Why does my iPhone's battery drain quickly? How do you deal with this?
Maybe you have some problem with your iPhone? I recommend to go to the service and show your device to the master.
Good day. What exactly model of iPhone do you have? What is the capacity of battery and how old is it? I need more details to say something. Now I can only recommend to buy power bank 20000mah, with this device you will be able to charge your phone in any time you need.