Remove the back cover, check battery is present and fully located into the device, if you are unsure on how to insert the battery properly, then please check the manual. If the battery is present then try charging the device to full power.
It is very important to keep the NObreath® on charge between uses. Lithium batteries have protection circuits built into the battery pack itself (Battery Management System, or BMS), especially those used in medical devices. These protection systems put the battery into a "protection" mode when the voltage falls too low. The reason is that deep discharge permanently damages lithium-ion cells.
If the NObreath® is left to completely discharge, the outcome depends on how long it remains flat:
- Short period (days to a few weeks): In most cases, the device will simply require recharging and should operate normally once sufficient charge has been restored.
- Extended period (months): The internal lithium battery may enter a deep discharge state. This can:
- Permanently reduce battery capacity and run time.
- Prevent the device from charging normally.
- Cause the device not to power on at all.
- Very long storage while discharged: The battery may require replacement by an authorised service centre.
If the device has gone completely flat:
- Connect it to the official charger.
- Leave it connected for at least 4–6 hours (sometimes longer if deeply discharged).
- Attempt to power it on.
If it still will not power up after prolonged charging, the battery has deteriorated beyond normal charging and will likely need recovering or replacement by an authorised service centre.
From a FeNO measurement perspective, a flat battery alone does not affect calibration or measurement accuracy once the device is functioning again, although if the device has been out of use for a long period it would be sensible to perform any recommended QC checks before clinical use.
If you have any of the following issues, then please get in touch with our customer service team:
- Battery contacts blocked
- Device is not charging
- Power button damaged
- Screen issue
If the problem persists or has not been resolved by the information provided above, please contact your local distributor for more advice. Find out who your local distributor is from our website here.