AJAX EN54 internal backup battery (24 hours) white
The internal back-up battery keeps the EN54 Fire Hub or Fire ReX running for 24 hours during a power failure, so that the fire detection system remains available.
The battery is fitted inside the device and is the back-up power supply prescribed by Ajax for the Fire Hub and the Fire ReX in the EN54 range.
Why this back-up battery
24-hour bridging
Keeps the control panel or range extender running during a mains power failure.
Prescribed battery
The correct, compatible battery for the EN54 Fire Hub and Fire ReX.
Internal installation
Fits neatly inside the device, no separate enclosure needed.
Technical specifications
| Function | |
| Type | Internal back-up battery (emergency power) |
| Bridging | Up to 24 hours of autonomous operation |
| Compatible with | EN54 Fire Hub and EN54 Fire ReX |
| Mounting | |
| Placement | Inside the device |
| Note | Does not replace the mains power supply; serves as back-up |
In the box
EN54 internal back-up battery (24 hours)
The battery only.
Documentation
Brief installation instructions.














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