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It is still early days, but I thought I'd share this with all Android users on the HD2.
Like almost all members here, I flashed my HD2 to Android, now using a ROM on the SD, which takes up more battery power. Like almost all users, I too got battery draining issues. So I bought an original HTC 2300mAH battery, and.... no difference!
After installing a simple app called Battery Monitor (NOT Battery Monitor Widget), and changing the battery reading to volts within the app, I continued using the phone. The app showed, at the time of installing, 85% and the standard icon showed 43%. I disabled power saver and continued using the phone ignoring all battery warnings. The battery monitor showed 65%, when the standard icon showed 3% late in the night. I kept the phone on all night with syncing on, expecting the phone to switch off, but, in the morning, the standard icon showed 2% and Battery monitor, 58%.
My point being, the standard battery software clearly didn't read the extended battery's charge/discharge levels and probably needs to be recalibrated. Also, could it be that the standard batteries too are not being read correctly? I mean, we all may be thinking that the HD2 is a power hogger, which may not be the case.
I will be trying this experiment on the standard battery as well, and let all know on this.
jiggyk
Hit "Thanks" if you found the post useful.
do the battery calibration. completely charge and keep phone charging, open termimal emulator and type:
$su rm /data/system/batterystats.bin
reboot phone, after completly reboots remove the batterystats.bin again and then unplug phone and allow to die out. recharge and it should start reading correctly... 100% is aprox 4.2+, use battery indicator to read battery levels and info.
Sent from my DROIDX using the XDA mobile application powered by Tapatalk
jiggyk said:
It is still early days, but I thought I'd share this with all Android users on the HD2.
Like almost all members here, I flashed my HD2 to Android, now using a ROM on the SD, which takes up more battery power. Like almost all users, I too got battery draining issues. So I bought an original HTC 2300mAH battery, and.... no difference!
After installing a simple app called Battery Monitor (NOT Battery Monitor Widget), and changing the battery reading to volts within the app, I continued using the phone. The app showed, at the time of installing, 85% and the standard icon showed 43%. I disabled power saver and continued using the phone ignoring all battery warnings. The battery monitor showed 65%, when the standard icon showed 3% late in the night. I kept the phone on all night with syncing on, expecting the phone to switch off, but, in the morning, the standard icon showed 2% and Battery monitor, 58%.
My point being, the standard battery software clearly didn't read the extended battery's charge/discharge levels and probably needs to be recalibrated. Also, could it be that the standard batteries too are not being read correctly? I mean, we all may be thinking that the HD2 is a power hogger, which may not be the case.
I will be trying this experiment on the standard battery as well, and let all know on this.
jiggyk
Hit "Thanks" if you found the post useful.
Click to expand...
Click to collapse
Hey!
You do realize, that the difference between the android system battery level and the battery level provided by the app "battery monitor" is due to different minimum voltage levels?
The minimum voltage level where the system would shut down is around 3.600 mV.
The minimum voltage level of "battery monitor" on the other hand is 3.200 mV by presettings. (actually you can set the minimum voltage manually)
As a result, "battery monitor" lets you discharge the battery more which results in a longer time you can keep the device running.
I would be careful though, cause undercharging is very bad vor lithium batteries, meaning a decrease of the battery lifetime.
Take care,
Ric
akaruna said:
do the battery calibration. completely charge and keep phone charging, open termimal emulator and type:
$su rm /data/system/batterystats.bin
reboot phone, after completly reboots remove the batterystats.bin again and then unplug phone and allow to die out. recharge and it should start reading correctly... 100% is aprox 4.2+, use battery indicator to read battery levels and info.
Sent from my DROIDX using the XDA mobile application powered by Tapatalk
Click to expand...
Click to collapse
This command, it removes batterystats.bin, doesn't it?
ricola7 said:
Hey!
You do realize, that the difference between the android system battery level and the battery level provided by the app "battery monitor" is due to different minimum voltage levels?
The minimum voltage level where the system would shut down is around 3.600 mV.
The minimum voltage level of "battery monitor" on the other hand is 3.200 mV by presettings. (actually you can set the minimum voltage manually)
As a result, "battery monitor" lets you discharge the battery more which results in a longer time you can keep the device running.
