[minimaxir]

For those with battery concerns, turn on Battery Saver in the settings.

With that enabled, when the phone is rotated upside-down (i.e put in your pocket), brightness drops to 0% and 3D rendering is disabled, both of which help. A little. Constant GPS and battery sucking can't be fully mitigated.

[cocotino]

I did that. The screen turned black, and there was no way to bring the game back, other than killing the app. Ridiculous.

[discreditable]

This is a known bug with the app. In power save mode, sometimes the app will stop responding altogether. I had a few instances where I was in power save mode, found a Pokemon and tried to tap it and it would not recognize my actions. I had this happen on Android.

[spike021]

Same, but on iPhone..

[bhtru]

What iPhone do you have?

[cocotino]

5s