When my phone is doing nothing, sitting in my pocket, it'll drain a decent percentage. I was at work today, and from 11-2 it drained 25%, and I didn't use my phone AT all. I have good coverage in my area, and was at 0% time without a signal. I dont use app killers at all, I dont think I should baby my phone, it can handle it self.
I just find it to be really frustrating when my phone is draining battery when im not even using it. I cant trust it to hold a charge.
I checked the partial wake usage, and under "internet" theres about half a millimeter of blue, then Android System which has even less, about a hair's width of blue.
What can the phone possibly be doing?
To be honest I have the same issue and I would like to know how to properly address this without rooting, hacking or anything that involves voiding my warranty in any way.
-> thanks
There are two internal processes that can consume processing resources and suck the life out of batteries. These are common issues for many users. They are the "suspend" and "init" processes.
You can determine which might be causing you grief, if either, by installing Watchdog Lite from the Market. Configure its preferences to include, monitor, and display phone processes to be able to check on these possible runaway processes.
If it is the "init" process causing difficulty, you can eliminate it by enabling USB Debugging in Android Settings. Just having debugging enabled is enough to eliminate it.
If it is the "suspend" process causing difficulty, you will have to reboot the phone. But the problem will go away, at least for some time, until the phone enters a state that causes the problem to reoccur.
Hi android users,
I got a new micromax yureka and am having an issue of battery drainage from the very first day. I just installed few apps like whatsapp, facebook, mx player etc. Sometime later, I observed that my battery is discharging very soon. It seems like, can discharge from 100% to 0% in just 2-3 hours.
I checked the battery status and found that "Media Server" is listed on the top with 51%. For this, I did this:
Settings-> Apps ->All, select Media Storage & disable it. Clear data & reboot. Now enable it & reboot.
Referred from: http://forum.xda-developers.com/yureka/help/solve-battery-drain-issue-yu-yureka-t3015549
Now somewhat battery is discharging slowing but still results are not good. Also, mobile is charging very slowly. (Say <=20% in an hour). I googled other solutions for this problems, but none worked. Can anyone help me in this?
PS: My device is not rooted.
Yureka has released one update. Just checked if that resove this issue or not.
Also use auto brightness, this enhance battery life
You can also use Greenfy app to boost Yureka's battery life, but yureka should be rooted.
Try This Works !00%
Battery Full How to save battery life on your Android device: 20 Tips
Most smartphones have either a Lithium Ion battery or a Lithium Polymer battery. Both are Lithium Ion though, and as such, do not have a ''memory'' which means you don't have to fully charge or discharge them at the beginning, and partial charging is fine throughout their life. In fact, these types of batteries suffer from low voltage, so it's actually much better to charge them, even if only a little, whenever you have the chance rather than to fully charge and fully drain them.
1. Use a dark colored background
2. Make apps darker too
3. Get rid of auto-brightness
Don't use display auto-brightness. It may sound good, but auto-brightness is usually way brighter than you really need. It's much better to manually set a super low brightness level that is still comfortable, and then just bump it up when necessary. This is one of the main ways to improve your battery life as the screen is one of the biggest battery suckers.
4. Vibrate away!
Switch off vibrate. Unless you really need that added awareness, turn off vibration. It actually takes more power to vibrate your phone than it does to ring it. Turn off haptic feedback too. Sure it feels cool, but it doesn't really add anything to your experience, and it's another battery drainer.
5. Don't use a knockoff
Only use original batteries or respected third party manufacturer batteries. Saving a few bucks on a battery that might damage your beloved smartphone is a poor choice indeed, and may also deliver sub-standard battery performance.
6. Having a timeout is good
Set your display's screen timeout to as short a time as is practical for you. Just think, if your screen timeout is set to a minute, it'll use four times the amount of power to have it on, every time you switch your screen on, than if your timeout is set to 15 seconds. Studies report the average smartphone user turns their smartphone on 150 times a day, so anything you can do to limit that frequency (through self-control or other methods listed below) will help keep your battery running for longer.
