Abus HSRM20000 Manuel Utilisateur page 35

Even so, the wireless smoke detector remains functional in this condition.
You must test the wireless smoke detector each time you change the battery.
Carry out the test as detailed above to check if the functioning and the network
connection can still be guaranteed.
Note
To ensure a long service life and reliable operation, we recommend using the
following high-quality lithium batteries:
Lithium: EVE CR9V-P
The lifetime of the battery can be negatively affected by frequent alarms, dirt,
large variations in the temperature or similar environmental influences.
After changing the battery, the low battery warning may continue for a further
10 minutes, due to the nature of the network. Check the functionality after testing
the battery.
Alarms and error signals
When the alarm threshold is exceeded, a loud alarm sounds.
The alarm continues sounding as long as there is smoke in the detection chamber.
The alarm is only switched off when there is no more smoke in the detection
chamber.
Note
Your device requires no maintenance.
Protect the device from dust, dirt and moisture.
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