I use to suffer from battery life anxiety whenever I needed to use my iPhone heavily, but I’ve overcome that by carrying a small external battery pack with me when I’m out and about. Yes, I know that I could go through all my settings disabling everything, but why carry an iPhone around with me in the first place if it can’t do anything?
If you want a small battery pack that you can pop into your pocket, then the PNY 5200MAH is a great choice at only around 650 rupees. It can be so useful to me as m using it from last 1year