When to reconfigure an audiomoth

Hi -- I am working with volunteers across the state with acoustic recording of bats using AudioMoths. One of the persistent questions they (and I) have regards changing out batteries and the SD card. So, two questions:

1. When batteries are changed out, do the volunteers have to reconfigure the AudioMoth with it hooked up to a computer?

2. When an SD card is switched out, same question, do they need to reconfigure with it hooked up to a computer?

3. While I am here, what is the point of the AudioMoth app (has time)? Does it have a use or not?

Thank you.

Craig Hensley