I would be careful though, cause undercharging is very bad vor lithium batteries, meaning a decrease of the battery lifetime.
Take care,
Ric
Click to expand...
Click to collapse
Hi!
At the time I wrote this, it was discharging and I was keeping an eye on the voltage. You're right, it completely discharged at around 3.66, and I set that as the minimum voltage.
Regards,
jiggyk
you should install a kernel support extanded batteries
Sent from my HTC HD2 using XDA Premium App
securecrt said:
you should install a kernel support extanded batteries
Sent from my HTC HD2 using XDA Premium App
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Click to collapse
Thanks. I re-flashed with a ROM with a kernel for extended batteries. Now it shows the charge/discharge very accurately.
I checked my battery monitor widget today am noticed something very strange. It showed me 40% charged when I was sure it was only 35% charged before I went bed! WTF did it charge itself? As you can see from the screenshots the phone was not on charge and was awake for most of the night which has never happened before. I have not installed any new apps in the last few days I have never seen this before on any of my android phones over the years. After 1 month of using the note this is the first glitch i've noticed (if it is a glitch). I am on stock LA4.
Anyone have any ideas as to why this happened?
I'm not complaining ( wish it happened every night!) just curious.
I have noticed the same strange thing with ICS.
did you try pinching your arm?
/Jeriz
It is probably/maybe your battery stats that was not exactly "right" and might "recalibrate" your battery stats to the true value.
The simplest answer is always the true one: It is having trouble reading your battery right. Happens with mine too sometimes.
LOL I had the same thing happened to me.
First day with my note. And so far I am loving it.(despite colour rendering issues , and a very lagging stock keyboard)
Sent from my GT-N7000 using xda premium
Maybe the phones are evolving and learning to use the sensor on the Front to charge itself lol
Sent from my Galaxy Note
This has happened to me several times already since the Galaxy S days.. sometimes after a reboot the battery looses 50% and slowly charges back up its quite funny and strange, never happened to my note though.
What do you think happens if some of the services is not needed anymore and stopes relaying,the battery % estimation will go up.
georgios73 said:
I checked my battery monitor widget today am noticed something very strange. It showed me 40% charged when I was sure it was only 35% charged before I went bed! WTF did it charge itself? As you can see from the screenshots the phone was not on charge and was awake for most of the night which has never happened before. I have not installed any new apps in the last few days I have never seen this before on any of my android phones over the years. After 1 month of using the note this is the first glitch i've noticed (if it is a glitch). I am on stock LA4.
Anyone have any ideas as to why this happened?
I'm not complaining ( wish it happened every night!) just curious.
Click to expand...
Click to collapse
Mine charged itself too.
Went from 30% to 50% when I was out.
I thought it has some solar panel hidden beneath.
hagba said:
What do you think happens if some of the services is not needed anymore and stopes relaying,the battery % estimation will go up.
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Click to collapse
Wtf are you talking about? That's not any kind of estimate of lifetime, that's a report on amount of energy left. And in this case, specifically, a bug in it's reading.
Livewings said:
Mine charged itself too.
Went from 30% to 50% when I was out.
I thought it has some solar panel hidden beneath.
Click to expand...
Click to collapse
That one a good idea. Smartphone company should consider to put it in every phone in future..lol
Sent from my GT-N7000 using XDA App
When I saw this thread, I immediately opened my battery stats only to see this:
lulz
Viamonte said:
Wtf are you talking about? That's not any kind of estimate of lifetime, that's a report on amount of energy left. And in this case, specifically, a bug in it's reading.
Click to expand...
Click to collapse
You need to review your facts make a bit more research, the report is based on the fact that how many apps and services are you using,say if the wifi is on, it will show you certain %, however if you turn it off will report you that it has increased, depending on the running apps and services how much battery is left, my laptop does it all the time,unless you are living in pre Smart Battery Meter era.
I have to agree that if the % relies on the voltage (as I am sure it must do to some extent, but I am only guessing), stopping heavy services will allow the voltage to increase and the app may see that as a gain.
