My Smart vital is getting discharged within 3-4 days

Smart vital battery life is upto 7 days depending on the usage.
If all functions are enabled it will last for 3-4 days. You can extend the same to 7 days by lowering brightness, switching off notifications, Disable continuous Heart Rate and Temperature Monitoring.
If the issue still persists then please charge the device completely 2-3 hours and repeat the same one more time to check if the battery life is less than 3-4 days.