Battery drain after latest FOTA update

support01support01 Level 1
edited January 2021 in ZenFone 5 Series

Please tell us some basic information before asking for help:

  1. Model Name: 5z
  2. Firmware Version: latest Dec 2020 FOTA
  3. Rooted or not: not
  4. Frequency of Occurrence: every moment
  5. APP Name & APP Version (If your issue relates to the app)

Wifi / Mobile Data On are sucking up battery.

What used to be a good phone before Dec 2020 fota update is rendered practically useless. Doesn't even last 10hrs on standby anymore and ...using phone for social media or online reading alone reduces battery to 4-5hrs of useful juice.

If wifi / mobile data is turned off, battery behaves normally again.

This shld be a priority for Asus to issue a fix ASAP instead of letting users wait for next scheduled FOTA.


  • AmitGardeAmitGarde Level 5
    edited December 2020

    Yes,very true and i would like to tell you that this is known issue & we are still discussing regarding real cause for drain & i hope we find something ASAP.

    Also i would like to inform you that as .110 included touch fixes with update,which was only possible with some CPU boosting and so please note that this will eat some battery whenever you touch. Also there are some fancy features like double tap,screen wake etc which will keep consuming some more battery in background which usually cannot be mentioned in battery SOT page.

    but you have to agree that system is more smoother (fluid) n faster with .110 than any other firmware 5z had.

    Better performance but less battery this is story for now. And belive me we are trying hard to get this battery fix AEAP.

    "To gain something we have to loose something"😁

    And that is what just like saying is we got performance & we lost battery backup🤓

  • Hi support01

    Thank you for your asking. Since you had mentioned idle battery drain, I just tested my device on V110, not in Safe Mode with Wi-Fi ON. Kindly refer to the picture below:

    1. If the "Fingerprint" is turn off, does the situation remain the same?


    2. You may also provide me the screenshot for checking. Turn on WiFi/turn off Mobile Internet and leave a 100%-charged phone in sleep(idle) mode in a night, then provide me the screenshot of 


    ②Setting>Battery>3 dots on the top"Show app usage"

    3. Also, please try "the Factory Reset" 

    Settings>System>Reset options>Erase all data(factory reset)

    Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.

    4. Is there any zone heating up while using/idling? How long has the battery been used? 

    For more information, please refer to the links below

  • AmitGardeAmitGarde Level 5
    edited December 2020

    He is not talking about idle drain and yes i agree with you there is less idle drain with latest firmware .110 so no problem with idle drain

    But drain problem starts when you use your device normally with data/wifi On from 100-2%

    I suggest you please full charge your device and use it normally until battery is 2% and share us your testing device SOT it will be very less i am sure lots of users are complaining that please see ZH as well as EN forum .110 is best with performance but battery consumption is alot, and its bothering us.

    I use to get 5hrs 30 min SOT with .99 and now with .110 i am only getting 4hrs 30 min or sometimes only 4hrs SOT

    SOT is not consistent with .110 please look into it

    Thanks! @Christine_ASUS

This discussion has been closed.