DeWalt recently released their new Power Stack 5 amp hour battery and many people have been wondering whether it will outlast the XR 5 amp hour battery. Some people have suggested that they should last the same amount of time, but we decided to put that theory to the test by using a DeWalt heat gun to take voltage measurements at the beginning and end of each battery. We also tested their run times to see whether there were any significant differences between the two batteries. Before we begin, it's worth noting that both the Power Stack battery and the XR 5 amp hour battery were brand new and had each undergone three discharges. To start the test, we checked the initial voltage of the Power Stack battery, which started out at 20.57 - not bad. After 16 minutes and 35 seconds, the battery had a resting voltage of 16.35, which started taking a dip at the end. We also noticed that the temperature of the battery was warm to the touch, but not overly hot, with a maximum of 86 degrees. W...