Alternatively we have discovered Samsung's secret OTA charging method! This explains why some phones have terrible battery life, they are being sucked dry by nearby 'Vampire Notes'!
Now, if we could just work out how we could charge all Notes by sucking iPhones dry ....
turshija said:
When I saw this thread, I immediately opened my battery stats only to see this:
lulz
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Click to collapse
Mega wtf. :O
Sent from my GT-N7000 using xda premium
Battery is trolling
The Galaxy Note battery is a three terminals battery. So I think that the % state of charge of this battery is directly calculated from its output voltage.
The voltage decrease as the charge decrease, so it is possible to evaluate the residual charge in the battery.This is not a very precise method but it is quite simple to implement.
After a high current drain there is what is called a ''voltage recovery'', the battery voltage increase slowly a little bit as the current is stopped. So you may think that the battery get back energy, but unfortunately it is only an artifact.
Yesterday I showed you all how my battery indicated that it had charged itself.
So guess what folks today when I checked the complete opposite happened!!
Again as you can see it went from 48% just before I went to sleep only to wake up to a dead phone (switched off). Upon rebooting it showed only 9% !!
Now I can cope with it going up but going down is not good.
Hope its not a hardware problem and just a faulty battery.
lets see what happens tomorrow maybe it will explode!
I'm an EE (election engineering) student. Michel_7 is right. Lithium ion batteries experience a voltage sag during high current draws. Afterwards there is some rebound, both as the battery cools if over temp, and with a period of lower activity. This is in part due to the fact that batteries have internal resistance, and as they supply power, they also dissipate some internally. This is of squared proportion to the current drawn. IE current^2 * resistance. Battery resistance constant, so the more power the phone uses, the more the battery does. This is what heats up the battery.
Sent from my GT-N7000 using xda premium
My battery was at 9%. I plugged it in, rebooted to recovery and it read 70%. I thought it was just a misread but when I rebooted it was still at 70%. Has anyone seen this before?
I'm running HB 0927, fast charge is off.
sent from the depths of helly bean
Mine acts that way, but usually just the opposite. Then over time it slowly goes up.
yeah im having a similar problem my phone battery will be at 88% then it will me at 60 in under 20 minutes which is very unusual
blizzardproof said:
yeah im having a similar problem my phone battery will be at 88% then it will me at 60 in under 20 minutes which is very unusual
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Click to collapse
I've noticed that while in use the batt percent will drop a lot but then rise a few percent when you turn screen off.
sent from the depths of helly bean
Mine has done the opposite where it read 70 and dropped to 3% when I got into recovery. What's also odd about mine is that every time it says Charged, when I unplug it, it's never higher than 96%. But if I talk on the phone while it's plugged in, it will go as high as 99%.
That used to happen to me. I just plugged my phone in when it was dead, then I rebooted and I had 70%. Its actually very convenient. When I have to go somewhere, I just plug it in for a minute and my battery is all good to go.
Sent from my SAMSUNG-SGH-T989 using xda premium
Lol it doesn't work that way, the phone might not read the battery percentage correctly, doesn't mean it can fully charge the battery in a few minutes. After you flash a rom or factory reset, it might take a bit of using the phone to get a precise battery reading.
Although some rom have the feature to enable fast charge, but it only improve charging by a bit.
Also its okay to not charge lithium ion batteries to 100% all the time, its actually better for the life of the battery to only charge up to high 90s, some roms have the feature to limit the charging percentage.
It's because now-a-days people don't know too much about the incorrect battery stats and how to fix them.
I've had the same problems, but it's quite weird, it goes up sometimes and down most of the time.
Charge to 100% - or as high as your phone gets - then wipe battery stats. Reboot a few times and charge again to 100% and then do it again.
There's a much better method laying around here, but i'm just too lazy to search right now.
Mine,does that also. I pull the battery out and it recorrects it
Sent from my SGH-T959 using xda premium
Charging it solves the prob, but rebooting without just screws it up, especially when I had a camping retreat I couldnt call anyone causr of incorrect stats.
Sent from my SGH-T999 using xda app-developers app
This is curious. It's been this way for about a day or so. No actual battery life issues that I can tell. No heat or performance issues. Battery calibration?
