According to test results compiled by EveryMac.com, the battery in an Apple MacBook Pro laptop lasts five to six hours even with the Wi-Fi adapter turned on and the processor running full speed. This ...

I recently bought a replacement laptop PC from Dell and was happy to see that its AC/DC power adapter had the same ratings as the ones I had from two now-defunct Dell laptops (19.5 V, 2.3 A/45 W).

My wife has an iPhone 3GS and she's lost the AC charging adapter. I told her I thought all AC adapters for USB devices were equivalent (we have several others lying around the house). She is afraid of ...