One of the most common problems iPhone users have is with their battery. Batteries can get damaged in a number of ways, most commonly from overheating, water damage, or an occasional drop on the pavement which can break the internal components of an iPhone.
In simple terms, you need your iPhone battery to be working properly so that your iPhone actually stays on as long as you need it to. Lots of companies offer iPhone battery replacement services, so don’t hesitate to get your battery fixed so you can enjoy using your iPhone without having to worry about always keeping it plugging into a charger.