Hello Arno, welcome to the forum 👋
Velocity Lapse uses Play services for in-app purchasing and crash reporting. The app works entirely offline otherwise. I'd recommend turning on airplane mode when capturing time-lapses.
There are a couple of features that can help to preserve battery:
- You can turn the screen off entirely
OR
- During capture, tap the lock button and the screen will go black (double-tap to show the preview again).