Wireless fire alarm systems

Radio fire alarms, or also refer to as wireless fire alarms are becoming more popular as the technology improves.
A Radio fire alarm/Wireless fire alarm should comply with all recommendations BS EN 54-25.
In accordance with BS5839-1, clause 27 All fire alarm radio-linked components should be supplied from at least two independent power supplies. These can be either:
i) the normal mains supply plus a reserve battery (primary or continuously charged secondary); or
ii) a primary battery plus a second primary battery; or
iii) a primary battery plus a secondary battery.
Components, other than fire alarm control and indicating equipment, may utilize batteries to provide the normal power supply;
Wireless fire alarm/Radio fire alarm, that use power supplies incorporating one or more primary batteries should give 30 days warning of impending battery failure". This should be indicated as a low battery warning condition at the control and indicating equipment;
At the point at which the power supply(ies) to any radio-linked component can maintain the component in normal operation for no more than seven days, and, in addition, in the case of fire alarm
devices, 30 min in the alarm condition, a fault warning should be given at the control and indicating equipment;