Database Users

shut down voltage in rafpigna kernel

Hi Guys!
Sorry for posting this here, but with less than 10 posts i'm not allowed to post in development threads.
i'm using rafdroid 3.1 and really love it, it's a great build!
but my battery lasts only for about ~12-18 hours on normal usage. This is really a problem for me, it should last at least 24h, better 30h in normal usage. cause when i have to use it more, i need to go to ~12h without any problems...
i noticed that the shut down voltage in the used kernel is @ 3.6V, could somebody confirm this?
A li-ion battery can be discharged to 3.0V (maybe lower) without any problems. I'm into r/c planes so i have a lot to do with batteries and i know this is true, also look here: http://en.wikipedia.org/wiki/Cutoff_voltage#Premature_voltage_cut-off
So is it possible that i set the shut down voltage for myself to 3,2V or 3,0V?
Maybe this would bring the extra hours i'm searching for...
switching to a none sense build isn't a solution for me, i love sense and use it a lot (the dialer is really near to the best thing i can imagine, i also love friendstream and the weather widget with the fullscreen animation...)
We are dischargin with a maximum of 0,2C (~240mA) so when you look at this chart at the red line:
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we are nearly wasting the half battery time when shutting off @3.6V. with a shutoff @[email protected],2C i think we would have a 1/4 more use time. with a shutoff @[email protected] in standby mode (4mA) the battery would maybe stand 2 times longer?
but in fact of the fast downgoing voltage i would prefer to go to 3,2V to be on the safe side...
sorry for my bloody english, i hope everyone can follow me

I think this is a very interesting question. I have calibrated my battery but it seems like my ROM/kernel (imilka Vision Sense 4.1) is thinking that 3.6 V is the same as empty and shuts down. It initiates the shutdown procedure at that level approximately. After that it can be restarted some times before the battery is completely empty.
What I am looking for is a solution to change the shutdown voltage to 3.2 V instead of 3.6. It would be a good addition to the battery life.
If there´s some kind of configuration file that can be changed it would be good to have it done.
It seems like calibration doesn´t solve this configuration problem. It still shuts down at too high level.
I hope this thread can provide a solution.

That's really interesting. But I think it is a protection feature for the battery itself. So I don't know what might happen if you go down to 3.2V.
I'm not sure but this might be a driver or even something deeper in our phone that causes the shutdown so early. So I guess it's not very smart to touch this piece of the system and I don't know if it is possible anyway. But please, someone who knows better should let me know

As far as i know, the hardware cut off in the batterie is around 2.6v, so there would be no caution to the batterie itself. I also read that the software shutdown is in the kernel.
So the question is, if there is a posability to change the voltage myself or if this have to do a kernel chef?
The danger to destroy the batterie with this experiment would be very smal, and if, an original htc batt cost @ amazon ~20€...

Actually I think if you look at the post about Battery stats bin file, there is talk about the actual cut off without harm to the battery, and I think I remmeber seeing that 2.6 is the cutoff, is there a way to see what WinMo cuts off at? this way we are sure of the same cutoff, cause I agree the battery doesnt last nealy as long as winmo and that would be a good reason why.

It would be great if some of the devs could also say something to this thread

hopefully the devs notice this thread.
honestly this is the best (better most exciting) idea i have heard since magdlr came out did you allready ask in the irc?
#htc-linux, #htc-linux-chat on freenode

sorry, I'm not usin irc, maybe someone else could do this

I like this idea too especially since most batts have some juice left till 3.2 Volts and all the extra bits of minutes we can squeeze out of it is nice.
BUT, I wonder if this is not being done on purpose. Who says our beloved phone works under a certain Voltage treshold?
I have no schematic so I can't check on what Voltage the components and probably the Voltage regulator work.

There´s a sign that we should be able to get some more juice from the battery. When the device switches itself off there´s sometimes power left to do atleast 2-3 reboots almost until full boot (with other it switches off first when the home screen is supposed to be shown).
That is an indication that there should be some more power left in the battery which means the shutdown can be delayed somewhat in theory. When the battery is really depleted the HD2 switch itself off after one second of showing the bootscreen. But before it can almost complete 2-3 reboots.
In Windows Mobile it´s a little bit different - it can do one reboot before calibration but with Android it´s able to do more reboots before depletion. I would guess that 3.3 V would be a proper shutdown value when those reboots is considered. Unfortunately I don´t know how the voltage when it has been emptied down to "immediate shutdown" because it indicates 3.6 V after the first successful boot with charger connected.

