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15" tMBP, power supply can't keep up

cmaier

cmaier

Suspended
Original poster
Jul 25, 2007
25,405
33,473
California
Running handbrake on my 15" tMBP (with the 2.9GHz processor) and noticed that the battery percentage has been slowly dropping (about 1% every couple of minutes). Using the official Apple 87W power brick. Believe the issue is probably that I am using an Aukey usb-c cable instead of Apple's, but not entirely sure.

When I run handbrake with a different 87W brick and Apple's cable (in a different location), haven't noticed this. Could also be an issue with this particular power brick, of course.

I'll try and remember to bring an Apple cable with me tomorrow to narrow the issue down.
 
cmaier said:
Running handbrake on my 15" tMBP (with the 2.9GHz processor) and noticed that the battery percentage has been slowly dropping (about 1% every couple of minutes). Using the official Apple 87W power brick. Believe the issue is probably that I am using an Aukey usb-c cable instead of Apple's, but not entirely sure.

When I run handbrake with a different 87W brick and Apple's cable (in a different location), haven't noticed this. Could also be an issue with this particular power brick, of course.

I'll try and remember to bring an Apple cable with me tomorrow to narrow the issue down.
Click to expand...
It is that cable. Only recent Apple USB-C cables and a few newer ones from other companies are 100W. The rest are 60W at most.

powerocool said:
Can you report how the official Apple cable works?

I've noticed that power also drops when I connect the power through the Apple USB-C AV Multiport adapter while playing games.
http://www.apple.com/shop/product/MJ1K2AM/A/usb-c-digital-av-multiport-adapter
Click to expand...
Yes, those adapters max out at 60W. Apple says this in a support document somewhere.
 
The cable you're using only supports up to 60w. This means the computer is only getting 2/3 of the power it needs.
 
Awjvail said:
The cable you're using only supports up to 60w. This means the computer is only getting 2/3 of the power it needs.
Click to expand...


Too bad, because it's a very nice cable. Already seeing where the official apple cable is going to fray...
 
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