Fast charging . No double ding

Discussion in 'iOS 12' started by Seymour03, Nov 4, 2018.

  1. Seymour03 macrumors newbie

    May 8, 2018
    Sorry for the dumb thread title but ever since updating to Ios 12, when I now plug in for fast charge (using proper usb-c cable,charger etc.) I no longer get a double ding sound to indicate that fast charge is enabled. Anyone else? Why can't Apple simply put a proper indicator on screen?
  2. aakshey macrumors 68000


    Jun 13, 2016
    I never got a double ding either. Not even on iOS 11. Using authentic Apple accessories.
  3. d5aqoëp, Nov 4, 2018
    Last edited: Nov 5, 2018

    d5aqoëp macrumors 6502a


    Feb 9, 2016
    If I use UGreen 30W USB PD charger found on aliexpress app for $15, I do get a double ding. But if I use original Apple’s 30W Charger, I do not get the double ding. However, after measuring the current and voltage with a special USB-C tester device, both the chargers charge my iPhone X at 9V 1.5A (just under 15W). Both the chargers start at 5V 1A and switch to fast charge soon after. But Apple’s charger switches so fast that the charging does not stop for a brief second while is negotiating 9V 1.5A rate. Hence no double beep there.
    9V 1.5A (14-15W) up to 50% and afterwards it switches to 5V 1.5A (7-8W) and after 70-80% its 5V 1A (5W) and last 10% are 5V 0.5A which is painfully slow.

    iPad Pros 10.5” and 12.9” charger at 15V 2A (30W) till 50% after that switch to slow speed.

    I hope this answers everyone’s questions once for all.

    Link to USB-C tester

    UGreen 30W USB-C PD Charger
  4. papbot macrumors 6502

    May 19, 2015
    I now have an XS Max and there is no double ding. The phone it replaced, an 8+, always double dinged in iOS 11. I also have an iPhone 7 that after 12 no longer double dings, it did in 11. I’ve used the same Apple charger on all of them. iOS 12 definitely changed this behavior.
  5. d5aqoëp, Nov 5, 2018
    Last edited: Nov 5, 2018

    d5aqoëp macrumors 6502a


    Feb 9, 2016
    iPhone 7 doesn’t support fast charging. The double ding still happens with UGreen 30W USB-C fast charger.

    If the charger + cable + iPhone cannot negotiate higher current quickly, iPhone dings twice. But with iOS 12 and Apple’s 29W and 30W chargers, the negotiation for higher current is instantaneous and hence no ding.
    It is not affecting charging speed.

    A 30W fast charger will charge an iPhone X (With battery capacity at 100%) fully from 0% to 100% in exactly 120 minutes (2 hrs)
  6. papbot macrumors 6502

    May 19, 2015
    Too many phones I guess. The 8+ definitely did in 11 but not after. I see no difference in charging rates. They all charge quickly.
  7. Peter K. macrumors 6502a

    Peter K.

    Nov 6, 2012
    SoCal / Philly
    Same here, with the Apple 29W power adapter and Apple USB-C to Lightning cable. I don't recall on which version it stopped double dinging (probably iOS 12), but it definitely used to and now it doesn't (iPhone X on iOS 12.1).

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6 November 4, 2018