The app has a feature called Postpone delivery. It gives you 15 minutes extra rental time for free, and the function becomes available if all three conditions below are met:
- You are standing next to a full station
- And have 10 minutes or less left of the included time
- You have not activated extended rental
The Postphone delivery button is displayed on the screen showing how long you've been riding.
The function is available for Android v 2.3.0 or greater, and iPhone v 2.2.1 or greater.
You can read more about the perks of using the app here.