My phone is dying at 30%... Started to happening when I changed the ROM. I managed to drain the battery to 7% with 3.4 V... At this point I can't keep de phone on to drain the rest. Tried all "calibration" methods.. not working

[Q] Newly rooted NC having battery issues...

Got a NC for xmas and rooted it and installed cm7.1 and everything seems to be working well except the battery. I went under battery use and i see that Display is eating about 60% of my battery! I turned brightness down to 25%-ish and i have also turned off everything i am not using but the problem still persists. I have seen people saying i need to do some kind of battery calibration but i do not know how to do this. If someone can help me get this issue resolved it would be greatly appreciated.

Unfortunately, you can only do so much about screen battery consumption. Turn brightness down as far as is comfortable, but personally, I don't want to give up the vibrant display. I find 25% is usually adequate indoors. With my screen ON, it consumes roughly 10% per hour of use, which equates to 8-10 hours of use -- not bad. With the screen OFF, it sips less than 1% per hour, and often less than that over a few hours.
Keep in mind, you WANT screen battery consumption to be the largest value. That means it's nice and idle when you're not using it. If something else is using a significant amount of battery, that may be something you can do something about.
As to calibration, I do find that Android battery gauges often are incorrect until you let the battery completely discharge from a full charge once. Then it's calibrated correctly. Of course, that's not recommended for battery health, so don't do it compulsively. I had a device that showed 1% battery remaining for 3 hours while I played MP3 audio.

I wish i was getting 10% an hour, im getting roughly 20% I now have another issue that i did not have this morning, i can not connect to my computer via USB. Is there a setting i might have turned off in my fit to increase battery life?

@Lsjreadingpa Renaming /system/app/phone.apk to phone.bak is a commonly undertaken act that can significantly lower battery usage. Also, you can turn off Account Sync when not using it actively, as it increases battery drain when you are not actively using the NC.
As far as the USB is concerned, make sure you have USB debugging checked in the settings menu.

disynthetic said:
@Lsjreadingpa Renaming /system/app/phone.apk to phone.bak is a commonly undertaken act that can significantly lower battery usage. Also, you can turn off Account Sync when not using it actively, as it increases battery drain when you are not actively using the NC.
As far as the USB is concerned, make sure you have USB debugging checked in the settings menu.
Click to expand...
Click to collapse
How do i rename it? Also a bit of an update, i have turned off syncing as well as alot of the other options and i am losing 5%/20min

Last night I cleared cache and battery stats and let the battery die and then charged it to full this morning. Like I said above I turned off syncing and gps as well as removing beautiful Widgets. I just don't know what else to do. I'm attatching two screenshots showing my battery use in the last hour.
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You can use Spare Parts to check what's consuming battery if your DOMAIN supports it.

Anyone able to help?

Are you concerned about battery consumption while you're using it? If so, then your brightness and the applications you're running are going to determine your battery life.
If it's battery consumption while idle (screen off) that you're concerned about, then do you have any widgets that do network access? I found that my battery life dramatically improved when I was no longer using the Twitter widget.
In Spare Parts you can go to Battery History, then check 'Partial Wake Usage'... this can help you figure out if there's an application that's preventing the device from going to sleep.

I would recommend trying a newer nightly or the Mirage/Kang build found in the Android Dev sub-forum here. I forget when they were added, but there were a few big improvements to CM7 a while ago to help with battery life.

Battery consumption while using it is kinda of scary because it drops like a brick. While sleeping, which i don't think it was doing, seemed to get better after i removed beautiful widgets. How different is the Kang build?

The Kang build has an updated kernel and other updates since the last CM7 nightly. It's supposed to fix an SOD issue. I've been running it for a while and am very happy with the battery life.
Like others have said, battery life while using it would most likely be helped by adjusting the display brightness, kernel settings and/or stopping "rogue" apps. You can see the kernel settings by going into the Settings Menu, then Cyanogenmod Settings then Performance. I use the InteractiveX governor (I believe "Performance" is the one that keeps the CPU ramped up constantly) with the highest overclock.

