Miui Battery Life

Discussion in 'Team D1-MIUI' started by Jswerv3, Jan 30, 2011.

  1. Jswerv3
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    Jswerv3 New Member

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    Flashed to Miui for the first time this week.. why is the battery life so awful?
    what can i do to make it better.. im kind of a noob at this stuff and still learning and im not really sure what a "kernal" is so maybe that has something to do with it? lol

    [​IMG]
  2. omala
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    omala New Member

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    try using jamezelle's kernal it will help speed up the phone as well as increase battery life greatly
  3. Jswerv3
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    Jswerv3 New Member

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    how do I install a kernal?
  4. mwhartman
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    mwhartman Super Moderator/RS Premium Member

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    Download and install via SPR or CW. Do not wipe.
  5. Jswerv3
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    Jswerv3 New Member

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    what is SPR or CW? lol sorry im a n00b
  6. TRIKOTRET
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    TRIKOTRET New Member

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    the way you installed the rom you can install the kernel but no wipe
  7. Droidarola
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    Droidarola New Member

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    i didn't use any kernel at all, im stock and i just switched yesterday and the phone runs fast and my battery life is pretty damn good. I switched from BB because i was having battery life issues and so for i love this rom.
  8. SirVilhelm
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    SirVilhelm New Member

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    Where can we find his kernel?
  9. michael_campbell
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    michael_campbell New Member

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    look in the compcache thread. Be careful though, it seems rather twitchy. It seems to not work on a lot of phones (mine is one, and it's the first kernel my phone didn't like, and I've tried damn near all of them.)

    So, backup before you flash it!
  10. blumpkinblake
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    blumpkinblake New Member

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    The battery life is pretty crappy no matter the kernel I'm on.

    Sadly I don't think I've made it past like 6:30pm on any given day. The display is down all the way unless I'm outside. Could be the new "1500" mAh battery I got from Seidio.
  11. djssupp
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    djssupp New Member

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    If you flashed the ROM while not fully charged, you stand a great chance that the battery stats are now incorrect. The battery stats (/data/system/batterystats.bin) are what the ROM uses to determine how much charge is available on the battery. If you _did_ flash with less than 100% battery (and not plugged in) then your stats get locked in to the battery charge you had at flash time. This can be fixed, though.

    You can use a number of apps to find out hoe much juice is in your battery - I use a program called Battery Stats to give me an idea of the voltage available in the battery (My 100% charged battery shows 4.198V after proper calibration). Most batteries will hold a similar amount of juice. If you notice that at 100% charge you have much less thatn that, you're destined to experience poor battery life.

    Now to re-calibrate the battery...

    Plug in your phone. Let it charge to what it thinks is 100%.
    Delete /data/system/batterystats.bin
    Unplug the phone.
    Run the battery down until the phone shuts itself off. (I like to enable all radios - Bluetooth, WiFi, GPS. Turn on the light for the camera flash - torch in the notification drawer - then load up Google Maps and start navigating to someplace, and play some videos. If you have a metal box, like an army ammo box, put the phone in there - it acts as a Faraday cage killing off all the radio connectivity, causing the phone to burn through battery searching for a signal.)
    Plug in the phone in and charge until the phone shows 100% charge.
    Unplug the phone.
    Run the battery down until the phone shuts itself off.
    Plug in the phone in and charge until the phone shows 100% charge.
    Unplug the phone.

    Enjoy your freshly calibrated battery.

    Let us know how your battery life is afterward.
  12. TheTyler0013
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    TheTyler0013 New Member

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    I am not so thrilled about battery on this either, but its the best ROM I have used so far, I hope battery improves in long run

    Sent from my Droid using DroidForums App
  13. lithoman
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    lithoman New Member

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    Any more help on finding that Battery bin. I have searched to no avail. What program are you using ..i have tried File Explorer and OI File manager....nothing
  14. djssupp
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    djssupp New Member

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    I usually use Android Terminal Emulator or adb on my laptop. If you install terminal emulator, try the following:

    mv /data/system/batterystats.bin /mnt/sdcard/batterystats.bin.bak

    That'll move the stats file onto your SD card (although it's probably not necessary after a new one is generated). After doing so, reboot. But don't forget that you MUST have a full charge before doing this, or else you'll mess up the stats recorded into the new file.

    Also, if you are running Rom Manager and had it install Clockwork Recovery, you can reboot into recovery, go to advanced, and select Wipe Battery Stats.

    Lemme know how you fare.
  15. lithoman
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    lithoman New Member

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    thanks....Clockwork Recovery was the way to go...will let you know how this works out
  16. TheTyler0013
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    TheTyler0013 New Member

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    I am having amazing life now, I am running chevys ulv 1.25 kernel and I get close to a full day. I txt, call, surf web & app store, and music.

    Sent from my Droid using DroidForums App
  17. toastedoats
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    toastedoats New Member

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    I was getting 12-14hrs with MIUI, decided to give CM7 nightlies a shot and am seeing 16-18 hours with CM.

    I still havent decided if the battery improvement is worth sacraficing MIUI
  18. The Kid Cassidy
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    The Kid Cassidy New Member

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    I just dont understand how you guys get such bad battery life? with moderate use not heavy on the internet look at my up time and the amount of battery still left and my stats are calibrated right on the stock kernal!

    IDK maybe some phones are different but i have never ran a rom that lasts as long as Miui
    Last edited: Feb 15, 2011
  19. daddyshatch
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    daddyshatch New Member

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    My battery life has always sucked with MIUI but not with the new build. Been off the charger since 9 am and I'm still @ 50%.. would have had to charge already with previous builds.

    Sent from my Droid using DroidForums App
  20. mwhartman
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    mwhartman Super Moderator/RS Premium Member

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    During the day I get fantastic battery live. However, at night, when I turn my phone off I can have 50% or 60%. In the morning, I have a 5% reading and need to charge. I've left the battery completely discharge several times then recharge but stil have the same results.

    I would believe the battery would discharge while on not when off.
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