Social networking apps such a Facebook have a reputation for constantly trying to send or receive updates and flattening batteries. Also check that email services are set up to only operate when you manually connect to check for emails. If fact, insist your phone does nothing unless you specifically open an app.
Anything that uses GPS will kill the battery very quickly. Quite a few apps do this, obviously the navigation apps, but also social network apps, so your friends know where to find you. Some games also utilise GPS services to supply localised updates and information, like Pokemon Go.