Is it "safe" to use an old MBP charger with a new MBA?

Discussion in 'MacBook Air' started by LordJim, Sep 19, 2011.

  1. LordJim macrumors newbie

    Sep 16, 2011
    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?
  2. strwrsfrk macrumors regular

    Mar 1, 2011
    Arlington, VA, USA
    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!
  3. deeddawg macrumors 604

    Jun 14, 2010
    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.
  4. LordJim thread starter macrumors newbie

    Sep 16, 2011
    Thanks for the responses. I'm glad that's the case.
  5. GGJstudios macrumors Westmere


    May 16, 2008
    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
    This should answer most, if not all, of your battery questions:

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