Most people believe that using a battery case will ruin their phone's battery, but this is not necessarily true. While it is true that cases can add bulk and weight to your phone, they also provide protection against drops and other damage. In addition, many cases come with features that can prolong the life of your battery, such as an extended power supply or a built-in solar panel. So, if you're looking for ways to protect your investment and extend the life of your battery, a case may be a good option for you.