[Test] Battery Draining

Ok, I've been thinking about this for a while now so I'm going to make a test to decide if I really need a battery saver. I'm making this test for myself purely but I thought someone might wanted to see the results as well so here we go.
The gear:
Samsung Galaxy S2, non-rooted
2000 mah Samsung battery
The competitors
Phone on its own
JuiceDefender Ultimate
GreenPower Free
The settings
Prefer Wifi over data
Connect every 30 min to sync
No night settings (to be fair against the others)
Screen brightness: Auto
I know the battery savers are made to save battery when not using your phone so the screen will be locked the phone only used for a small amount of time between chargings.
The phone is unplugged at 100% and I will continue down to 30% before charging again. I will only be testing each one once, as of now at least.
We'll see how it goes over the next days so feel free to ask questions and such.

Many people I know with an S2 use battery saving apps but i really see no point in them, when we used to compare our stock phones running the same stock ROM there was minimal battery difference. Haptic feedback will be off or on? That makes a big difference.
You should put in a custom ROM to see how much better it is compared to stock.
i look forward to seeing the results of this test though

If I got it correctly haptic feedback is phone vibration on touch, right? That's off at least, never liked it. I'd like to put a custom ROM but I don't want to root the phone, yet.. Maybe in a few months or a year...
I will be updating this as we go along. At the moment we are at 96% with 3 hours of sleep time and only a few minutes of screen time.

Ermm, can I ask does task killer drain your battery? Sorry if I ask the wrong question.

darkmage17 said:
Ermm, can I ask does task killer drain your battery? Sorry if I ask the wrong question.
Click to expand...
Click to collapse
task killer will drain battery if the programs you closed restarts, use advance task killer and ignore those that do,you may need it for those apps that didnt close properly
im interested in your trial, juice defender service was failing to run on my s2, it ended up eating my battery restarting the service.
im looking to save power as i lose 15% over night with flight mode while i hear people lose 1,2%

Yes Android is a bit different than computer OS. To start an app drains more battery than just pushing the "back"-button and let it be in stand by so don't use task killers.
Yea I have had trouble some times with the battery saver draining quite a lot over the night but usually it has been because I had a mail as a widget with push-notification so the battery saver wouldn't disable internet but almost push all my other accounts as well. That was my solution at least. We'll see how this goes.
4h in 93% battery
15 min scrren time

A little update. You see where we are.
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And does anyone know what can have caused this? This is a picture from a few days ago. It has happened maybe 10 times over the last 2 months. Simply the phone gets hot and the only way to unlock the screen is to remove the battery, refit it and then start it. And then it shows this massive drain.

Okay we got 1 day 13 hours down to 30% with 30 min of screen time. Next up is the Juice Defender Ultimate with night settings off.

An update for you all. As you can see JuiceDefender has already passed the "vanilla" time.

I had an odd problem. Sometime during night, the battery suddelny decided to drain at much faster rate and it took it only 6 hours or so to drain from 75% to 15%. I checked with BetterBatteryStats but there seems to be no app that has kept it awake. Anyway, I can't continue with this test spimply because I don't have time for reruns.
What I can say in previous experience:
Vanilla
Great that as soon as a message comes in you get notified immediately.
Unfortunately that's because wifi or data is kept on all the time, draining battery.
JuiceDefender
Usually gives my phone 3-4 days of battery.
It does take some time (up to 15 sec or so) when you unlock the screen to connect and that can be annoying if you are in a hurry.
When I have night settings on to set phone in no vibration, no sound but also have different night setting time for weekends the phone vibrates once at midnight between weekdays and what JuiceDefender recognizes as weekend.
Sometimes it doesn't feel like the apps are updating even though settings are set to allow "dumb apps" to update as well as plenty of time to do so.
GreenPower
I have only had time to use it for a few days and it is only the free version. I will probably buy the premium soon.
It has a better UI than JuiceDefender though not so many settings. I'm not really sure if I need those other settings.
Best thing, it connects instantly to data when I unlock the phone so I can get on to the web or viber or such to see messages directly.
If anyone wants to continue this thread you may do so but I won't make more test as for the moment. Bottom line is that the data turning off when phone's locked really do help with battery life.

