PUBG Mobile is planning to make constant efforts to optimize the game so that everyone can play the game in a pleasant environment on various hardward/mobile devices.In order to alleviate the issue of your phone getting overheated or consuming too much batteries, press the ▲ button on the bottom right corner in the lobby, then press "Settings" > "Screen settings". You may select a lower option from the options, such as "smooth", "balance", etc., to lower your phone’s heat and battery consumption rate. Also, you may lower your FPS(frame) settings to lower the heat and battery consumption rate even further. Please note that your battery consumption rate may differ depending on your mobile device and environment.
PUBG MOBILE GAME GUIDE