7. Get your notifications to leave you alone at night
Set ''sleep times'' or ''blocking mode'' to switch off Wi-Fi and mobile data when you don't need them. If your phone is basically off limits at work, set your device to not ring, vibrate or connect to the internet while you're at work. Likewise, you can set your phone to airplane mode when you're asleep or use sleep or blocking modes to set up limits for what your phone does during certain times of the day, whether that's while you're asleep, at work or in a meeting. Get to know the specific settings your ROM offers. Not only will you have to fiddle with your phone less throughout the day (or night), but you'll be saving on battery life too.
8. Your phone doesn't have to be smart all the time
Turn off smart features like air gestures, smart scrolling and the like, Unless you really use these features every day, they're just using battery power for a feature you don't use.
9. Nor do you need to be connected 24/7
Turn off GPS, Bluetooth, NFC, Wi-Fi and mobile data whenever you don't need them. Turning off location data, or setting it to use Wi-Fi or 3G data rather than GPS works perfectly well. Only turn on Bluetooth and NFC as long as you need them, and there's no need to have both Wi-Fi and mobile data turned on at all times. If you use Wi-Fi a lot though, say at home and at work, then it makes sense to keep set your Wi-Fi to ''Always on during sleep'' as this uses less power than to have your Wi-Fi reconnecting every time you wake your phone.
10. Try out Dynamic Notifications
Use lock screen widgets or notifications if your ROM supports them, or install an app that does it for you like Dynamic Notifications. You'll be able to get basically all your content without having to unlock your phone fully and navigating around. You still need to light your screen up, but you'll have it on for much less time than normal. using a lock screen notification app with a black background can save your battery life significantly.
11. Don't get bogged down by widgets
Ditch widgets you don't really need, especially those that are connected to the internet like weather widgets.
12. Don't let your apps fall behind the times
Keep your apps updated. There's a reason developers constantly update apps, and many of these reasons are memory and battery optimizations. Keeping your apps updated also means you have the best optimizations available. Likewise, delete old apps you no longer use, as these may be running background processes that chew up RAM and battery life.
13. Use your battery saving mode, now!
If your phone has a battery or power saving mode or other battery management option, make use of it.
14. Explore the battery saving features on your phone
All ROMs, whether it's stock Android, OEM UI's like TouchWiz or custom ROMs like CyanogenMod, have various settings in the menu to help conserve or optimize battery consumption here and there. Find these various options for your device and ROM and make them work for you!
15. Choose when you sync your data
Turn off auto-syncing for Google accounts. If you don't need every single Google account updated every fifteen minutes, just go into your Settings and Google account and turn off auto-sync for those apps you don't need constantly updated.
16. Be the master of your app updates
Set apps to update only when you launch them. If you rarely (or very frequently) open an app, it might be better to only have it update when you do so, rather than updating automatically all the time via push notifications or sync intervals. If you only check email once a day, why not let the app update then only, and if you're on a widget or app every couple of hours anyway then why not have it update each time rather than every fifteen minutes when you're not even looking at it
17. Be app update savvy in the Google Play Store
Change your Google Play Store settings to manual update your apps. If you have the Play Store set to auto-update, you might have fifteen apps updating when you least expect it, destroying your battery life (and data plan) without you realizing it. If you use even half of these battery saving tips you'll see a marked improvement in your battery life.
18. Turn off Google hotwords
Stop your phone from always listening. Google's "Ok Google" voice searching is a fantastic and often very functional feature. The problem is that it can play havoc with your battery. Go into "Google settings" from your app drawer and tap the "voice" heading. On the next page, select '"Ok Google' detection". In this menu, the best option for battery life would be to untick all boxed, but if you are a fan of "Ok Google", tick only the "From Google Search app" box to ensure your device is only primed while in the Google app.
