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Charge Devices While Sleeping?

A

A4orce84

macrumors 6502
Original poster
Apr 17, 2012
431
46
Hey Guys,

I had my rMBP with the lid closed in sleep mode, and plugged in some bluetooth headphones to charge. To my surprise, it immediately started charging before I even 'woke' up the computer.

I tried googling to see if this was normal or not. Can anyone offer some additional information?


Thanks,
Asif
 
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I'm trying to find some more info on this feature on Google, and not finding much. Is there any 'requirements' (battery level, settings, etc.) to enable this feature and have it working properly?
 
Yes it's normal if the Macbook is sleeping.

Disconnected from power it'll provide 500ma when it's connected to power it'll provide extra depending on device.
 
Is there any information out there that officially details this?

TIA!
 
No, not at all. Just want to learn about the details around it....
 
A4orce84 said:
No, not at all. Just want to learn about the details around it....
Click to expand...
Actually every portable computer, when in sleep mode, can supply power to the USB devices connected to them. As mentioned in the above comments, the required load current is supplied as a charging current to the connected device under sleep mode when Macbook is connected to power. If not connected to the power, then Macbook's battery is drained. I actually charge my phone and my iPad by this very method. I like to keep my phone with me all the time, even when sleeping, and there is no power socket near to where I sleep. So what I do is I keep my Macbook plugged in (and Macbook is in sleep mode. Macbook's charger has a long extension cord- I don't like to keep a power extension cable on my bed), and connect the two devices to my Macbook. I've been doing this for the last 4-5 years. Did that even with my Dell too, but without laptop plugged in. Of course the devices used to drain the Dell's battery in order to charge themselves.
As for the 'details', USBs are always meant to 'supply' power to the device connected to them. Hence if the laptop is on (even in sleep mode), the power is always available on the ports.
 
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I plug in any one of my four iPhones to charge them all the time when the 2015 MBP is closed and sleeping and the phones always charge. I hear the little beep every time I plug them in.
 
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