IPhone 6S Plus – Macbook Pro USB Charging not reaching 2.1A

chargingiphonemacbook prousb

I've seen various reports of iPhone 6 Plus get 2.1A charging from Macbook Pro.




However, I'm unable to replicated that on my own Macbook Pro Retina 15" 2015.

It stays at 1A as below

Current Available (mA): 500
Current Required (mA):  500
Extra Operating Current (mA):   500

Currently on Yosemite and plugged in.

Anyone having the same issue (or has been able to get the Macbook to power out 2.1A?)

Best Answer

I have the same 2015 15" MBP, just upgraded to OS 10.13.4, and with my iPhone 6S+ discharged to 13%, I got:

  • Current Available (mA): 500
  • Current Required (mA): 500
  • Extra Operating Current (mA): 1600
  • Sleep Current (mA): 2100

BUT, I only get that in the right USB port. When I plug it into the left USB port at 13% charge, it Beeps once a second, so I removed it. Once the phone is charged to 20%, it will charge in either port. The phone is now charged to 98%, but the refreshed System Info still shows the same values.