Can someone clear it up for me please? I have a Samsung quick charger I kept from my Note 7. Can I not just plug the 8+ cable into it? Why do I need to buy the USB C to lightning cable?
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Other Fast charging
- Thread starter kat.hayes
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That’s usb c to usb c. It won’t work with lightning ports on Apple products.
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Plus Apple hasn’t added the support for “QC” on the devices. So we get fast charge.
It is difficult to determine how fast it really is, but I agree 50% in 30 minutes is very unimpressive.
Based on my results, if we perform simple linear extrapolation up to 90% on the iPhone 8+ I tested:
0% - charges at 18W (assumption)
70% - charges at ~9V x 1.3A.= 11.7W
90% - charges at ~9V x 1.1A = 10W (projected)
After 90% I am going to assume it drops off to 5V and charges much more slowly.
From the iPhone 8 tear down, we know that the battery is at 3.82V.
From a Verge article, we know that the battery size is 2.675Ah.
We might assume the iPhone 8+ has a capacity of 10.21Wh. 90% of that is 9.2Wh
Based on the linear projection model above, for some time t, using the trapezoid area formula
1/2 x t x (18 + 10) = 14t = 9.2Wh, which would mean t = 0.66h or about 40 minutes.
TLDR; If all that Math theorycraft is right, then the iPhone 8+ under “fast charging” should charge 0-90% in 40 minutes. Let me know if my math is bad.
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Ok how about this, do you know the actual numbers that really matter. How long will the new phones take to fully charge from like 20% to 100% and how long does it take the old phones to do the same. So what are we gaining in a full charge cycle in real time hours/minutes? I know they say 50% in 30 mins. But we know that last 50% isn’t going to take 30 more min since it will be going slower...
Holy smokes in English please..haha so I just asked this above but wanted to know from 20%-100% how long will the IP8+ take in actual minutes, the Numbers that matter to us non math guys. And how is that compared to last year models, like the time it takes the 7+?
even iPhone 7 does 47 percent in 30 minutes with MacBook Pro charger but to 100 percent takes more than 2 hours
2 freaking hours from 0-100%, so what was last years 7+ do you know? So basically we get 50% in 30 min and the next 50% in 1.5 hours.
Crazy right?! Going to retest with a standard 12w charger and compare the results. Pretty underwhelmed
That’s the last 50% in 1.5 hours.
they should name it “faster than last model charge” not fast charge. Lol But I get it, it’s for needing enough juice if u r going out when u only have 30 min to charge it.
I wouldn’t judge Apple too harshly here - pretty sure it’s not safe to charge a battery at high speeds when it is almost full - slowing down the charge at high percentages is a good move on Apple’s part, as it will help to extend the life of the battery.
Well ya I get that, but will it be negotiating like QC3.0 so we don’t lose power and heat that bad boy up? I’m just saying compared to QC3.0 it’s not as good.
Thanks, this is really useful information - it looks pretty disappointing. I assume you used Apple’s official USB-C to lightning cable?
It’s very surprising that after 30 minutes it’s only charged to 43%. That’s quite off from Apple’s marketing of 50%. Apple should definitely clarify on this.
Well I am guessing QC 3.0 also slows down at high percentages. Apple’s fast charging claims appear to be underperforming here though even at the 50% mark which is disappointing.
Indeed. Didn’t Activate airplane mode as I wanted a ‘real world’ test so suppose this explains some of the difference vs Apple’s own testing. That said, this was several hours after turning on the device and had nothing updating in the background etc
Even the OnePlus Dash charge has that behavior to protect the battery, but the overall speed is much better, even outperforming Samsung's fast charging. Their proprietary protocol enables them to deliver those results.
More than fast enough for me. Would work for you if you did while sleeping.
You do sleep don’t you?
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Agreed that plugging is works fine, been doing it for 10 years but I have also had a port go bad so less wear on the lightning connector is good enough reason for me.
No sorry, had planned on doing a 12w test but thought an Airplane mode test with the 29w might be of more interest given Apple’s testing claims. Thought I’d try and get closer to that