Battery consumption in airplane mode

Discussion in 'Apple Watch' started by dcaccount, Oct 9, 2016.

  1. dcaccount macrumors regular

    Joined:
    Nov 17, 2013
    #1
    hello,
    I have just bought an Apple Watch Series 2 and yesterday night to keep some battery for today, I have put the watch in airplane mode.

    To my surprise, this morning when I checked battery status, I discovered that it drained from 62% to 30% in one night.

    My question is if it normal. What is your experience?

    Thanks,
    Daniele
     
  2. Relentless Power macrumors Core

    Relentless Power

    Joined:
    Jul 12, 2016
    #2
    I'm assuming you didn't have it on the charger. Also, you may have had active applications running, 'Hey Siri' could be on, which uses the microphone for Listening to start.
     
  3. dcaccount thread starter macrumors regular

    Joined:
    Nov 17, 2013
    #3
    Yes, it was not on the charger.
    How can "heli Siri" be on with the watch in airplane mode?
     
  4. Relentless Power macrumors Core

    Relentless Power

    Joined:
    Jul 12, 2016
    #4
    Then your misunderstanding, because if Hey Siri is on, it utilizes the microphone to search for your voice, regardless if Airplane Mode Is on. All Airplane mode does is disable the wifi and Bluetooth connection to your Phone. If the Watch is in Power Save, then only the time is active.

    Again, if you have active applications running, this could be a contributing factor.
     
  5. dcaccount thread starter macrumors regular

    Joined:
    Nov 17, 2013
  6. exxxviii macrumors 65816

    exxxviii

    Joined:
    May 20, 2015
    #6
    Depending on how many hours is "night," that sounds about right. The watch drops about 2-3%/hour in normal use. So, 8 hours would be on the order of the 30% drop you saw. Airplane mode is not a power saving mode, it simply turns off the radios. Those barely consume any power.
     
  7. ManicMarc macrumors 6502

    Joined:
    Jul 1, 2012
    #7
    The microphones for 'hey siri' are only listening when the device is unlocked, and the screen is on. If you leave the watch on a table and start yelling 'hey Siri' at it, it won't do anything.
    The most likely cause of battery drain is because the watch is still switched on. Even with airplane mode enabled it's still a computer after all, so it will be doing things that use power.
     
  8. dcaccount thread starter macrumors regular

    Joined:
    Nov 17, 2013
    #8
    It was about 10 hours
     
  9. exxxviii macrumors 65816

    exxxviii

    Joined:
    May 20, 2015
    #9
    That would be it... 10 hours * 2.5% /hour = ~25%. You saw 32%. Your observation is probably a little high, so maybe you had a runaway app in play. It could be worth a reboot to clean things up.
     
  10. recoil80 macrumors 68020

    Joined:
    Jul 16, 2014
    #10
    You are right, but Siri needs network to work so I'd expect Hey Siri to be automatically disabled when the Watch is in airplane mode.
    Last night I left my Watch unplugged and the battery dropped by about 20%, but Watch wasn't in airplane mode so maybe there was something fetching data in background and 20% in 8 hours is quite normal.
    I tried to leave it in airplane mode unplugged one night and it dropped by about 10%. iPhone loses about 2/3% of its battery power if I leave it in airplane mode during the night so maybe watch does something to consume battery even if network is off
     
  11. Tresbubu macrumors newbie

    Tresbubu

    Joined:
    Oct 4, 2017
    #11
    Hi,
    I own a series 0 apple watch that if put in airplane mode it loses about 10% of charging in the night ... always shutting it off.
    because?
    it's normal?
    from what little I found around looks like you but nobody knows why!
    --- Post Merged, Oct 4, 2017 ---
    ??
     
  12. Ivanovitchk macrumors regular

    Ivanovitchk

    Joined:
    Sep 9, 2010
    Location:
    Paris, FR
    #12
    radios are a huge drain on the AW, especially if BLE is not available and it has to use wifi (or even LTE on S3), even more so if signal is weak, even more so if it has a lot of data to fetch (influenced by the number of apps in dock + number of apps with background app refresh on).

    heart rate monitor every 5min is also quite power hungry, especially if you keep the watch band loose & it takes longer / it needs to activate the green leds (over the less power hungry IR ones) to get a reading.

    involuntary movements could also wake the screen up. I suggest toggling on Cinema / Theater mode at night.

    without airplane mode (but with phone w/ BT on near bed, hence minimal radio drain), with theater mode on & without a very snug fit on a milanese loop, my series 2 38mm loses less than 5% over an 8 hour night on wOS 4.
     
  13. edhchoe macrumors 6502a

    edhchoe

    Joined:
    Oct 28, 2011
    #13
    mine loses only 5% overnight with sleeptracking. So OP's watch is sick.
     
  14. Tresbubu macrumors newbie

    Tresbubu

    Joined:
    Oct 4, 2017
    #14
    What's OP's? My apple watch is sick?


    I called apple support to have an opinion, the battery test was ok!
     
  15. Tresbubu macrumors newbie

    Tresbubu

    Joined:
    Oct 4, 2017
    #15
    Yes, I have watchos 3 otherwise it would not work with 5c,
    many times charging it in the afternoon in the evening with enough charge
     

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