19. Get rid of animations
Disable animations. This process may differ slightly from device to device but the crux of it should remain the same. Go to your settings and to the "about phone" page. Tap on the "build number" around 7 times. You will be notified that you have become an "Android developer" (don't worry, enabling the Android developer options doesn't have any adverse affects, it just adds another option in your settings menu). Go back to your settings and tap on the newly inserted "developer options" menu at the bottom. On the next page, scroll down to where it says "window animation scale," "transition animation scale" and "animator duration scale", and switch all of these off. Your device's interface may no=longer look as pretty, but the battery life will be better.
20. Make your location services more battery-friendly too!
Turning off location services isn't just a fantastic way to save on your battery, it saves on your data plan too! Go into your settings and you will find "location" under the "personal" heading - tap on it. At the top of the next page it you will see "mode" in this menu you will be able to set the options for how your smartphone determines your location. Select "battery saving" on the following page.
#Courtesy to Android Pit.
prembaranwal said:
Hi android users,
I got a new micromax yureka and am having an issue of battery drainage from the very first day. I just installed few apps like whatsapp, facebook, mx player etc. Sometime later, I observed that my battery is discharging very soon. It seems like, can discharge from 100% to 0% in just 2-3 hours.
I checked the battery status and found that "Media Server" is listed on the top with 51%. For this, I did this:
Settings-> Apps ->All, select Media Storage & disable it. Clear data & reboot. Now enable it & reboot.
Referred from: http://forum.xda-developers.com/yureka/help/solve-battery-drain-issue-yu-yureka-t3015549
Now somewhat battery is discharging slowing but still results are not good. Also, mobile is charging very slowly. (Say <=20% in an hour). I googled other solutions for this problems, but none worked. Can anyone help me in this?
PS: My device is not rooted.[/QUOTEgallery is not detecting images in internal storage and memord card
Media server is consuming more than 50% battery so I disable the media storage from app and reboot it and enable it and again boot it but after that my gallery is not showing any of the images in memory card and internal storage ....please help me out
I also did a factory reset but it is not getting fixed
Click to expand...
Click to collapse
i have brought yu yureka and in that i have a problem like,while am speaking a call it automatically increases the brightness ,,,,can i get help to get iut from tis
amalmathewkutty said:
Battery Full How to save battery life on your Android device: 20 Tips
Most smartphones have either a Lithium Ion battery or a Lithium Polymer battery. Both are Lithium Ion though, and as such, do not have a ''memory'' which means you don't have to fully charge or discharge them at the beginning, and partial charging is fine throughout their life. In fact, these types of batteries suffer from low voltage, so it's actually much better to charge them, even if only a little, whenever you have the chance rather than to fully charge and fully drain them.
1. Use a dark colored background
2. Make apps darker too
3. Get rid of auto-brightness
Don't use display auto-brightness. It may sound good, but auto-brightness is usually way brighter than you really need. It's much better to manually set a super low brightness level that is still comfortable, and then just bump it up when necessary. This is one of the main ways to improve your battery life as the screen is one of the biggest battery suckers.
4. Vibrate away!
Switch off vibrate. Unless you really need that added awareness, turn off vibration. It actually takes more power to vibrate your phone than it does to ring it. Turn off haptic feedback too. Sure it feels cool, but it doesn't really add anything to your experience, and it's another battery drainer.
5. Don't use a knockoff
Only use original batteries or respected third party manufacturer batteries. Saving a few bucks on a battery that might damage your beloved smartphone is a poor choice indeed, and may also deliver sub-standard battery performance.
6. Having a timeout is good
Set your display's screen timeout to as short a time as is practical for you. Just think, if your screen timeout is set to a minute, it'll use four times the amount of power to have it on, every time you switch your screen on, than if your timeout is set to 15 seconds. Studies report the average smartphone user turns their smartphone on 150 times a day, so anything you can do to limit that frequency (through self-control or other methods listed below) will help keep your battery running for longer.
7. Get your notifications to leave you alone at night
Set ''sleep times'' or ''blocking mode'' to switch off Wi-Fi and mobile data when you don't need them. If your phone is basically off limits at work, set your device to not ring, vibrate or connect to the internet while you're at work. Likewise, you can set your phone to airplane mode when you're asleep or use sleep or blocking modes to set up limits for what your phone does during certain times of the day, whether that's while you're asleep, at work or in a meeting. Get to know the specific settings your ROM offers. Not only will you have to fiddle with your phone less throughout the day (or night), but you'll be saving on battery life too.
