John Galea's Blog

My blog on Gadgets and the like

iPhone 8 (and presumably X) quick charging

The iPhone 8 still ships with the ubiquitous 5W (5V 1A) charger. This results in an unimpressive charge from dead speed under 2 hours. Pretty much every other current phone has quick charge modes. Well Apple has them too, they just choose to not ship it with the phone so they can extract additional $$s from the consumer. Cause you certainly can’t say their phones are cheap. So let’s have a look at the new quick charge mode on the iPhone and see if it’s worth it … According to an Apple article what you need to experience quick charge are the following:
1) Apple USB-C to Lightning cable ($35CDN) and one of these adapters:
2 Apple 29W, 61W, or 87W USB-C Power Adapter, or a comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD). (The Apple 29W is $59CDN)

So the total price of this is $94CDN + taxes and shipping. Of course you can find other USBC-PD adapters on places like Amazon but be super careful and make sure they can put out at least the 29W Apple recommend or you might not get full speed.

Apple went this way to align with their Mac books, or so the argument could be had. Of course amusing is that the iPhone 8 continues with the lightning cable rather than USB C. For your troubles Apple claims “Your iPhone fast charges up to 50 percent in 30 minutes.

I happen to have an iPad 12W charger, which is capable of 2.4A at 5V using a standard USB to lightning cable, so I thought I’d see what it can do, and compare it to what Apple says the fast charge can do. I saw an Article about this but found it missing details.

Ok lets start with some things I have learned. First of all the charging rate slows down after 80%. This is quite common on most new phones. I also found using the 12W charger that the charge rate draws the most current (as measured by a USB amp meter) between 0 and 50%, exactly the range Apple refer to as their quick charge. A picture goes a long way, here is a graph of the current drawn from the 12W charger Vs the Phone’s battery percent.

Anytime the curve is above the 1A mark you have benefited from being on the 12W charger Vs the standard 5W, which as you can see is a good portion of time.

To look at this another way, here is a graph that shows %of phone charge per min vs the % of the phone is charged. Again you can see a couple things from this, first of all the highest rate of charge occurs when the phone is in the 0-50% range. Second you can see the drop off of the charge rate at around 80%. And lastly you can see the chasm difference between the 2A chargers and the stock iPhone 1A charger. The third charger is an Aukey multi port USB charger which also pumps out 2A.

One more view of the data compares the phone charge Vs time between the Apple 12W Vs the default 5W. As you can see in the graph in 30 mins the difference between the two is around 30% more charge into the phone! (And remembering other 5V 2A chargers will be similar).

And here is a pic of the Aukey I used.

Looking at the data I can see that the Apple 12W or a standard 2A USB charger is pretty much as good as the expensive Apple fast charge option for a whole lot less money! Being able to quick charge a device is as important IMHO as it’s battery life. And this is a HUGE step forward for the platform!

BTW I tried the iPhone 8 with a QC 2 adapter and confirm it does NOT support QC 2. And thus a 9V 2A charger is of no use with the iPhone 8.

December 14, 2017 - Posted by | iPhone Stuff, Uncategorized

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