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Old Sep 19, 2011, 10:20 AM   #1
LordJim
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Is it "safe" to use an old MBP charger with a new MBA?

I still have the charger from my old MBP (early 08, pre-unibody) at my desk, making using my new MBA all the more convenient; I don't have to move a charager around if I have one in multiple spots of my house. Is this safe to do? Is it bad for my battery?
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Old Sep 19, 2011, 10:24 AM   #2
strwrsfrk
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Yes, it should be safe

Hi there. I used to have a 2009 17" MBP, so I bought a spare adapter for it. Fast-forward two years, and I still have the spare at my desk for charging my 13" MBA when stationary. The adapter that came with the MBA is now my travel adapter.

Hope this helps!
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Old Sep 19, 2011, 10:28 AM   #3
deeddawg
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Yes, it's fine.

Consider the Apple Cinema Displays (and new Thunderbolt Display) which provide a magsafe charging connector. They're good for all magsafe Macbooks and don't have any caveats AFAIK. It stands to reason then that only only real limitation is not using an under-rated charger i.e. a 45W MBA charger on a MBP requiring a 60W or 85W supply.
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Old Sep 19, 2011, 10:40 AM   #4
LordJim
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Thanks for the responses. I'm glad that's the case.
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Old Sep 19, 2011, 10:41 AM   #5
GGJstudios
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Quote:
Originally Posted by LordJim View Post
I still have the charger from my old MBP (early 08, pre-unibody) at my desk, making using my new MBA all the more convenient; I don't have to move a charager around if I have one in multiple spots of my house. Is this safe to do? Is it bad for my battery?
Yes, it's safe. No, it's not bad for your battery.

From: Intel-Based Apple Portables: Identifying the right power adapter and power cord--US
Quote:
Power adapters for Intel-based Apple portables are available in 45W, 60W, and 85W varieties. Although you should always use the proper wattage adapter for your Apple portable, you can use an adapter of a higher wattage without issue.
This should answer most, if not all, of your battery questions:
Apple Notebook Battery FAQ
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