An increasing number of people are complaining that their iPhone X handsets don't last as long as they should, and are experiencing faster battery drain.
Two years ago, Apple surprised the smartphone world with the release of the iPhone X, the first handset to feature a notch, advanced Face ID, and a totally new look. The iPhone X's design was so popular that many handsets released after it copied or at least tried to mimic how Cupertino's smartphone looked like.
http://ibtimes.com/iphone-x-users-experience-faster-battery-drain-issues-2892803/