We have introduced to you before that the iPhone can be quickly charged directly using the power adapter of the MacBook notebook, but does the Mac support charging the iPhone directly? How much power does it use when charging? We read this article with questions to find out.
Can I use MacBook to charge iPhone directly?
According to the official introduction of Thunderbolt 3, the maximum charger for charging a computer is 100W, and the theoretical maximum value for a computer to charge an iPhone is 15W.
First use the ones before 2016 Mac (USB 3.0, USB to Lightning cable) charges an iPhone that does not support fast charging. It can be seen that the actual charging speed is consistent with the charging speed of the iPhone's standard 5V/1A power adapter.
Using the same computer (USB 3.0 USB-C to Lightning cable) to charge the iPhone that supports fast charging, you can find that the charging current can reach 2100 mA, which is close to the power of the iPad power adapter when charging the iPhone. .
But it should be noted that when the Mac is running large programs or rendering and decoding 4K videos, the body temperature will increase and the power will decrease. It’s difficult to reach full load power to charge an iPhone.
Next, when we use the updated MacBook 2018 to connect USB-C to Lightning to charge the iPhone X (supports fast charging), we can find that the charging power has basically reached the charging power of the iPad charger;
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When using a USB-C to Lightning cable to charge the iPhone 7 Plus (which does not support fast charging), I found that the charging power was very low, even slower than that of older computers.
We tried to use the docking station to connect the USB to Lightning data cable to conduct a charging test for an iPhone that does not support fast charging. Since the docking station only supports USB 2.0, the power supply is very low and the charging speed is extremely slow.
Use the docking station to connect the USB to Lightning data cable to support fastI conducted a charging test on a charged iPhone and found that the charging current was only 0.1 A higher, which is almost meaningless.
Final conclusion:
Devices that support fast charging, such as iPhone 8 and newer models, charge faster than devices that do not support fast charging;
When charging , try to avoid using the HUB docking station to charge the device, and directly use Thunderbolt 3 to connect the USB-C to Lightning data cable to charge the device faster;
When the Mac is connected to the mobile phone for charging, even if it can reach the maximum power of the MacBook ( 15W), the charging speed is also far slower than using a Mac charger to charge the iPhone directly.