Battery get confused on low temp'?

Discussion in 'iOS 9' started by MacSafe, Jan 9, 2016.

  1. MacSafe macrumors regular

    Joined:
    Jun 8, 2015
    #1
    Hi
    Today I run with my year old iPhone 6.
    I started my run, using Nike + running app, with about 34% of battery.
    After 29 min approximately, the device shut down itself. I have tried to turn it on but it showed the "no power" logo.
    What may cause this issue?
    (It was about 13° (c) outside)
    Thanks.
     
  2. C DM macrumors Westmere

    Joined:
    Oct 17, 2011
    #2
    Quite low or high temperatures can certainly have effects on batteries. That said, 13 C isn't really all that low.
     
  3. ANDJOE macrumors member

    ANDJOE

    Joined:
    Aug 3, 2010
    #3
    I've experienced this as well in the cold. It seems to be worse using beta builds. I am forced to walk around with the battery in the event it shuts down.
     
  4. Vexxx macrumors member

    Joined:
    Oct 19, 2014
    #4
    Took a walk in -25 C this week. Everything ok after half an hour. Screen was a bit slow.

    However, some have reported problems in this weather, with both new and old models so it seems to be hit or miss.
     
  5. ZEEN0j macrumors 6502a

    Joined:
    Sep 29, 2014
    #5
    Same here about the screen. Kind of looks like motion blur or ghosting. No battery problems though.
     
  6. Mlrollin91 macrumors G4

    Mlrollin91

    Joined:
    Nov 20, 2008
    Location:
    Ventura County
    #6
    Its not the temperature, but the battery/device itself. If you don't regularly restart your device, the battery meter gets confused. I've turned off my iPhone when the meter said it was 85% and turned it back on it and it was at 59%. Or the opposite has happened, I've turned it off at 70% and when I turned it back on the meter read 77%.

    Always remember, the % meter is an 'estimate' of the current remaining battery. It is not near perfect. Ever noticed that your device stays at 100% longer than any other %? If you track the mAh of your device, you would notice that it doesn't drop from 100% until the battery is really at 95%. So it stays at 100% for much longer than it should.
     
  7. Max(IT) Suspended

    Max(IT)

    Joined:
    Dec 8, 2009
    Location:
    Italy
    #7
    I'm running with outside temperatures below 0°C without any issue , so it's not temperature related.
    A battery shutting itself off at 20-25% could be defective ....

    A lot of people had a similar problem with iPhone 5, people was pointing at iOS as a bug, but after a few months Apple started a recall program for iPhone 5.
     
  8. Jetcat3 macrumors 6502

    Joined:
    May 3, 2015
    #8
    Taken from battery university.

    Like humans, batteries function best at room temperature. Warming a dying battery in a mobile phone or flashlight in our jeans might provide additional runtime due to improved electrochemical reaction. This is likely also the reason why manufacturers prefer to specify batteries at a toasty 27°C (80°F). While operating a battery at elevated temperatures will improve performance momentarily, prolonged exposure will shorten life.

    As all drivers in cold countries know, a warm battery cranks the car engine better than a cold one. Cold temperature increases the internal resistance and lowers the capacity. A battery that provides 100 percent capacity at 27°C (80°F) will typically deliver only 50 percent at –18°C (0°F). The momentary capacity decrease differs with battery chemistry.

    The performance of all batteries drops drastically at low temperatures; however the elevated internal resistance will cause some warming effect. At –20°C (–4°F) most batteries stop functioning. Although NiCd can go down to –40°C (-40°F), the permissible discharge is only 0.2C (5-hour rate), Specialty Li-ion can operate to a temperature of –40°C, but only at a reduced discharge rate; charging at this temperature is out of question. With lead acid there is the danger of the electrolyte freezing, which can crack the enclosure. Lead acid freezes more easily with a low charge when the specific gravity of the electrolyte is more like water than when fully charged.
     

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