iPhone X Charging Speeds Compared: The Fastest and Easiest Ways to Charge Your iPhone

Discussion in 'MacRumors.com News Discussion' started by MacRumors, Dec 5, 2017.

  1. timdavid macrumors newbie

    Dec 15, 2017
    I was told by an Apple representative that the down side of fast charging an iPhone (8 or X) is that this significantly reduces the battery life, and is worth avoiding if that is a consideration. Can you provide any data on the extent to which fast charging damages the battery life. I gather that using one of the higher wattage adaptors can have the same effect, even on ordinary iPhones.
  2. Black Tiger macrumors 6502

    Jul 2, 2007
    Simplicity is not worrying that a charging method will work.
    I suppose. I’ve never done anything but charge over night. I suspect most customers do the same and in this scenario a fast charger isn’t really necessary.
    Pretty interesting marketing there isn’t it? I don’t see the point of the pads to be honest. You can’t really use the phone when it’s chargin in this method. And since a cable plugs into the pad anyway, you’re tethered the same as a cable plugged into the phone. Maybe to use the lightning port for headphones while charging? But again it seems like a rare scenario. I’d rather spend the money on a fast charger than a pad. Makes more sense to me.
  3. The Game 161 macrumors P6

    The Game 161

    Dec 15, 2010
    With how easy it will be now to get your battery replaced I don’t think this matters much

    I think this will only decrease battery life if you keep your device longer than 3 years or more.
  4. telepati macrumors regular


    Jan 20, 2009
    This is my result for iPhone 8;


    iPhone 8 64GB
    Dodocool 45W Adapter
    Apple 2m USB-C Cable

    The phone was fully blackout, not even %1 charge has it.

    - 70m - %91
    - 1h 47m - %100
  5. nroose macrumors newbie

    Sep 13, 2005
    I have not looked through all of the pages of these comments, but did anyone comment on or do testing with a new Macbook that has USB-C ports and a USB-C to lightning cable?
  6. Joshanth macrumors newbie

    Feb 14, 2017
  7. RamGuy macrumors 6502a


    Jun 7, 2011
    It might seem like USB-C PD / Fast Charging is indeed putting some additional strain on the battery. I didn't have Battery Health reporting in iOS when using my iPhone 7 Plus, 6S Plus and 6 Plus but I used app "Battery Life" and it seems to be reporting pretty much the same as the built-in Battery Health tool in iOS.

    I've had my iPhone X for about 6 moths now. And according to Battery Life and Battery Health in iOS I'm already down to 96%. Compared to my iPhone 6 Plus, iPhone 6S Plus and iPhone 7 Plus they did not drop below 100% and I switch phone's every year, or actually the iPhone 7 Plus got a few additional months of use due to iPhone X releasing later in the year.

    The only real difference in my charging and usage habits is that I use Apple's USB-C 29W charger 99% of the time, as compared to before when I almost always used the Apple 12W charger. It's the same with my wife's phone, she have moved from iPhone 6 to iPhone 6S to iPhone 7 and is now using the iPhone X and her phone's never dropped below 99% and her iPhone X, also about 6 months old is already down to 94% and again the only main difference is us having Apple USB-C 29W chargers through-out our apartment instead of Apple's 12W chargers as we had before.

    We also notice that the battery/phone gets much warmer when using the Apple USB-C chargers compared to the Apple 12W charger. And a few times charging just bugged out at around 50% with the phone becoming really warm but without the battery percent getting any higher for like 30 minutes+ until we decided to disconnect the phone, reboot it and plug it back in.

    We are eagerly awaiting Apple's AirPower wireless charger. It will charge much slower, but we love the idea of having a single charger that can charge our iPhone, Apple Watch and AirPods all at the same time. But I doubt wireless charging will put less strain on the battery as my experience with wireless charging on Android phone's is that the phone's get even warmer compared to fast-charging. Take the Galaxy S8 for instance, its get rather warm when using fast-charging, but it gets even warmer when using Samsung's wireless charger.
  8. timdavid macrumors newbie

    Dec 15, 2017
    --- Post Merged, May 12, 2018 ---
    My understanding (from discussion with Apple) is that the thing that shortens the battery life is the use of devices that deliver fast charging, which means that wireless charging system that do not deliver much power should be safe (though slow). The reluctance of Apple to publish data on the adverse effects of fast charging is concerning and suggests this is a potential problem, though if fast charging is a real priority then the need for that may take precedence on the desire for long battery life. I do not know of any evidence that heat or the temperature of the device can be used as a proxy to estimate the speed of charging.
  9. Keirasplace macrumors 601

    Aug 6, 2014
    Anything that increases current density, especially near 20% and 100% and heat will damage the battery.
    So, in doing fast charging, you ARE exchanging convenience for battery longevity.
    That's the case no matter who does it, Apple, Samsung, etc.
  10. alanmcdonley macrumors newbie


    Feb 18, 2010
    Boynton Beach, FL
    Thank you for this analysis. I have a 7 year old iPhone 4S which has always been charged at the lowest rate and still gets 70% of the original capacity. My just retired iPhone 5 had two swollen batteries; Each lasted a little over 2 years and were at 65-70% capacity, after charging at 2.1A (10W).

    I recently read that Apple expects the iPhone X battery to have 80% capacity at 2 years using the provided low rate charger. Hopefully the 10-12W rate will not change this forecast considerably.

    My other concern is minimizing the "exploding battery" risk. It is uncertain if trends for higher capacities and higher charge rates will not also increase this risk.
  11. Swampthing macrumors 6502a


    Mar 5, 2004
    I've spoken to several Apple employees about this, and they DO believe using the 12W charger for your iPhone adversely affects the overall lifespan of the battery. That's the reason why it's not the one included when you buy a new iPhone.

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