Yes! There is an option to improve the life of batteries on older devices. To activate this option, go to your in-game settings and press the Power Saver. Be advised this will lower your frames per second in battle, map and drone. The setting is only recommended if your device is running hot. 

 

We also recommend to not have too many apps open in the background and that you have minimal tabs opened in your phone's browser app as this helps to minimize the battery usage of your phone.