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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...
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?
Click to expand...
Click to collapse
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?
Click to expand...
Click to collapse
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!
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.
Hello! i have problem with my streak 5, few days ago battery drained out and phone shut down.
i connected ti a charger but nothing happen, no reaction on phone so i left it on charge all night.
Still no response, no picture on the screen, no backlight, no LED, completely dead.
I can get reaction only when i enter in fastboot mode (holding power+camera)
IN this mode touch screen not working, computer recognize device and i can do flash and i do it successfuly but i still cant turn on my phone.
What can be a problem, I tried everything with no luck, also i have not found anyone with same problem
I have 2.2 official, no root.
Try changing the battery. The one you have could be defective, or else there is an issue with the charging circuit.
I measured with instrument 3,67V, connected od 1 and 4. And few other combination i get from 3,30 to max 3,67V.
This seem to be ok, regardless of that you think might be the battery?
Never let the battery drain that much becase now the battery doens't have enough power to start the charging... you should charge the battery manual with some wires on (+) and (-) from a old phone charger be carefull with the voltage(V) and the ampers(A) not to brake the battery, 20 or 30 min should be enough, or you should buy one of this Universal charger. Then place the battery in the phone and it should work ok .
This morning I optimistically tried to turn on a phone and it was successful
battery Indicator showing 7% so i connected to charger, now is normaly charging, everything is working normally...
I do not understand, what could happen? i few times drained battery to 0% but still able to charge, maybe battery is problem, but again, turned on after 3 days
Don't worry the battery is ok the problem is not to empty it again to 0%, at 5% 7% close the phone if you don't have a charger to charge it. This method applies to every phone and battery. It's not a good thing to fully discharge.
Now is fully charged and power is 4,07V.
So obviously battery caused this problem.
I think, good info for all who suspect on battery, 4,07 V is power you need to have on fully charged battery.
With 3,6V you cant event turn on the phone.
Thank you for suggestions
when i charge it goes 90% in few seconds when i unplug the charger it goes to 5% in few sec then it shutdowns..
i tried to flash stock rom but no help..
what should i do..?
busted battery? how old is it?
Sent from my MB526 using xda premium
I had this. It was not the battery. I replaced it. Wiped battery stats. When you charge does it keep stopping charging?
Sent from BOX13.
howard bamber said:
I had this. It was not the battery. I replaced it. Wiped battery stats. When you charge does it keep stopping charging?
Sent from BOX13.
Click to expand...
Click to collapse
what do you mean?
when i plug the carger it goes 15% 30% 50% then 100% in few seconds...
when i unplug it shutdowns..
I have a similar problem
My battery was getting bad for a while, so I bought a new one off Amazon USA (I hope it's real). However since I put the new battery in my phone and switched to CyanMobile, my battery has been all over the place.
I can't get through a 9 hour work shift on 2G speeds (where I may glance at my phone 2 or 3 times). As well as the battery running down quickly, it'll jump from say 80% to 60% or 50% to 30%.
It does this both when charging and discharging. i.e. the phone just died. I plug it in to charge whilst switched off, and the screen immediately shows 20% charge. I turn it on whilst plugged in, and by the time it boots up it shows 60%!
I've tried deleting battery stats in recovery mode, and using a battery calibration app from the market...but nothing
What to do?