[bug] Endless stream of low battery notifications when taking off ISM

That experience with the infinite low battery notification loop from the Index Sleep Monitor (ISM) app is a known bug often encountered after the wearable device is taken off or disconnected, which triggers repeated battery status checks that fail to clear the notification queue. Since the issue is within the application logic itself, and dismissing the notification or force-closing the app doesn't break the loop, uninstalling the app (as you did) or temporarily disabling all notifications for that specific app in your Android settings are the only effective immediate workarounds.