The Hailie™ sensor supporting a rechargeable battery should be charged at least every 4 months to ensure continued battery function. Charging time may vary between products, please check the Product Manual of your specific Hailie™ sensor.
The battery status can be checked at any time by pressing the Status Button or Battery Button on the sensor (depending on the sensor type) once.
The battery level will also be indicated when the Hailie™ sensor detects inhaler medication usage - check the colour of the flashing LED to determine the battery level. Go to How do I find out what the battery level is on my Hailie™ sensor? to get more information.