8. Your phone doesn't have to be smart all the time
Turn off smart features like air gestures, smart scrolling and the like, Unless you really use these features every day, they're just using battery power for a feature you don't use.
9. Nor do you need to be connected 24/7
Turn off GPS, Bluetooth, NFC, Wi-Fi and mobile data whenever you don't need them. Turning off location data, or setting it to use Wi-Fi or 3G data rather than GPS works perfectly well. Only turn on Bluetooth and NFC as long as you need them, and there's no need to have both Wi-Fi and mobile data turned on at all times. If you use Wi-Fi a lot though, say at home and at work, then it makes sense to keep set your Wi-Fi to ''Always on during sleep'' as this uses less power than to have your Wi-Fi reconnecting every time you wake your phone.
10. Try out Dynamic Notifications
Use lock screen widgets or notifications if your ROM supports them, or install an app that does it for you like Dynamic Notifications. You'll be able to get basically all your content without having to unlock your phone fully and navigating around. You still need to light your screen up, but you'll have it on for much less time than normal. using a lock screen notification app with a black background can save your battery life significantly.
11. Don't get bogged down by widgets
Ditch widgets you don't really need, especially those that are connected to the internet like weather widgets.
12. Don't let your apps fall behind the times
Keep your apps updated. There's a reason developers constantly update apps, and many of these reasons are memory and battery optimizations. Keeping your apps updated also means you have the best optimizations available. Likewise, delete old apps you no longer use, as these may be running background processes that chew up RAM and battery life.
13. Use your battery saving mode, now!
If your phone has a battery or power saving mode or other battery management option, make use of it.
14. Explore the battery saving features on your phone
All ROMs, whether it's stock Android, OEM UI's like TouchWiz or custom ROMs like CyanogenMod, have various settings in the menu to help conserve or optimize battery consumption here and there. Find these various options for your device and ROM and make them work for you!
15. Choose when you sync your data
Turn off auto-syncing for Google accounts. If you don't need every single Google account updated every fifteen minutes, just go into your Settings and Google account and turn off auto-sync for those apps you don't need constantly updated.
16. Be the master of your app updates
Set apps to update only when you launch them. If you rarely (or very frequently) open an app, it might be better to only have it update when you do so, rather than updating automatically all the time via push notifications or sync intervals. If you only check email once a day, why not let the app update then only, and if you're on a widget or app every couple of hours anyway then why not have it update each time rather than every fifteen minutes when you're not even looking at it
17. Be app update savvy in the Google Play Store
Change your Google Play Store settings to manual update your apps. If you have the Play Store set to auto-update, you might have fifteen apps updating when you least expect it, destroying your battery life (and data plan) without you realizing it. If you use even half of these battery saving tips you'll see a marked improvement in your battery life.
18. Turn off Google hotwords
Stop your phone from always listening. Google's "Ok Google" voice searching is a fantastic and often very functional feature. The problem is that it can play havoc with your battery. Go into "Google settings" from your app drawer and tap the "voice" heading. On the next page, select '"Ok Google' detection". In this menu, the best option for battery life would be to untick all boxed, but if you are a fan of "Ok Google", tick only the "From Google Search app" box to ensure your device is only primed while in the Google app.
19. Get rid of animations
Disable animations. This process may differ slightly from device to device but the crux of it should remain the same. Go to your settings and to the "about phone" page. Tap on the "build number" around 7 times. You will be notified that you have become an "Android developer" (don't worry, enabling the Android developer options doesn't have any adverse affects, it just adds another option in your settings menu). Go back to your settings and tap on the newly inserted "developer options" menu at the bottom. On the next page, scroll down to where it says "window animation scale," "transition animation scale" and "animator duration scale", and switch all of these off. Your device's interface may no=longer look as pretty, but the battery life will be better.
