Ensure uninterrupted fire safety compliance with the Ajax EN54 Internal Battery (24h) — the official rechargeable backup power solution for Ajax's EN54 Line. Engineered exclusively for the EN54 Fire Hub Jeweller (touchscreen CIE) and EN54 Fire ReX Jeweller (range extender), this 7.4 V / 5 Ah Li-ion battery provides up to 24 hours of autonomous runtime when mains power (110–240 V~) fails, meeting stringent EN 54-4 requirements for backup power in fire detection and alarm systems.

Hot-swappable design allows safe replacement without powering down the system or interrupting protection — simply open the enclosure with the included special tool, swap the battery, and resume operation. The battery fits neatly into the dedicated internal compartment, maintaining a clean, professional installation with no external protrusions. Available in white or black to perfectly match the host device's aesthetic, it supports the fully wireless, addressable EN54 ecosystem while delivering critical reliability for offices, warehouses, schools, hospitals, and public buildings.

This battery uses high-quality Li-ion cells (based on 18650 format) for stable performance, long lifespan, and safe operation under demanding conditions. It enables the system to keep monitoring, alarming, and communicating (via Ethernet, Wi-Fi, dual SIM LTE) even during extended blackouts. Pair it with the EN54 Internal Battery (72h) option for sites requiring longer autonomy. As part of Ajax's user-centric EN54 Line, this backup battery combines EN 54 compliance, easy installation, and future-proof reliability — essential for professional fire installers prioritizing safety, compliance, and minimal downtime.