Nexus 4 sudden battery drops, sim pin requests

Hello all!
So I've owned the N4 since May 2013, it worked great, but right now some severe issues popped up. These issues include:
1) Sudden battery drops for no reason at all. The battery stats look horrible and nothing is draining the phone. See for yourself - added screenshot in the bottom of the post.
The battery drops often lead to a weird flat charge level. For instance, the battery immediately dropped for 20-30% (let's say, leading to a 50% charge), but that that 50% charge can remain for quite a while. Once it was like that even on 1%. Restarting the phone sometimes may bring the battery % up, but still the draining is unbelievable.
2) When the battery is below ~15% all hell breaks loose. I'm loosing the cell signal, sim pin requests pop. Basically, it's either charge the phone at this point or the phone will die in a couple of minutes. If you're using the phone with such low charge, the (what i assume) radio module restart will kill it soon.
Phone never been repaired, the screen is original. Also, the proximity sensor died (i guess) and I've had to flash xposed and install the "turn off prox sensor" module.
What I've already done:
1) Format cache
2) Factory reset
3) Clean flash stock ROM
4) Clean flash other ROMs (currently on Android M Chroma)
5) Flash older stock radio modules (thought it may prevent radio restarts)
6) Limiting my radio to only WCDMA mode (3G or nothing, instead of 2G/3G mode)
7) Replaced the battery few days ago (didn't help at all)
One more thing: my wife has the exact same phone, bought approx. same time ago. Bought from totally different places (one from Poland, second from Italy). Her phone has very similar symptoms, although, not to that extent. It means that her phone battery is also suddenly dropping and sometimes sim pin requests appear, but it's less frequent and not so bad as with my phone.
If you have any ideas how to pinpoint what's wrong or maybe even a solution - that'd be great. Thanks in a advance.
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Probably time for a new battery as the phone has been used for almost 3 years.

It's a number seven in "what I've done" list it was my last resort to change the battery and that didn't help at all (immediately saw the same symptoms). That's why I'm clueless and wondering if the phone is basically dying...
Thanks for the reply though.

Are you sure the replacement battery is good?

audit13 said:
Are you sure the replacement battery is good?
Click to expand...
Click to collapse
Yeah, it's new and bought from the reliable store.

Try the new battery in your wife's phone?

That would require buying one more battery, because the original is so strongly glued to the case, that I will destroy it in the process of taking out (like I did with my own). So not really the best option to continue buying new batteries for allegedly fried phone

I understand. Maybe you need to apply more heat to loosen the adhesive?

Any Luck ?
ravenua said:
Hello all!
So I've owned the N4 since May 2013, it worked great, but right now some severe issues popped up. These issues include:
1) Sudden battery drops for no reason at all. The battery stats look horrible and nothing is draining the phone. See for yourself - added screenshot in the bottom of the post.
The battery drops often lead to a weird flat charge level. For instance, the battery immediately dropped for 20-30% (let's say, leading to a 50% charge), but that that 50% charge can remain for quite a while. Once it was like that even on 1%. Restarting the phone sometimes may bring the battery % up, but still the draining is unbelievable.
2) When the battery is below ~15% all hell breaks loose. I'm loosing the cell signal, sim pin requests pop. Basically, it's either charge the phone at this point or the phone will die in a couple of minutes. If you're using the phone with such low charge, the (what i assume) radio module restart will kill it soon.
Phone never been repaired, the screen is original. Also, the proximity sensor died (i guess) and I've had to flash xposed and install the "turn off prox sensor" module.
What I've already done:
1) Format cache
2) Factory reset
3) Clean flash stock ROM
4) Clean flash other ROMs (currently on Android M Chroma)
5) Flash older stock radio modules (thought it may prevent radio restarts)
6) Limiting my radio to only WCDMA mode (3G or nothing, instead of 2G/3G mode)
7) Replaced the battery few days ago (didn't help at all)
One more thing: my wife has the exact same phone, bought approx. same time ago. Bought from totally different places (one from Poland, second from Italy). Her phone has very similar symptoms, although, not to that extent. It means that her phone battery is also suddenly dropping and sometimes sim pin requests appear, but it's less frequent and not so bad as with my phone.
If you have any ideas how to pinpoint what's wrong or maybe even a solution - that'd be great. Thanks in a advance.
Click to expand...
Click to collapse
I am facing a similar issue, did you find any solution ?

Unfortunately not.
Battery replacement did not help. Also tried replacing charger port controller on the motherboard, but that did nothing as well.
Ended up buying new phone and selling this one for dirt cheap amount of money.