20. Make your location services more battery-friendly too!
Turning off location services isn't just a fantastic way to save on your battery, it saves on your data plan too! Go into your settings and you will find "location" under the "personal" heading - tap on it. At the top of the next page it you will see "mode" in this menu you will be able to set the options for how your smartphone determines your location. Select "battery saving" on the following page.
#Courtesy to Android Pit.
Click to expand...
Click to collapse
essentailly you are saying that we should use feature phone instead of smart phone and please dont jjust copy paste
phone reboot automaticaly again and again
prembaranwal said:
Hi android users,
I got a new micromax yureka and am having an issue of battery drainage from the very first day. I just installed few apps like whatsapp, facebook, mx player etc. Sometime later, I observed that my battery is discharging very soon. It seems like, can discharge from 100% to 0% in just 2-3 hours.
I checked the battery status and found that "Media Server" is listed on the top with 51%. For this, I did this:
Settings-> Apps ->All, select Media Storage & disable it. Clear data & reboot. Now enable it & reboot.
Referred from: http://forum.xda-developers.com/yureka/help/solve-battery-drain-issue-yu-yureka-t3015549
Now somewhat battery is discharging slowing but still results are not good. Also, mobile is charging very slowly. (Say <=20% in an hour). I googled other solutions for this problems, but none worked. Can anyone help me in this?
PS: My device is not rooted.
Click to expand...
Click to collapse
ye try kiya now phone on hi nhi ho raha apne aap restart ho raha h
I too faced same problem...Hard rest ur phone check out in YouTube how to hard reset yureka
my yureka phone is not getting charge just this phone is giving me lots of pain what i will do give me salution about yureka
When i install torrentz , my phone battery life drains like crazy. Help me out ??
prembaranwal said:
Hi android users,
I got a new micromax yureka and am having an issue of battery drainage from the very first day. I just installed few apps like whatsapp, facebook, mx player etc. Sometime later, I observed that my battery is discharging very soon. It seems like, can discharge from 100% to 0% in just 2-3 hours.
I checked the battery status and found that "Media Server" is listed on the top with 51%. For this, I did this:
Settings-> Apps ->All, select Media Storage & disable it. Clear data & reboot. Now enable it & reboot.
Referred from: http://forum.xda-developers.com/yureka/help/solve-battery-drain-issue-yu-yureka-t3015549
Now somewhat battery is discharging slowing but still results are not good. Also, mobile is charging very slowly. (Say <=20% in an hour). I googled other solutions for this problems, but none worked. Can anyone help me in this?
PS: My device is not rooted.
Click to expand...
Click to collapse
Hello!
The perfect way is to root your device! (Note that rooting YU doesn't void Warranty) .
By Rooting, you can install many battery saving apps like Greenify which puts all the apps into Hibernation, which prevents them from running in background when not in use! And also, this is done automatically if your device is rooted!
If you install a custom Recovery like CWM or TWRP, you can flash custom Kernels, which give you the complete access to customize everything(literally) of your hardware and if you optimize the settings correctly, the battery life will be Awesome!!
Hope this Helped! :laugh: If it did, hit the Thanks:good: button! And hesitate not to ask anything regarding this!
I thought this was important enough to move out of the Volume Control--USB Audio thread as it contains some information which runs counter to prevailing beliefs and suggests a way to test these beliefs.
This report is the result of my struggles to figure out the power drain issue with Phone.apk since I discovered that enabling it restores the volume "button" control over Media volume. Be prepared to be surprised. I was.
If you search online for issues with the generic "phone.apk" and battery consumption you will see the same drum beat over and over. Nearly everyone is convinced that the app is eating up their battery (even when they don't actually have a phone). They cite the battery usage stats which show the "cell standby" process (whatever that is) eating up huge percentages of the battery life. They also (mostly) cite a marked increase in battery life (and a disappearance of the "cell standby") when the app is deleted or disabled. Some also claim that simply changing to "airplane mode" kills the "cell standby" process.
