Battery Drain with AutoSleep & Heartwatch

Discussion in 'Apple Watch Apps' started by teralpar, Dec 29, 2017.

  1. teralpar macrumors member

    Feb 20, 2014
    I currently have an Apple Watch 3 LTE (since Sept 2017) and battery life usually lasted over 2 days—I would usually charge the watch overnight, put on the watch around 6am and wear until 8-9pm and still have around 70% left. However, I downloaded the AutoSleep and HeartWatch apps a few days ago, and while I find the apps very useful, the battery life on my watch has taken a big hit. I am now finding myself having to charge it at least twice a day. And once it’s charged, it will usually go from 100% to 50% in less than half a day. Also, I now have to make sure it’s charged before I go to bed. If I fall asleep when the watch is at 100%, after 7-8 hours of sleep its down to 60%. When I first used the AutoSleep app, I would fall asleep at 100% and wake up 7-8 hours later and the watch would still be around 95%. Does anyone else have this battery drain issue with these apps? Do you have any tips as to what I can do to reduce battery drain?

  2. gtjeta macrumors member

    Mar 31, 2012
    I am using both with negligible impact in my battery. I had problems with the battery one day, I do not know why. Reboot and everything was back to normal.
  3. oeagleo macrumors 6502


    Feb 5, 2016
    West Jordan, Utah
    I use both, and have no noticable problems with the battery drain. I charge my watch in the mornings, and usually wind up with 55-60% remaining when I put it on the charger. Might try rebooting your watch as the above poster said.
  4. teralpar thread starter macrumors member

    Feb 20, 2014
    Thanks! I will try rebooting. Although I noticed today that I’ve had my watch on for about 8 hours so far and the battery has gone down from 100 to 69%, so it seems to be back to normal. I don’t know what was going on those other 2-3 days.
  5. TylerDurden130 macrumors regular

    Apr 1, 2009

    Autosleep hasn’t worked for me in a month, I might be the only one though. Liked it for the few weeks it worked. It started to not recognize when I actually woke up and hours after using my phone it finally realized I wasn’t sleeping. So I deleted it.
  6. Kristine macrumors 6502a

    Feb 21, 2005
    Same for me.
  7. canyonblue737 macrumors 65816

    Jan 10, 2005
    Autosleep works perfectly for me, if I start with 100% when going to bed and select theater mode, I always wake up with around 98% battery. Heartwatch uses no battery at all for me, it simply uses Apple Health data when I open the application on the watch or iPhone.
  8. wytwolf macrumors regular

    Apr 23, 2012
    I've started to use theatre mode when going to bed also. The moving about was turning on my screen. I've noticed a 5-10% difference in batter life over night but with theater mode its only 1-2%.
  9. BasicGreatGuy Contributor


    Sep 21, 2012
    In the middle of several books.
    I use AutoSleep, and haven’t experienced any notable battery drain.
  10. Shirasaki macrumors G3


    May 16, 2015
    I use autosleep for the convenience factor (no need to tap anything to indicate “I am sleeping” every night). It relies ONLY on heart rate so I only use it for simple reference. But I don’t notice any battery drain at all. Solid 2 days usage. More than satisfied.
  11. canyonblue737 macrumors 65816

    Jan 10, 2005
    Autosleep uses a lot more than HR to determine sleep periods, but the key thing is it uses data the watch is already recording anyway and then puts it all together AFTER the fact so you don't even need to install the app on your watch if you don't want (just iPhone) let alone run the app at night.

    As far as I know AutoSleep uses...

    1. Heart Rate (lower stable heart rates tend to indicate sleep)
    2. Movement data from BOTH the Apple Watch and iPhone (if you are asleep the iPhone will be still and Apple Watch will show less movement and certain body positions)
    3. On/Off status of iPhone (ie. if you are using your iPhone in bed you must be awake)
    4. Charging status of the iPhone (if you are charging the iPhone at night while your Apple Watch has minimal movement you are likely asleep)
    5. AutoSleep app "Light Off" indication, this is a OPTIONAL button in Autosleep to tell it you are now going to try to fall asleep. In my experience it really doesn't matter if use this.

