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Swees 25600mAh power bank charging retina Macbook

S

spittingllama

macrumors member
Original poster
Apr 6, 2015
58
0
Hi all.

Have been looking at this powerbank for the Retina MacBook. Anyone know if this will work ok via usb a to usb c?

http://www.amazon.co.uk/gp/aw/d/B00TDGC9WY?vs=1

Thanks
 
K

KPOM

macrumors P6
Oct 23, 2010
18,025
7,868
In theory, any of these power banks should work, but be aware that most of them put out only 10-12W of power, while the MacBook charger puts out 29W, so they will charge the MacBook much more slowly.
 
N

nrubenstein

macrumors 6502
Aug 5, 2008
265
15
Washington, DC
KPOM said:
In theory, any of these power banks should work, but be aware that most of them put out only 10-12W of power, while the MacBook charger puts out 29W, so they will charge the MacBook much more slowly.
Click to expand...

Honestly, in normal usage it's not even noticeable. I'm currently 12 time zones away from home and I didn't even bother bringing anything but my Anker 5-port charger. 12W is plenty for the MacBook. No, it doesn't charge as quickly, but that rarely ever actually matters. I plug it in in the evening, and the battery is full by the morning. (Actually a lot sooner than that.)
 
C

Cvx5832

macrumors regular
Nov 2, 2014
237
88
nrubenstein said:
Honestly, in normal usage it's not even noticeable. I'm currently 12 time zones away from home and I didn't even bother bringing anything but my Anker 5-port charger. 12W is plenty for the MacBook. No, it doesn't charge as quickly, but that rarely ever actually matters. I plug it in in the evening, and the battery is full by the morning. (Actually a lot sooner than that.)
Click to expand...

I will second this. I use a 12w charger when I'm in my garage. I can make it not charge by draining it down to <15% where draw would be at maximum, brightness at max and encoding 4K videos where it gets so hot you see the processor throttling in the Intel Power Gadget.

So it's possible the 12w is not enough, but unrealistic for my use case.
 
tutux

tutux

macrumors member
May 4, 2015
80
8
Just FYI, I have a anker power bank E7 25600mah.

Power delivered to the macbook: 12W

enough to charge/maintain the charge depend of the load of the macbook!
 
mafaky

mafaky

macrumors regular
Jun 12, 2014
159
5
Istanbul, Turkey
Gentlemen, the "power rating" of the source is not the only factor involved in the charging of this 12" rMB.
These external battery banks supply a stabilized voltage of 5.0Vdc (for the moment put their output current capacity aside...). The laptop needs to be charged with 14.5Vdc... Can someone explain as how a 5.0Vdc source can charge a 14.5Vdc load?:confused:
 
X

xPad

macrumors regular
Dec 15, 2013
228
184
mafaky said:
Gentlemen, the "power rating" of the source is not the only factor involved in the charging of this 12" rMB.
These external battery banks supply a stabilized voltage of 5.0Vdc (for the moment put their output current capacity aside...). The laptop needs to be charged with 14.5Vdc... Can someone explain as how a 5.0Vdc source can charge a 14.5Vdc load?:confused:
Click to expand...
5V will work just fine, just slower. This is part of USB 3.1.
 
mafaky

mafaky

macrumors regular
Jun 12, 2014
159
5
Istanbul, Turkey
xPad said:
5V will work just fine, just slower. This is part of USB 3.1.
Click to expand...
I know that USB-C port is not a standard DC port, but are you telling that once you input 5.0Vdc to the USB-C (USB3.1) port, the output is somehow increased to 14.5Vdc? Can you give a more specific link, describing this process???
 
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