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Ask Max: PowerBooks and Power Adapters

Asked on 05/26/2006:

Is it OK to use my old 12™ PowerBook power adapter (45 W) with the new 17™ PowerBook (65 W) that I just ordered from PowerMax?


Using that adapter would be bad for your 17™ PowerBook and could create a fire hazard. The reverse of this would be OK to do because a Mac laptop will not use more power than it needs. The Watts (W) of that power adapter is a reference to the maximum power that adapter can provide. Under-powering a PowerBook could cause it not to charge or shorten the life of the battery. In addition to harming the 17™ PowerBook that 45W power adapter will overheat as it tries to give the PowerBook the power it wants. More watts than needed are OK... less is not.

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