However, if you’re stuck in a bind and need to charge your phone from 0% to 100%, you won’t kill your battery doing so now and then. It’s repeatedly practicing this habit that kills your phone’s battery. If you spent a lot of money on a new smartphone, then odds are, you want your phone to last a while. That’s why it’s important to pay attention to how your phone charges so that you can extend your phone’s overall lifespan.