the phone above the battery gets much hotter, though not as hot as the battery did earlier, and the gauge falls to 1%. I tried to keep it plugged for one or two hours and it shows only 1%. Actually it seems that the phone is configured to power on automatically as soon as it is plugged to an external power source. Li-ion batteries normally need to be recharged at very low rate when they're at very low level, though this is a dangerous case, so if the phone keeps powering on, the charging current might not be enough to over-compensate the drain.
I'm asking here because i'm wondering whether rooting the phone has anything to do in it, and if there's a special combo that could disable the phone from keeping powering it on every time it is connected to an external power source. I'm currently searching a way to get the battery recharged with an external charger.
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The battery is shot, get a replacement
Sent from my LG-H910 using XDA Labs
cnjax said:
The battery is shot, get a replacement
Sent from my LG-H910 using XDA Labs
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are you sure?