A. 1. Limit background activity: Go to Settings > Apps > LEGO > Battery and select 'Restrict background activity'. 2. Lower screen brightness: Reduce your device's screen brightness while using the app to save battery. 3. Close other apps: Close any unnecessary apps running in the background to conserve battery life.

B. 4. Use battery saver mode: Enable battery saver mode on your device to extend battery life while using the app.