Battery is continously draining even after closed

My user told me her watch keep draining fast even after my app JumpJump was closed.

I wonder how to properly close my app.System.exit(1); is it wrong?

Device: Fr158,fr245

I notice it was raised 7 yrs ago, how is it going?

https://forums.garmin.com/developer/connect-iq/f/discussion/872/battery-drain-when-connectiq-app-is-not-running