It's difficult to argue with someone's personal experience, but there are a few voices amidst the clamor which say something more or less like this:
The problem is that the statusbar in the systemUI process actually reports the status of cellular radio to the battery stats service. It apparently does know that there isn't a *connected* radio, and then incorrectly assumes there is an *unconnected* radio which would be consuming battery searching for a signal (if it existed!). So it is just reporting time to the service, and it is sending that number through some formula that computes battery usage and displays it.
I assure you (as someone who is a programmer, but more relevantly has common sense) that a nonexistent cellular radio is NOT consuming your tablet's battery. It is simply a stat reporting error.
Click to expand...
Click to collapse
But, you know, it is a well-established fact that disabling Phone.apk improves battery life. I don't claim to know very much about the Android operating system but as I've delved into this issue one thing has occurred to me that seems completely illogical. I don't understand all of what happens when a device is rooted, but I doubt that a whole bunch of system apps that were somehow disabled before rooting are suddenly enabled during rooting. So before the NST is rooted, surely the underlying Android 2.1 system is chugging along and none of the apps present is actually disabled. Why then, does Phone.apk suddenly become a current hog only when the device is rooted?
So my quest took me down the rabbit hole in an attempt to disable all functions of Phone.apk except the desired ability to control the media volume. This led me to track down obscure settings menus (for the curious geek: AnyCut in the PlayStore--be careful, some settings will cause a reboot), alter the settings.db file (the only place that seems to have any say about "airplane mode"). Would you have imagined that Phone.apk has data roaming set as default "on"? Ever wonder why Phone.apk never appears when enabled? Turns out it has a dependency on Contacts.apk which is absent from the NST. Anyway it was all for naught. By the time I was finished my NST was leaking power like a sieve even without Phone.apk re-enabled.
Fortunately I had an old backup from December and didn't have to restore too much. Back to square one and more reading. It eventually occurred to me that the Nook Color had been the source of some of the audio work, so I visited that forum. Didn't find anything. Of course the Nook Color has native audio capabilities. But I did find a long thread in which proponents and opponents "discussed" Phone.apk and its possible effect on battery drain. That and member @HotShotAzn (his research is here) led me to SystemPanel. The paid version allows you to monitor the system for as long as a week at a time and follow things like CPU usage, power consumption, what's running, etc. If you're interested in SystemPanel for yourself, there's an extensive overview of it here.
Lies, D*mned Lies, and Statistics
Before I lay out the data from my experiments, let me just disclaim the whole thing right now so that anyone with a different experience can still feel validated. I don't claim this study is definitive. To do it right, I should have restored my NST to stock, rooted and then compared power consumption with and without Phone.apk. I judged that as too tiresome although the backup capability of NookManager really would have made it rather easy.
My system: I am running rooted stock 1.21 with the most recently amended kernal that includes gussied up audio but I note here that the audio implementation in that kernal is not quite complete, being a few details shy of enabling full mic capabilities. I filled those in myself. I use NoFrills CPU governor to regulate the CPU between 300 MHz and 1 GHz, on demand. I run Tasker in the background for a number of things, principally to autostart/stop WiFi for those apps that need it, and to control/lock rotation on some apps. There's a lot of little stuff that fritters away a little CPU time in the background, like the BBC News, TuneIn Radio, etc. I also have all the B&N stuff going except for NookCommunity and Social, both of which I consider nagware.
Day 1-2: No Phone.apk
I fully charged my NST before retiring and let it do its thing overnight. It was down to 99% the next morning. I read lightly during that day and the next, but did nothing else with the device. You can see the power drop-off in section 1 of the first image below. Pretty good.
