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Discussion in 'Android Devices' started by gmanw54, Nov 10, 2010.

  1. gmanw54

    gmanw54 Newbie
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    Just wondered if anyone knew why different ROM/kernel combinations work different for everyone's phones.

    I just don't understand how one ROM/kernel combination can work so well on battery life for one person but not another.

    I guess i'm just frustrated trying to find a good ROM/kernel combination that has great battery life.

    If anyone has any knowledge on this that would be greatly appreciated, thanks!
     

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  2. pinoy724

    pinoy724 Well-Known Member
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    I've been on Myn's2.2 with Kings#11 and getting 20-24hrs battery life on average use. Although, my average use and your average use might be different.

    Here is my SetCPU settings:

    Charge/Full- 1.19max-998min, performance, priority- 50
    Screen Off- 384max-245min, conservative, priority- 70
     
  3. andygu3

    andygu3 Android Expert
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    I don't think the rom/kernel combo has a lot to do with it. It's more of how the phone is set up. Widgets, syncing of data, bad service area.... All these factors will have different results for different phones
     
  4. ExSaint

    ExSaint Android Enthusiast
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    Some widgets drain the hell out of your battery. I just put an app shortcut instead of widgets.
     
  5. gmanw54

    gmanw54 Newbie
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    I've asked if people have their backround data, mobile and wifi toggled ON/OFF and most everyone that is getting good battery life seems to be able to leave all of these on. Some even leave GPS on which I know is a huge battery drain.

    I only have one widget, Audio Manager but under battery settings it does not seem to have much impact on battery life.
     
  6. ExSaint

    ExSaint Android Enthusiast
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    I always turn everything off. If I'm not using why have it on?, right?
     
  7. andygu3

    andygu3 Android Expert
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    My battery usually drains fast when I'm in a building and I can't get good service, therefore the phone has to work harder to sync everything
     
  8. Mr. Ed

    Mr. Ed Android Expert
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    Please explain how GPS is a huge battery drain.

    my tests show things like gps...screen etc all drain the battery minimally. Same for bluetooth (unless it is actually connected to something/active)
     
  9. TBon350

    TBon350 Member
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    Kernels are the low-level software that communicate with the hardware. Since the hardware specs are the same, but the hardware itself is different on everyone's phones, kernels and ROMS (which include kernels) work differently on everyone's phones.

    Most people I know of that are getting good to decent battery life do not leave these things on with the exception of Wifi.

    GPS is a battery drain, particularly when the screen is off. Essentially, nothing should be going on when the screen is off except possibly some data transfers for email, etc. (and even those should be limited if possible) When the screen is on and you are running applications that use GPS, battery drain may be minimal as you said, but there's no reason for the battery to drain additionally when the screen is off. Bluetooth, GPS, and 4G should all be off when the screen is off.

    Wifi on the other hand should be on whenever you have access to a Wifi network and aren't moving around. It appears that the battery drain of Wifi is less than that of even the 3G because 3G signal bounces up and down and causes the battery drain to be worse than when Wifi is enabled.
     
    gmanw54 likes this.
  10. Screw it. I leave GPS on all the time. I like Google searches and weather to know my exact location when I use them and I'm too lazy to go turn it on every time.
     
  11. gmanw54

    gmanw54 Newbie
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    I understand what you are saying but if one person tries the exact same ROM/kernel combination as another person, why do they get different results. Sometimes major results?

    I mean there are only a few variables that could change from one persons use to another. I've just tried many different combos that people say they are getting 20+ hours of batter with 40-50% battery left and i'm barely getting 12 hrs with light to medium usage. I am getting 3g signal all day and I leave it on WiFi when i'm home.
     
  12. Here is my best understanding of it:

    The kernel essentially determines how your phone's resources are going to be utilized. What gets the highest priority, how quickly it operates, etc. The widgets, data sync patterns, apps, up/awake time, settings, coverage, WiFi availability, and everything else that are unique to you will utilize what a kernel does differently than every other user. For some people, a particular kernel "just works". For others, it does not.

    Frankly, the 20+ hours with 40-50% battery life people are nothing I strive for in the least. I guarantee that I use my phone more than most people that post on here, so my 14 or so hours until fully discharged is perfectly acceptable to me. I want GPS always at the ready, I want my e-mail syncing as much as possible, I fire up my internet browser frequently, and I take my phone in to the shitter and play power hungry games.

    Use a ROM/kernel combo for a few days and get an idea of how long it lasts. Then try to change one or both of them out and see how long that lasts after a few days. The baseline is what results you get with "normal" use, not what someone else posts on a message board. When people post battery results from a ROM/kernel, really, the only relevant info is how much more (or less) battery life they got compared to what they normally receive. The actual number of hours is moot, since I will never use my phone in exactly the same fashion that they do.
     
  13. TBon350

    TBon350 Member
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    You're speaking only to battery consumption, which in my opinion is differing between users in large part due to applications installed and running as well as system configurations. I think a lot of battery consumption issues (or differences from one user to another with the same Kernel/ROM combo) are due to updating New, updating eMail, updating Weather, etc. Your best bet IMO is to set everything to update manually to start out and turn 4g and GPS off. Slowly set the updates to occur more frequently and/or turning on 4g or GPS (these are so easy to flip on and off with the toggle, I don't find it inconvenient) until you reach a compromise between battery length and feature functionality. You may also say that you hardly use your phone and get 12 hours, but are you turning the screen on and off a lot? Download Spare Parts from the market, and click on battery history. The amount of time your screen has been on and the amount of time CPU has been processing will clue you into why your battery performance is so poor.

    I agree. Most people making these extravagant claims of great battery life aren't doing a whole lot with their phones other than the occasional phone call and texts. I use mine quite a bit more with playing music at work and games. I think getting a day's worth out of your battery is more than sufficient with the amount of things these phones are capable of, and I'm able to get that even with my moderate to heavy use.
     
  14. Mr. Ed

    Mr. Ed Android Expert
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    Hrmmmm......u guys have it pretty well covered. I think each users use and settings make it hard to determine any amount of consistency. I was under the impression that gps and bluetooth had pretty well been proven to only effect battery life when called upon...and my battery usage statistics match exactly that but by no means do I want you to change something that's working for you.


    Heavy user...stock battery never got me more than 10 hrs ....now I can squeeze out 16 or so on the sprint extended. Much more with mild usage.


    I will also add I am rooted and have tweaked MUCH. Screen off for 3+ hours= no battery drain at all. Just the way it should be :)
     
  15. flyjbaker

    flyjbaker Android Expert
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    Yep...GPS does not drain when it is not in use...or it drains very minimally. I think it does keep track of where it is via aGPS....but then has a quick and easy hotstart when it is called upon.
     
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