    AutoSleep is darn smart and super customizable. Don't charge your iPhone at night? Often leave your iPhone ON the bed at night where it can move? You can for example tell the app that so it continues to learn what the likely signs you are asleep are.

    ALL of this requires not the tiniest bit more battery power than if you didn't use the app because it is looking at data the Apple Watch and iPhone collect anyway and all after the fact.
  12. Mikeeee macrumors 6502


    Sep 27, 2017
    48 hours off charger and battery is at 50% using Heartwatch and Autosleep.

    Attached Files:

  13. markol macrumors member

    Oct 17, 2014
    Does the Watch app work if I put the watch to Airplane Mode at night? I don't want to have the wifi/cellular radios on and near my body 24/7.
  14. risenphoenixkai macrumors regular

    Oct 14, 2008
    It should. As someone else said, it's really once everything syncs back to your iPhone that the relevant health/movement data gets sorted out.

    The microwave-band radiation produced by the Watch is non-ionising and extremely low energy, and therefore its interaction with body tissues is virtually nonexistent; the flux passes right through you without interacting with your cells in any way. This flux poses no health risk whatsoever.

    All claims of radiation damage from Wi-Fi and LTE are medical quackery.
  15. cRuNcHiE macrumors 6502a

    Jan 2, 2007
    I use both those apps without issue.

    I seem to regularly get to 3days 14hrs usage before I get the 10% warning ( I don’t use raise to wake) 42mm LTE model, without using LTE.
  16. Guyon macrumors newbie

    Feb 15, 2018
    Does the app have any battery impact on the iPhone tho? is it possible to have it tracking the sleep only via watch data?
  17. borgeindergaard, Feb 16, 2018
    Last edited: Feb 16, 2018

    borgeindergaard macrumors regular


    Sep 13, 2017
    Yes it does. Both AutoSleep and HeartWatch needs Background App Refresh to be enabled, and I consistently see both apps in my Battery stats eating away 1-2% of battery in the background in a 24-hour timeframe. I don't think they use any extra battery life on the watch itself, but they do use up to 4-5% of battery life combined on the phone just running in the background from each charge. This happens no matter if the app is force closed or not.

    I also used AutoWake from the same company, which basically drained my phone overnight unless it was put in a charger... So I've stopped using AutoWake, as it didn't really do anything special.
  18. Lee_Bo macrumors regular


    Mar 26, 2017
    Greenville, SC
    I have both on my watch and use them nightly with no issues. I also turn on airplane and theater modes so notifications and light won't wake either myself or my wife. Works great.
  19. Smartwatchlover macrumors member


    Sep 23, 2017
    Abu Dhabi, UAE
    Yes it does.
    I always set my watch in Airplane Mode when I go to bed and you just need to turn it off when you wake up: after a while (let’s say 1 minute) the auto sleep app on your phone will get all the updates from the watch.

    Easy and painless.
  20. i hate phones macrumors 6502a

    Jul 5, 2010
    Philly Suburbs, PA
    I just started using this app a few days ago... I set my watch to airplane and theater mode when I go to sleep. I still lose about 10% battery overnight. Is this normal?
  21. Suunto macrumors newbie

    Oct 29, 2017
    No, I loose about 5%
  22. YatBob macrumors regular


    Apr 23, 2014
  23. Davidglenn macrumors member


    Dec 3, 2014
    I have been using the app for about 2 weeks. After reading this thread I go to sleep in theatre mode. My phone is DND. I have restarted the watch and iPhone. Deleted and reinstalled the app. Yet I lose about 17% of battery during sleep and about the same for the next 17-18 hours. I have an AW 3 and it is only a few months old so it is not the battery.
  24. i hate phones macrumors 6502a

    Jul 5, 2010
    Philly Suburbs, PA
    I'm still losing at least 10% overnight. airplane,dnd, theater mode. I even turned off the option to turn the screen on by turning the digital crown. tried closing all apps in dock before going to sleep. restarted phone and watch... nothing helps.
  25. Mobster1983 macrumors 6502a

    Sep 8, 2011
    I have an Apple Watch Series 0 (Day 1 purchase) and lose about 7% overnight while using Autosleep. I just charge the watch while getting ready in the morning and it's back to 100%

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28 December 29, 2017