The average phone battery gives you about 22 hours of use on a full charge, which is great for staying connected on your commutes, work flights, and at home in the evenings. But that's just the average, actual use time varies by phone model and by what you're using your phone for. For example, the latest iPhone 15 Pro Max boasts a 29-hour battery life. But you'll most certainly get less than that if you habitually scroll through social media or stream video and music.