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  1. Thread Author  Thread Author    #1  

    Default 35 hours, 90% battery left, on "standby"

    I didn't have much time to use my tablet the last two days. And I kept WiFi & screen off except for about 25 minutes. But, I never shut it down completely, just closed the case.

    I was able to get 35 hours on only 10% battery. So there is 90% left. Theoretically I could go like this for 350 hours (14 1/2 days). Pretty amazing. See the attached screen shot.

    But, why would I have a tablet if I only used it for 10 minutes a day?!!!!

    Sent from my SM-P900 using AC Forums mobile app
    Attached Thumbnails Attached Thumbnails 35 hours,  90% battery left, on "standby"-1407538411929.jpg  
  2. #2  

    Default Re: 35 hours, 90% battery left, on "standby"

    It's good when you splash all that cash on a new device and it throws a few unexpected delights at you. Sorta mitigates "buyers remorse" a lot!
  3. #3  

    Default Re: 35 hours, 90% battery left, on "standby"

    I am also impressed with my Note Pro's battery life. Only 1% is deducted from my battery when I sleep at night (unlike my note 10.1 2014e).
  4. #4  

    Default Re: 35 hours, 90% battery left, on "standby"

    Brag while its new. Something has to be said when you plug your tablet in at night and decide to sleep in to wake up with it only at 65%
  5. #5  

    Default Re: 35 hours, 90% battery left, on "standby"

    Is that a charger, cable or tablet issue though?

    I've had cables go bad and chargers go bad. I've also have tablets act up as well, my 2012 Nexus 7 is finicky now that its a couple of years old.
  6. #6  

    Default Re: 35 hours, 90% battery left, on "standby"

    What note do you all have? My dies when I sneeze. I charge it and turn it off and the battery drains. I don't do much and it dies.. So tell me about these hours

    From Peaches Galaxy Note 3
  7. Thread Author  Thread Author    #7  

    Default Re: 35 hours, 90% battery left, on "standby"

    @Grimgrak, @Peaches36 I have SM-P900 32gb version - Samsung Galaxy Note Pro 12.2 SM-P900 (WiFi) [32GB & 64GB]

    It looks like there are 4 versions. SM-P900, SM-P901, SM-P905, SM-P905V
    Details here -> http://www.thegalaxytabforum.com/ind...pecifications/

    Which one do you have and how long have you had it?


    Sent from my Samsung Galaxy Note Pro 12.2" (they really need a shorter name for this awesome tablet)
  8. #8  

    Default Re: 35 hours, 90% battery left, on "standby"

    Goin_nil's exceptional standby times are in large part due to the fact that nothing is establishing a wakelock as evidenced by the low number of tick marks in the awake line on the battery summary screen shots being posted. The kernel on these tablets is very good in terms of bringing the cpu down to a low power state when usage is minimal.

    If yours is dying fast in standby then something is running in the background keeping the tablet awake and you'll see that in the battery summary page. To figure out what it is you'll need to pay attention to what applications are ranking at the top of the battery usage list. Using third party battery monitoring tools helps find wakelocks too (like Better Battery Stats or GSAM Battery Monitor).

    Sometimes an application goes rogue, and sometimes it's merely that sync settings for certain applications are set frequently enough that the device hardly sleeps. Imagine for example if a dozen apps were set to sync every 15 minutes but they each fired off a minute apart. Overnight the cpu would have very little time to rest.

    Sent from my SM-P900 using Tapatalk
  9. Thread Author  Thread Author    #9  

    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by muzzy996 View Post
    Goin_nil's exceptional standby times are in large part due to the fact that nothing is establishing a wakelock...
    That's a great point @muzzy996. Recently I've been trying to do a few things when I know I'm not going to be using the tablet for a few hours. I read this on some forum, maybe this one.
    1. Force close all apps from the recent apps list.
    2. Clear the RAM.
    3. Turn Wifi off.

    But, I don't turn the tablet off. I just turn the screen off (ie close my case).

    I checked my battery graph during the times when I've done this and the battery percentage has been a flat line for hours, even over night it did not drop one percentage point.

