The touch App doesn’t work when I shut it down manually. I was told that it makes the battery last longer.

If the touch App is manually shut down in your smart device, it is no longer running and can’t process the touch io credential validation that is triggered when the reader is tapped or a hand is brought into close proximity. It’s a misconception that shutting down apps increases battery life. The touch App utilizes very little battery on the device; the app should be left running at all times.