The same started happening to me a couple weeks ago.
I think it's time to change to nexus 5 (or similar)

Same is happening to me, the cheapest solution is to use a power bank as I'm not ready to leave my Nexus 4.

s7 battery problem

I just got my s7 and use for a week. But the battery of my s7 drain very fast. And I can't use other charger to charge except for the original charger. Anyone has the same problem? Is my battery faulty or is there any fix for tat?

I thought the Elephone s7 didn't come out yet, how did you get it?

Preorder
krouri said:
I thought the Elephone s7 didn't come out yet, how did you get it?
Click to expand...
Click to collapse
Bought mine preorder 3.Nov
This is my fifth day with my S7 runs like a charm except some problems regarding incoming call
postimg.org/image/5lnkamd4x/

When you say drain fast, what do you mean? What screen time are you getting? What's the issue with incoming calls?

dave8840 said:
I just got my s7 and use for a week. But the battery of my s7 drain very fast. And I can't use other charger to charge except for the original charger. Anyone has the same problem? Is my battery faulty or is there any fix for tat?
Click to expand...
Click to collapse
I have the S7, 64GB and I also feel the battery drains quite fast. Around 3 Hours screen on time.
Currently trying with disabling the 2nd SIM & also turned the performance setting to low power and but has not made much difference yet.
Also I suspect the "Clear background App" setting/system app is unnecessarily killing apps in the background and causing even more app-restarts. Any way to turn this app off and instead use Greenify ?

dave8840 said:
I just got my s7 and use for a week. But the battery of my s7 drain very fast. And I can't use other charger to charge except for the original charger. Anyone has the same problem? Is my battery faulty or is there any fix for tat?
Click to expand...
Click to collapse
I use my s7 five days and it was fine, tonight phablet did not respond to pressing the power button, left display off, I pressed multifunction button to wake up the device, but nothing happened. I attached charger but after an hour of charging phone is always off. I took away the SIM card and SD memory card and charging unit remained, and after another half-hour phone is always turned off and does not start anymore.
for five hours phone is dead but feels heat in the area of ​​the rear camera ... I think the problem started from the battery, because the same area was heated slightly during charging.

I have got the same problem, the battery is running down too fast. I only have used since last 3 days and I have to charge the battery twice every day. Any solution?

Hi,
No troubles here, battery is fine on my 3G/16G.
Do you have the problem when the phone is as new and wiped out clean from the recovery ?
Can you try this withouth installing anything ?
Best regards

For me, at the end of the day, about 40% of battery left.
I turn the battery pref into low performance, and no problem for my use

I am a light user and I get only 8 to 10 hours with the S7.
I recharged from 12% to 44% in less than 20 minutes,but it seems to empty just as fast.
I have heard that you should let it run down,till it shuts down and then recharge it and that helps the battery life

i have exactly the same problem .. no answer from elephone

vleskos said:
i have exactly the same problem .. no answer from elephone
Click to expand...
Click to collapse
I had same problem with S7 Mini, turned out it was 'Play Services'
Check this link for details. https://forum.xda-developers.com/elephone-s7/help/elephone-s7-mini-terrible-battery-drain-t3560035

Try this.. Go to settings, clear background application,, check all the apps as whitelist. It turns out the phone usually clear background applications, its logic to save battery is by shutting off every app which is running in background, but by doing this, the processor will work harder to bring up every apps back to work which means more energy more energy consumptions.
And turn of your finger print scanner. I did these and got my discharge rate 1%/h in standby.

Cyput said:
Try this.. Go to settings, clear background application,, check all the apps as whitelist. It turns out the phone usually clear background applications, its logic to save battery is by shutting off every app which is running in background, but by doing this, the processor will work harder to bring up every apps back to work which means more energy more energy consumptions.
And turn of your finger print scanner. I did these and got my discharge rate 1%/h in standby.
Click to expand...
Click to collapse
Thanks, testing.
What about the Intelligent battery saving" toggle under battery settings.
I've left it on for now

I switch it on.
Yesterday i got 1 day and 10 hours battery with 3 hours screen on time, it was 17% just before i recharge it. Low power mode

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i did the suggestions but i also found my main culprit was risilo Sync the new name for btsync over night with no WiFi it used 21% battery. Turned off the wake check in settings and added it to greenify.