iPhone8/iPhoneX/iPhone XS Max fast charging, what you should know

Since Apple released the iPhone 8, iPhone 8 Plus and iPhoneX that support fast charging in September 2017, USB PD fast charging has become popular, and it has gradually become a well-known charging method. The fast charging technology increase in charging speed is really impressive.

Apple Official website indicate fast charging spec

 

Apple's official spec shows that the iPhone XS, iPhone XS Max and iPhone XR all support fast charging, which allows the phone to charge 50% in 30 minutes. Compared to old 5W chargers, fast charging USB PD charges 3 times as much in 30 minutes.
So far, Apple has released 6 iPhones with fast charging, including the iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max and iPhone XR. But for fast charging of these iPhones, most people haven't aren't fully aware of the full capabilities. So on today's topic, let's talk about the fast charging abilities of the iPhone XS Max and what you should know.

Q1：First and foremost, what charging protocols does iPhone XS Max support?

 We all know that the iPhone 8 and later models can support three charging protocols, namely USB DCP, APPLE 2.4A and USB PD fast charging.
The USB DCP charging protocol is no longer familiar. Take the iPhone XS Max as an example. The default 5W charging charger that comes standard with the phone uses this charging protocol. This is also the cheapest and simplest way to charge iPhone XS Max. Any charger with USB interface on the market can be implemented with a USB-A to Lightning cable. A non-MFi. Certified charging cable can also be used. Of course, the charging speed is also very slow.

Apple original 5W USB charger and USB A to lightning cable

 The APPLE 2.4A charging protocol was first applied to the iPad, and the maximum charging power can reach 5V/2.4A 12W. However, this charging protocol is not the first application on the iPhone XS Max, but from the iPhone 6S and later supports this protocol, the charging power of the mobile phone can not be stabilized at 12W for a long time, and the charging power of each model will also be some differences.

iPhone XS Max with Apple 2.4A charger

Apple 2.4A charging protocol is extensive. Third-party chargers and power banks that support the APPLE 2.4A protocol are available on the market, and only need to be equipped with a USB-A to Lightning cable.  
Apple USB PD charger and USBC to lightning cable
Finally, USB PD fast charging-
At present, the iPhone XS Max uses USB PD fast charging in the same way as before, and end-users need to purchase a USB PD charger and a USB-C to Lightning fast charging cable separately. According to the test results, the iPhone XS Max's PD fast charging power can reach more than 20W, which is greater than the previous generation models.
To sum up: In the case of USB DCP, APPLE 2.4A, and USB PD, the iPhone XS Max's protocol selection strategy is to use the USB PD fast charging protocol first, followed by the APPLE 2.4A protocol, and then finally the USB DCP charging protocol.
How fast is the iPhone XS Max using USB PD fast charging?
For the question of charging speed, it is always necessary to give an accurate answer after actual testing. The iPhone XS Max was tested by Inviolabs with the standard 5W charger and the 30W USB PD fast charge charger. The graph is as follows:

USB PD fast charging speed vs 5W charger

With the USB PD charger for 29 minutes, the phone's power reaches 50%, and it can reach 78% in one hour; it takes only 2 hours and 17 minutes to fully charge. In the case of the standard 5W charger, only 16% of the battery can be charged in half an hour, and the mobile phone can only reach 33% in one hour; it takes 3 hours and 42 minutes to fully charge.

iPhone XS Max charging records by using USB PD fast charging

For the iPhone XS Max, using the USB PD fast charge saves about 90 minutes of charging time compared to the standard charger. But the most important thing is that USB PD fast charging has a more obvious speed advantage when the mobile phone has low battery and needs emergency charging. (The speed is 3 times that of the standard 5W charger within 30 minutes. It is awesome), this is the charm of USB PD fast charging.

Q2: 50% for half an hour, why it takes more than 2 hours to become full?

The charging voltage is at 9V high voltage fast charge in the first 65 minutes, and 5V charging after 65 minutes; the charging current is kept above 1.5A in the first 40 minutes, that is, within 40 minutes before charging,  charging power is basically above 13.5W, it is 2.7 times that of the standard 5W charger, and the power can quickly rise to over 70%.
Why need more than 2 hours to reach 100% power?  We can also check with the curve changes. After the phone is charged for 40 minutes, the charging current drops linearly, and the charging current is almost zero in the next 5 minutes, the iPhone XS Max is in a state of no charging. In the next 30 minutes, the mobile phone is at 5W charging power; furthermore, because the mobile phone's power is saturated, the charging current is gradually reduced, occupying half of the whole charging time, reducing the overall charging speed of the phone.

Q3: Is iPhone XS Max fully supported for USB PD fast charging?

This question is also the most frequently asked. It is easier for everyone to understand that the 9V high-voltage fast charge belongs to the USB PD charging protocol, but there is always doubt about the subsequent charging voltage drop of 5V. 
Although the iPhone XS Max is in a 5V charging state, there is USB PD communication between the mobile phone and the charger, which belongs to the 5V charging mode of the USB PD fast charging protocol. Therefore, for iPhone XS Max, in the case of charging with USB PD, it uses the fast charging USB PD protocol during the entire charge process.

So in order to achieve fast charging, we need a charger that can support fast charging. As mentioned above, iPhone and iPad only support the PD fast charge protocol, but not other protocols such as Qualcomm's QC, so we need to be clear that charging devices need to support the PD protocol.

Q4: Will the fast charging make the battery life shorter?

The Anwer is no. The high temperatures may damage the battery.  For the details: The truths about cell phone battery life: fast charging, overheating

 Inviolabs Full Power Charger

Next, is the consideration of max power out. For the iPhone, according to the test, the 18W charging speed has met daily needs, considering daily portability and compatibility. Inviolabs recommends using an 18W dual port charger. Provide dual PD and QC interface, full compatibility.

 Inviolabs 18W Dual port charger

For iPad or macbook devices, it supports charging power of more than 30W. Inviolabs recommends a 60W dual port charging device. Dual port high power input.

 Inviolabs 60W Dual Port Charger

Finally, we need to choose a cable. What we need here is a USB-C to Lightning cable, which is usually referred to as CtoL. Apple only support the USB-C to Lightning cable for fast charge.  Be aware the this cable has Apple's MFi certification.

Inviolabs DurableLine Plus Cable

Inviolabs offers the following options: DurableLine and DurableLine Plus series. If you using the cables travelling, Inviolabs recommend to use the Plus series. We have prepared a storage bag for you. The nylon braided thread brings better durability. We also recommend you have 2 other DurableLine cables, one in the office another at home.

 

Inviolabs FastCharge Solutions
Want the one-stop solution? Inviolabs now presents the Inviolabs Fast Charging Solutions for you. You can click here for our products and how we make the fast charging for all your devices with One charger.

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https://codeberg.org/neuhalje/bouncy-gpg/issues/1553
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