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Can I use a 65W Power Adapter?
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Senior User
Join Date: Jun 2002
Status:
Offline
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The 85W Mag Safe Power Adapter has gone bad. Apple is in the process of shipping a replacement. In the meantime, can I use the 65W adapter from my daughter's MacBook to charge my MacBook Pro, without screwing anything up?
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17" MacBook Pro 2.66 GHz Intel Core 2 Duo | 320G HD | 8 GB RAM | 10.10.3
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
Status:
Offline
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Yes. It will charge, just slower. The other way around works too. There's nothing you can break.
Nitpick: it's actually 60W for the MB charger.
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Posting Junkie
Join Date: Jan 2006
Location: Colorado
Status:
Offline
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It will charge very slowly (or not at all) when you are using your MacBook Pro, but nothing will go wrong.
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Addicted to MacNN
Join Date: Oct 2001
Location: BFE
Status:
Offline
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You may have to shut down/sleep the notebook to charge the battery. It will likely power it to use without charging if it is on.
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I'm a bird. I am the 1% (of pets).
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Clinically Insane
Join Date: Nov 1999
Location: 888500128, C3, 2nd soft.
Status:
Offline
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In fact, if you're taxing your MacBook Pro, the battery may still discharge even though it's connected to the power supply, but it will discharge a lot slower.
The power supply will get HOT. I've had one shut down on me temporarily, a couple of years ago.
In a pinch, you can do it. I'd sleep it to charge, but that's just me.
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Senior User
Join Date: Jun 2002
Status:
Offline
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Thanks for the replies, the new one is being overnighted but I don't know whether it was shipped today or will be tomorrow. Simon: you're correct - it is a 60W 
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17" MacBook Pro 2.66 GHz Intel Core 2 Duo | 320G HD | 8 GB RAM | 10.10.3
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
Status:
Offline
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An idle MBP draws about 20W. That leaves 40W for charging. Under heavy load you will see that charging becomes extremely slow. But you won't see discharging unless you'd try this with the MBA's 45W adapter. 
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