I wasn't sure where to put this topic, but since battery life is related I thought I would put it in one of the laptop forums. What apps are available to test for a failing battery and hard drive? If I were to buy a used Macbook Pro or Air - old or new model, I want to check these and make sure I am not getting a dud. For example on the hard drive... On Windows I use a fantastic program that is FREE, called CrystaldiskInfo. It checks the SMART attributes and will warn you if a hard drive is failing. What free programs are available on Mac?