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

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  • 08-21-2014, 07:25 PM
    RoyalWulf
    Re: 35 hours, 90% battery left, on "standby"
    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?
  • 08-21-2014, 07:27 PM
    RoyalWulf
    Re: 35 hours, 90% battery left, on "standby"
    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
  • 08-21-2014, 09:21 PM
    muzzy996
    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.
  • 08-22-2014, 12:18 AM
    goin_nil
    Re: 35 hours, 90% battery left, on "standby"
    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
  • 08-22-2014, 02:07 AM
    Peaches36
    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)
    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
  • 08-22-2014, 10:42 AM
    goin_nil
    Re: 35 hours, 90% battery left, on "standby"
    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.
  • 08-22-2014, 11:03 AM
    muzzy996
    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
  • 08-22-2014, 01:42 PM
    goin_nil
    Re: 35 hours, 90% battery left, on "standby"
    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.
  • 08-22-2014, 01:50 PM
    goin_nil
    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.
  • 08-22-2014, 08:02 PM
    RoyalWulf
    Re: 35 hours, 90% battery left, on "standby"
    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?
  • 08-22-2014, 08:15 PM
    RoyalWulf
    Re: 35 hours, 90% battery left, on "standby"
    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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