IPhone 8 Support Fast Charging berapa watt

Apple's new iPhone 8 supports new Qi wireless charging pads as a wireless convenience, but if you're in a hurry to recharge, you'll want to plug it in to take advantage of the significantly faster charge you can get using a standard 10 or 12 watt iPad adapter. New to iPhone 8 is an even quicker "Fast Charging" feature that uses the 29 watt USB-Power Delivery specification associated with USB-C and USB 3.1 to get you from zero to 50 percent in 30 minutes.

Out of the box, Apple continues to ship its latest iPhones with slow, square 5 watt USB chargers that are no faster than Qi wireless charging. The larger USB power adapters that ship with iPads (and sell separately) deliver 10 to 12 watts, and these can be used to safely recharge any iPhone significantly faster.

As with 12.9 inch and 10.5 inch iPad Pro models, the latest iPhone 8 and 8 Plus (and upcoming iPhone X) can make use of Apple's 29 watt USB-C MacBook power adapters (or the 61W or 87W USB-C power adapters that ship with new MacBook Pros) via Apple's USB-C to Lightning cable to charge at 29 watts (14.5 volts at 2 amps).

Note that this (rather expensive, $25) cable is designed specifically to accommodate the USB-PD 29 watt charging standard. Third party USB-C adapters may support USB-PD, but they aren't required to as part of the USB-C or USB 3 specifications. Similarly, third party cables with a USB-C port on one end and Lightning on the other don't necessarily support USB-PD, even if they do work fine for regular USB data sync and basic 10 to 12 watt charging.

Unboxing one of Apple's most luxuriously expensive products (per ounce) : the USB-C to Lightning cable needed for Fast Charging via USB Power Delivery

A post shared by AppleInsider (@appleinsider_official) on Sep 22, 2017 at 4:20pm PDT

Along the same lines, if you use a standard Lightning cable with a USB-C to USB-A adapter, even Apple's 29 watt charger will only support basic (non-PD) 12 watt charging (5.2 volts at 2.4 amps). This is not a conspiracy; the cables involved must all be designed to support the higher power distribution of USB-PD, not simply offer a physical chain of connections.

Also note that it's only the wall chargers that support USB-PD; anything you plug into your USB-C MacBook ports (even with a USB-C Lightning cable) will still charge at the same (non-PD) 10 watts as other modern Mac USB ports (5.2 volts at 2.1 amps).

That's also why you can't recharge a MacBook Pro daisy-chained to another MacBook via a USB-C cable; the new USB-C MacBooks use the same USB-PD specification to charge but can't deliver (or pass through) enough wattage to charge another USB-PD device.

Plugging in your iPhone into an older Mac or PC may deliver USB power even slower at around 2 watts (5v at 0.5 amps), which is the actual specification for USB 2.0. Starting with Macs from around 2011, Apple began providing additional (up to 10 watts) charging power than the spec allowed to devices that can handle it.

Whether you opt for the effortless Qi pad or a fast USB-PD cable, the total cost is going to be somewhere around $30-70, so it boils down to a choice between not having to poke in a cable and not having to wait for hours. It seems like Apple should at least include a 12 watt adapter with its premium priced iPhone 8 models, and should also make it a little easier for users to understand how fast their devices are charging and why (there's no indication in iOS that shows if you have achieved Fast Charging).

On a side note: Qualcomm Quick Charge is an proprietary protocol that is built into the Snapdragon SoCs used in many premium-priced Android phones, and is often cited as an advantage of Android reviews. It claims to support even faster charging than USB-PD, but it does this by modifying Vbus voltage levels and pin assignments of USB ports, creating new incompatibility issues between chargers and cables that "look like USB."

Google itself is strongly recommending its Android licensees against adopting Quick Charge rather than using the same USB-PD standard that Apple has used in its new MacBooks, iPad Pros and now iPhones.

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.

 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.

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.  

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:

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.

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

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.

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.

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 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.

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