MBP Power Adapter - Interchangeable across MBP/MBA?

GrassHoppa10

macrumors member
Original poster
May 8, 2009
33
0
Always wondered this.

I have a MBP 15" Late 2011, MBP 13" Late 2011, and also MBA 13" 2011.

Can the 85W power adapter from the MBP 15" be used to also power the other 2 machines?

I ask because, my MBP 15" is from work - and when I use it at home several days a week, I have tie-wrapped the 85W adapter onto some existing cables for cleanliness - making the removal of for daily outside use not possible. Meaning I would like to use the same MagSafe power adapter to charge/use all 3 MacBooks when I move from one to another - without whipping out a dedicated power adapter.

No risk of damage due to TOO much power? No risk to battery overcharge due to higher power adapter.
 
Nov 28, 2010
22,684
27
located
It will be okay. I did it myself countless times between 15" and 17" MBP and 13" MB.


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samac92

macrumors 6502a
Feb 18, 2008
537
90
Yep it's fine to use the higher power charger for lower power Macs, but you shouldn't use the lower power chargers on higher power Macs.

The thunderbolt display has an 85W charger for use with all portable Macs
 

kockgunner

macrumors 68000
Sep 24, 2007
1,555
11
Vancouver, Canada
Yep it's fine to use the higher power charger for lower power Macs, but you shouldn't use the lower power chargers on higher power Macs.

The thunderbolt display has an 85W charger for use with all portable Macs
If there a reason for this? I tried it once using an 11" MBA charger with a 15" MBP and besides it taking almost twice as long to charge, nothing went wrong.
 

biohead

macrumors 6502
Jun 18, 2010
428
6
West Drayton, UK
MBP charger (the 85w version) is fine to be used on any MacBook model.

For those wondering about the MBA charger on an MBP:

If you use a 45w charger (MBA) for the MBP, which will pull around 75-80w at full load, you're stressing that charger massively - almost double what it should be.

You'll notice it in two ways:
1: The charger will be extremely hot (although the failsafes should kick in, which turn the charger off when its too hot)
2: Your battery percentage will be decreasing - simply because the charger doesn't provide enough power and so takes the extra from the battery.

The MBA charger will have a much reduced lifespan if it's being used on an MBP. Although it's not as much as an issue on the 13" MBP (which draws around 60w under full load).
 

GrassHoppa10

macrumors member
Original poster
May 8, 2009
33
0
Thanks everyone.

I bought a extra 85W power adapter today, to cover all my travel needs, including office use.

I plan to use it on all my MacBooks.
 
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