    Sent from my SCH-I535 using AC Forums mobile app
  10. #10  

    Default Re: 35 hours, 90% battery left, on "standby"

    Yeah you're living proof that it helps!

    Left alone though I think you'll find that it won't be too bad either. Sometimes people are unlucky in the applications they install and a single sour grape can spoil the wine so to speak.

    I love my Note Pro . . It gives me the best battery life I've ever seen out of an Android device. I never thought I'd see the kind of standby times that I do with one, but I'm able to leave Wifi on 24-7 without worry and walk away from the tablet without fear of returning to a battery that has been significantly drained 24 hours later. At most perhaps I'll see a 10% drain overnight but it is more common for me to see much less than that over 8 hours that I'm sleeping.
  11. #11  

    Default Re: 35 hours, 90% battery left, on "standby"

    On light usage I can get well over a week.

    Sent from my SM-N9005 using AC Forums mobile app
  12. #12  
    RoyalWulf's Avatar

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    Default Re: 35 hours, 90% battery left, on "standby"

    This is day 4 with my Galaxy Note Pro 12.2 and I barely get a working day with it, I can't use it at night after using it all day :-(
    Bit disappointed.
    I don't use it heavily during the day but it is on and wifi is on all day.
    I have other tablets with better battery life.
  13. Thread Author  Thread Author    #13  

    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by RoyalWulf View Post
    This is day 4 with my Galaxy Note Pro 12.2 and I barely get a working day with it, I can't use it at night after using it all day :-(
    Bit disappointed.
    I don't use it heavily during the day but it is on and wifi is on all day.
    I have other tablets with better battery life.
    That would be very frustrating.

    Have you tried using apps to help monitor the battery usage and identify apps that are sucking the most battery?

    I'd recommend GSam - https://play.google.com/store/apps/d...m.gsamlabs.bbm

    I've also found that the more apps you have than use the Internet the quicker the battery drains because of all the background activity.

    Have you tried closing apps down when you are not actively using them? My kids played a game on mine and then let it sit idle with the screen off for a few hours. When I went to use the tablet the battery had drained quite a bit.

    Do you have the wifi only tablet or the cellular tablet?
  14. Thread Author  Thread Author    #14  

    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by RoyalWulf View Post
    This is day 4 with my Galaxy Note Pro 12.2 and I barely get a working day with it, I can't use it at night after using it all day :-(
    Bit disappointed.
    I don't use it heavily during the day but it is on and wifi is on all day.
    I have other tablets with better battery life.
    How many hours of screen time do you get? You can see this at the end of each day (before you charge it) in the Settings | Battery | Screen.

    Sent from my SCH-I535 using AC Forums mobile app
  15. #15  
    RoyalWulf's Avatar

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    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by goin_nil View Post
    That would be very frustrating.

    Have you tried using apps to help monitor the battery usage and identify apps that are sucking the most battery?



    I've also found that the more apps you have than use the Internet the quicker the battery drains because of all the background activity.

    Have you tried closing apps down when you are not actively using them? My kids played a game on mine and then let it sit idle with the screen off for a few hours. When I went to use the tablet the battery had drained quite a bit.

    Do you have the wifi only tablet or the cellular tablet?


    cellular tablet
    Rather not have to close things down.

    At the moment I don't have many apps apart from stock, are there any issues with the stock ROM and apps?
  16. #16  
    RoyalWulf's Avatar

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    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by goin_nil View Post
    How many hours of screen time do you get? You can see this at the end of each day (before you charge it) in the Settings | Battery | Screen.

    Sent from my SCH-I535 using AC Forums mobile app
    Hmmm, Yes the screen was taking 46% of the battery, i have turned the brightness down to see if that helps
  17. #17  

    Default Re: 35 hours, 90% battery left, on "standby"

    Guess it depends on room conditions but typically for me I run my tablet at perhaps 15% brightness at home in the evenings and 30% to 50% in the office during the day.

    That battery stats page in Settings-General-Battery is helpful in determining battery consumption.

