Glad to know my earlier missives on the topic were confirmed as correct.
CB
On 9/30/11 11:27 AM, Matthew Campbell wrote:
Hi.
Were you reading my mind or something? I've been thinking whether or not I
could use an old MacBook charger with a MacBook air if I was to go about
purchasing one.
Thanks! a! lot! for posting.
On 2011-09-30, at 11:09 AM, Hai Nguyen Ly wrote:
http://www.macobserver.com/tmo/article/it_is_safe_to_use_a_higher_wattage_power_adapter_with_a_lower_wattage_mac/?utm_source=macobserver&utm_medium=rss&utm_campaign=rss_everything
MagSafe Power Adapters Are Safe with All Mac Laptops
After years of speculation, user reports, and conflicting information, we have
discovered official confirmation from Apple that it is safe to use any wattage
MagSafe power adapter with any MagSafe-equipped laptop.
This 65-watt MagSafe Power Adapter can be used on a 45-watt MacBook Air without
issue.
As discussed on Mac Geek Gab 355, while it may be “safe” to do so, it’s worth
noting that it may not always be effective. A higher wattage adapter will
charge a lower-wattage computer just fine (for example, an 85-watt 15-inch
MacBook Pro adapter used on a 45-watt MacBook Air) but a lower wattage adapter
may not charge a higher wattage laptop (a 45-watt MacBook Air adapter connected
to an 85-watt 15-inch MacBook Pro). In the former situation, the computer will
charge, but will not charge any faster than if the stock adapter is used. In
the latter situation, the adapter will not charge the machine at all while in
use, and will only trickle-charge the machine while asleep.
All of this information and more is available in article HT2346 over at Apple’s
Support Page.
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