Should I use Unreal for forestry app?

I’m going to make a mobile forestry app that detects user’s GPS coordinates, then pulls alternate data from a database, probably using MySQL. It would only have to ping for coordinates when the user clicks a button. There will be little to no cell phone reception where the app will be used. A friend of mine said I should consider using an event-based program instead of Unreal because using a game engine such as Unreal might drain the battery too fast. Since there won’t be anything graphically intensive going on in the app while it’s running, can I use Unreal for my app or would it likely drain too much battery? A few hours of usage time before battery dies should be sufficient. Thanks!