The AC adapter for my old laptop (the laptop is dead, but I still have the adapter) matches the specs of my new AC adapter -- same voltage, same polarity, but the old AC adapter is rated at 6.5 amps, and the new one is rated at 3.42 amps. I think it's safe to continue to use the old adapter. My understanding is that the amperage is the maximum amount of power the adapter can supply, and the new laptop will just draw less than the maximum. Can someone verify this? I'd prefer not to find out experimentally that my understanding is wrong.