These are the basic stats from those two days:
Remaining charge: 92%
Active:
ADW
Home
Library
Reader
SystemPanel
Service-only processes
CloudService
com.bn.nook.affileddownloadservice
DeviceManagerService
Market
News and Weather
Settings
Tasker
TestCenterService
USB Audio
USB Host
WaveformDownloaderService
Inactive (cached) apps
AdAway
Email
Maps
Pandora
Shop
thumbnailservice
TuneInRadio
Internal System Processes
Android keyboard
android.process.acore
android.process.media
com.bn.cloud.svc:svc
com.google.process.gapps
system
Top apps
System Processes
system
SystemPanel
Days 3-4: Volume control "kludge"
I fully charged the NST before retiring and also briefly ran the USB Audio toggle app so I could use ES Task Manager to wake up the volume control as described here. Then I left the NST to sleep.
The next two days I read lightly as before, nothing more. I was shocked at the power drop-off as seen in section 2 of the first image below.
These are the basic stats from those two days:
Remaining charge: 50%
Active:
ADW
Home
Library
Reader
SystemPanel
Service-only processes
CloudService
com.bn.nook.affileddownloadservice
DeviceManagerService
Market
News and Weather
Settings
Tasker
TestCenterService
USB Host
WaveformDownloaderService
Inactive (cached) apps
AdAway
Email
Maps
Pandora
Screenshot Easy
Internal System Processes
Android keyboard
android.process.media
com.bn.cloud.svc:svc
com.google.process.gapps
system
Top apps
system
TestCenterService
SystemPanel
You can see from the plot that the discharge rate and CPU usage are both elevated for that two-day period. The Top Apps have also changed. "system" has moved up and TestCenterService has made the top three (the list is much longer). I more deeply investigated both of these and, sure enough, the increased CPU activity comes mainly from "system" (which I believe is the underlying Linux, as opposed to "System") and to a smaller extent, TestCenterService (com.bn.serviceone). What exactly is going on when the volume control kludge has been executed is anyone's guess, but it's clear that the result and any side effects continue to propagate through the CPU until a reboot, even when USB Audio is not in use.
I couldn't believe this result so after wrapping up all my tests today I disabled Phone.apk again, rebooted and set up the volume control kludge using ES Task Manager. Immediately the undercurrent of increased CPU usage showed up in the real-time stats from SystemPanel. So whatever volume control strategy you choose, it probably should not be this one.
Days 5-6: Phone.apk enabled
After enabling Phone.apk I rebooted (cancels effect of kludge), fully charged, and left the NST to sleep overnight. The next morning, I was down to 98% battery. So far so good.
I read for the next two days, as before, although perhaps a little more heavily since I got into a good mystery You can see the power drop-off in section 3 of the first image below. It's very similar to the first two days without Phone.apk enabled, and certainly MUCH better than that of days 3 & 4.
These are the basic stats from those two days:
Remaining charge: 91%
Active:
ADW
Home
Library
Reader
SystemPanel
Service-only processes
com.bn.nook.affileddownloadservice
DeviceManagerService
Market
News and Weather
Set Cover
Settings
Tasker
TestCenterService
USB Audio
USB Host
WaveformDownloaderService
Inactive (cached) apps
AdAway
Email
ES Task Manager
Google Partner Setup
Maps
No Frills CPU Control
Pandora
TuneIn Radio
WiFi File Transfer
Internal System Processes
Android keyboard
android.process.acore
android.process.media
com.bn.cloud.svc:svc
com.google.process.gapps
Dialer
system
Top apps
system
System Processes
SystemPanel
There's some jockeying for place among the various apps and services, but the bottom line (or rather the top one in this case) is that the remaining charge after two days is essentially the same as without Phone.apk running.
Of course there is no mention of the mysterious "cell standby" in all of these stats. You'll notice that the Dialer shows up low on the list of Internal System Processes. For the curious I called up the details on that. They are in the second image below. Clearly, enabling Phone.apk has nothing to do with battery life on my NST. But it does give me full volume control without any silly kludge that can't be explained and actually consumes even more juice. And now that I'm done with my experiments I don't need the SystemPanel monitor on so that will save a little more juice
YMMV.
I've found that the free GSam Battery monitor is very useful for tracking down apps that drain the nook. http://bit.ly/1Xclacj . I found two apps that I had installed that were trying to call home and draining my battery.