That seems pretty obvious, in that it&#x27;s the app most users spend the most of their time on. I&#x27;m surprised the percentage isn&#x27;t even higher. If a person spends 30 or 40% of their time using their phone in the Facebook app, it&#x27;s clearly going to use a large percentage of the battery life. Not being of bad app coding, but rather battery use is based on how much a user spends using different apps or different features.