T-mobile rooted and my only mod is AdAway.
Other than this issue, all is normal.
Thoughts?
Vexamus said:
This is curious. It's been this way for about a day or so. No actual battery life issues that I can tell. No heat or performance issues. Battery calibration?
T-mobile rooted and my only mod is AdAway.
Other than this issue, all is normal.
Thoughts?
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Click to collapse
Someone else reported something like this in another topic. I can't remember what type of V20 they had. My thought was that the battery was bad.
Sent from my LG-H910 using Tapatalk
spexwood said:
Someone else reported something like this in another topic. I can't remember what type of V20 they had. My thought was that the battery was bad.
Sent from my LG-H910 using Tapatalk
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I'm almost 100% certain that it's a calibration issue. 100% software. There were similar issues in a Samsung 6.0.1 ROM as well. Bad battery would be never reporting as "FULL" to the OS. Fortunately, even if it's a bad battery, thank jebus for replaceable battery!
One of the things I'm trying was to pull the battery, hold the power button down to discharge any capacitors in the charging or power circuits and then replaced the battery. Now it shows 89% and charging as well as "collecting battery info... please wait.". I'll let you know if it breaks 94%. I think the calibration was off after going a full day of constant usage but plugged in (drove 10 hours while using Waze).
Definitely a calibration issue. The above method had the predicted effect. Fully charged at 100% again. Spread the word. FYI, I held the power button for a good 30 seconds with no battery in the phone and obviously unplugged.
Peace!
Vexamus said:
I'm almost 100% certain that it's a calibration issue. 100% software. There were similar issues in a Samsung 6.0.1 ROM as well. Bad battery would be never reporting as "FULL" to the OS. Fortunately, even if it's a bad battery, thank jebus for replaceable battery!
One of the things I'm trying was to pull the battery, hold the power button down to discharge any capacitors in the charging or power circuits and then replaced the battery. Now it shows 89% and charging as well as "collecting battery info... please wait.". I'll let you know if it breaks 94%. I think the calibration was off after going a full day of constant usage but plugged in (drove 10 hours while using Waze).
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Click to collapse
Well, you see, at first I thought it was a bad battery, but last night, my battery began acting funny. It was at something like 40% and then I did 1 reboot and then battery was at 25%. Then I had to reboot again, and battery was suddenly at 18% and stayed that way for a long time. I decided to try the calibration thing and it may have solved some of my battery issues (I did a few other things too, so not sure exactly what helped). I was always told that battery calibration was no longer necessary. Something about the way that Android reads the voltage of the phone rather than the capacity now... Or something... I forget the technical mumbo jumbo. Anyways, that's one reason I always had been telling people that calibration is just a placebo and that their battery may just be bad. Now I'm not too sure what to think!
Sent from my LG-H910 using Tapatalk
So, I'm having a weird issue where my battery will lose 3-4% within a few minutes of unplugging from the charger after it's full. It will also stay at the same percentage for a long time, for example yesterday it was on 18% for nearly an hour. Pretty much what I'm saying is the battery life isn't bad at all but the percentage is way off. Is there any way to fix that or is it just that the battery may need replaced?
The battery needs calibration...that's all....use an app and follow instructions.....or just full charge then just drain the battery completely until the phone refuses to power on.....and then charge to 100% in power off mode....you will be good to go then
Justo use your phone normally
No need to calibrate nothing or do nothing it's a myth
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fburgos said:
Justo use your phone normally
No need to calibrate nothing or do nothing it's a myth
Sent from my ONE A2005 using Tapatalk
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Calibration is not a myth....calibration doesn't magically increase battery life....screen on time(SOT) Isn't affected by calibration........it just ensures that the battery percentage shown is equal to % charge left in battery......its just to know how much battery juice you are actually left with.
Battery percentage can't be calibrated, battery stats file is wiped on 100% charge, unless the file is somehow corrupted or read only or some crazy stuff wipe it might fix issues.
% depends on voltage, calculated drain and stuff
A bad battery can cause those drops when the phone reads the actual voltage left
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