All users suffer from the draining of the life of their mobile phone's battery during usage. What a frustrating moment when you see your phone is about to die and you don't have access to any power supply. Developers, your device, and the operating system are all involved in taking care of the battery life. Any inefficient way of performing a task in the app may cause an impact on the battery life and needs your intervention to do it in a better way. In this recipe, we will see how to measure the app energy usage from Instruments.