    Tapping items ranked in the list below the graph and paying attention stay awake stats for example can assist in determining applications that are keeping the tablet from fully sleeping when not in use leading to high drain in standby.

    Tapping the battery graph itself helps determine how much time the tablet stays awake vs having its screen on. If there's a lot of tick marks on the Awake line while the screen is off then you're likely going to see more drain during standby for example. Also for LTE device users there will be a colored indication of signal strength which should also correlate with rate of discharge at the top. Low signal strength will result in increased drain in standby.
  18. Thread Author  Thread Author    #18  

    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by RoyalWulf View Post
    cellular tablet
    That's what I was wondering. You might be having quicker battery drain (more so than a WiFi only tablet) from the 4G trying to get a signal and if the cellular signal is weak (father away) or you cellular antenna has to work harder to keep a 4G signal (such as when in a building). That can cause significant battery drain.

    Do you notice the tablet getting warm or hot when using 4G? Heat quickly drains a battery and shortens it's life span too.

    How often are you in cellular 4G vs 3G vs 1x? And how strong (# of bars) is your cellular signal? All things to keep an eye on.

    If you are primarily on WiFi during the day, you should turn off the cellular antenna (sorry, can't remember how).

    Sent from my SCH-I535 using AC Forums mobile app
  19. #19  

    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by goin_nil View Post
    @Grimgrak, @Peaches36 I have SM-P900 32gb version - Samsung Galaxy Note Pro 12.2 SM-P900 (WiFi) [32GB & 64GB]

    It looks like there are 4 versions. SM-P900, SM-P901, SM-P905, SM-P905V
    Details here -> http://www.thegalaxytabforum.com/ind...pecifications/

    Which one do you have and how long have you had it?


    Sent from my Samsung Galaxy Note Pro 12.2" (they really need a shorter name for this awesome tablet)
    I have the 32g wifi version. Bought it in May. When I'm home I have to leave it plugged in, because when I unplug it there goes the battery. I kill apps, clean the cache, and delete apps I think is draining the battery. I'm at the point where I'm looking to buy a Mophie battery pack for when I'm traveling.

    From Peaches Galaxy Note 3
  20. Thread Author  Thread Author    #20  

    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by Peaches36 View Post
    I have the 32g wifi version. Bought it in May. When I'm home I have to leave it plugged in, because when I unplug it there goes the battery. I kill apps, clean the cache, and delete apps I think is draining the battery. I'm at the point where I'm looking to buy a Mophie battery pack for when I'm traveling.

    From Peaches Galaxy Note 3
    Hi Peaches36

    It sounds like there could be some app misbehaving (this has happened to me more than once). Most likely the tablet and battery are just fine. Have you done a factory reset and NOT installed any apps for a day or two to see how long the battery lasts? Then start to add back the apps slowly.

    Have you tried troubleshooting and look for heavy battery consuming apps with tools like :
    GSam - https://play.google.com/store/apps/d...m.gsamlabs.bbm
    System Panel - https://play.google.com/store/apps/d...pp.systempanel

    Also, post a screenshot of your battery stats graph (like I did above) and we might be able to get some info from that of what could be wrong.
  21. #21  

    Default Re: 35 hours, 90% battery left, on "standby"

    It's all about the apps and settings which is why we can never all have the same drain unless we all have fresh out of the box installs and log into the same accounts during setup. Once we deviate after initial setup by using accounts with different activities (email volume for example) everything changes. Placing different widgets on the home screen without ever installing any other apps is enough to result in different battery consumption statistics.

    The biggest culprits for drain that I've personally had were exchange set to push and other sync related settings for various applications like weather apps or news apps. The concept is simple, to minimize standby drain the CPU has to be able to go to idle for the maximum amount of time when the tablet is not in use. With dozens of applications (widgets are apps too!) all trying to sync or get information in the background at various intervals its easy for the CPU to be awake too much and the result will be heavy battery drain.

