The new 2016 MacBook Pros will have 4 USB-C connectors, and every connector can operate as charging your macbook. But what happens if you have 2 USB-C power adapters, and plug one in a connector and the other in a different connector on the same laptop?
The Chromebook Pixel already has two USB-C connectors, anyone tried it there? Or any other laptop?
I'm just curious!
MacBook Pro with Retina display, macOS Sierra (10.12.1)
Just did it, apparently nothing. The computer did not give the audible beep that I connected a power cable after plugging in the second one, but the power indicator did flash. The time until completely charged did not change.
So I would surmise the computer recognized that a second power adapter was available, but chose to NOT request full charging power from the second one.
If your charge has not yet completed, an interesting experiment would be to remove the first charger, and see if the charging time changes (i.e., does it switch over to the second charger when the first one disappears?)
The older MagSafe adapter has a micro controller in it and uses a specific protocol before it can enable full-power changing.
The MagSafe adapter supplies a small nominal power and its identifier of charger-type and serial number. The MacBook checks what kind of adapter it is and if acceptable, gives the adapter the go-ahead to send full charging power. There is a tangible delay (appears to be about 1 full second) before this happens. If all is going well, the computer then tells the power adapter to light the orange LED.
I expect a similar protocol will be used for the new USB-C power adapters.
Would the protocol allow for two adapters? That would be awesome for fastcharging.
Or would the protocol not even check if there was already an adapter so it will accept the second one?
Should we try three? 😁 (sorry, I could not resist)
Ciao.
Hi,
It has already been tested. A second power adapter does nothing, it is "ignored."
What happens if you plug in two power adapters
