Apple has revealed that its new 35W Dual USB-C Port Power Adapter, which went on sale late last week, can automatically adjust power depending on the type of device connected.
A new support document explains that when devices are plugged into both USB-C ports on the charger, the (relatively modest) 35W output is split “according to their power requirements.” What that means in practice is that MacBooks, iPhones and iPads take precedence over Apple Watches and AirPods.
For example, if you connect both a MacBook and an iPad, the wattage is divided equally: each device receives no less than 17.5W. But pairing one of these high-priority devices with an Apple Watch or an AirPods case means a 27.5W/7.5W split. Note that the all-important prefix “until” is associated with all of these numbers; your mileage may vary.
Apple adds that the fastest way to charge is to focus on one device. “If either device requires more power, disconnect the other device and the charging cable from your power adapter,” the article explains.
Apple’s dual charger has been rumored since early April and it finally went on sale last week. In addition to the standard charger, there is a compact version that may be more suitable for people who are on the road a lot. Both versions are specified at 35W, and both cost $59. (UK readers will only be offered the larger version, which costs £69 with a UK plug.)