    So focus when hunting for applications needs to start with sync intervals of all applications. For example my email app of choice (aquamail) allows a custom sync interval when the screen is off so I set that to every half hour. My weather apps/widgets are set to check conditions once an hour. Notifications on all nonessential apps are disabled so the only notifications that I leave on are for messaging applications and email. I uninstalled Facebook since that application had been notorious for drain (I use Dolphin instead with flash installed).

    3rd party battery monitoring tools helps find wakelocks. Better Battery Stats is one, GSAM Battery Monitor is another. Some require root for better functionality but do have useful information without root. The key to using those is to do a fresh reboot when unplugged and not touch the tablet for an hour or two. Then come back and look for wakelock counts on all applications. Then starting with the highest-ranking applications try to change notification or sync settings and then repeat the testing process.

    Root users have the best chance of maximizing battery life by forcing stubborn applications into hibernation using tools like Greenify or outright disabling them when they aren't wanted (I have probably a few dozen apps and services frozen in titanium backup that came with the tablet stock).

    Sent from my SM-P900 using Tapatalk
  22. Thread Author  Thread Author    #22  

    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by muzzy996 View Post
    It's all about the apps and settings
    ...
    The biggest culprits for drain that I've personally had were exchange set to push and other sync related settings for various applications like weather apps or news apps.
    You are exactly right, muzzy996. Very good advice to check the app sync settings.

    I had a battery drain issue with my work email sync through exchange. I changed the sync from "push" to "15 minutes" for peak time (ie M-F 8am - 5pm) and "1 hour" for off-peak time. Exchange Services went from the biggest battery hog to nothing.

    Another time my calendar app went crazy (stuck in an endless loop) and I could literally watch the battery percentage drop a percent or two every minute - it was nuts. But, I worked with the developer (great guy) and he fixed the bug.
  23. Thread Author  Thread Author    #23  

    Default Re: 35 hours, 90% battery left, on "standby"

    An analogy comes to mind -

    Drastic battery drain when a tablet is not used much is like driving a car in heavy traffic and revving the engine constantly when you are stopped (ie when the screen is off or apps are closed). You will run out of gas much quicker than the guy who takes it easy and only presses the gas peddle when it's really needed.

    Not to say that it's the users fault but rather poorly designed/configured apps that keep their foot on the gas when it's not really needed.

    Even if we are careful to close all apps when the tablet is going to be sitting idle for a bit, there are always background/hidden services running for some apps (like exchange or Facebook). Configured properly, their impact can be greatly minimized.
  24. #24  
    RoyalWulf's Avatar

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    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by goin_nil View Post
    That's what I was wondering. You might be having quicker battery drain (more so than a WiFi only tablet) from the 4G trying to get a signal and if the cellular signal is weak (father away) or you cellular antenna has to work harder to keep a 4G signal (such as when in a building). That can cause significant battery drain.

    Do you notice the tablet getting warm or hot when using 4G? Heat quickly drains a battery and shortens it's life span too.

    How often are you in cellular 4G vs 3G vs 1x? And how strong (# of bars) is your cellular signal? All things to keep an eye on.

    If you are primarily on WiFi during the day, you should turn off the cellular antenna (sorry, can't remember how).

    Sent from my SCH-I535 using AC Forums mobile app
    My mobile has two sim slots so I put one in for each telco. I have no coverage at home with one of them and I found it was draining my battery trying to find a signal. When I took the sim out it solved that problem. Currently I don't have a sim in the tablet. Should it still be draining the battery?
  25. #25  
    RoyalWulf's Avatar

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    Default Re: 35 hours, 90% battery left, on "standby"

    Quote Originally Posted by goin_nil View Post
    Hi Peaches36

    It sounds like there could be some app misbehaving (this has happened to me more than once). Most likely the tablet and battery are just fine. Have you done a factory reset and NOT installed any apps for a day or two to see how long the battery lasts? Then start to add back the apps slowly.

    ...

    Also, post a screenshot of your battery stats graph (like I did above) and we might be able to get some info from that of what could be wrong.
    It's amazing what apps cause problems, my Mum had a card game that cost heaps in 3G. I had an app that told me my mobile balance and after an upgrade to the app it drained my battery in a few hours, it took ages to find it out of the 40 odd apps.
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