Maximize uptime and EN 54 compliance with the Ajax EN54 Internal Battery (72h) — the high-capacity rechargeable backup power solution for Ajax's EN54 Line fire safety systems. Tailored for the EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller, this 7.4 V / 10 Ah Li-ion battery (using premium 18650 cells) guarantees up to 72 hours of uninterrupted operation when primary mains power (110–240 V~) is lost, exceeding standard backup requirements for critical fire detection, alarming, and communication functions.

Hot-swappable technology allows safe, tool-assisted replacement without shutting down the system — open the enclosure, swap the battery, and maintain full protection seamlessly. The battery slots directly into the dedicated internal compartment, preserving a compact, professional look with no external additions. Offered in white or black finishes to blend perfectly with the host device, it supports the wireless, addressable EN54 ecosystem while keeping essential features active: multi-channel connectivity (Ethernet, Wi-Fi, dual SIM LTE), visual alarm verification, automation scenarios, and rapid event transmission.

Ideal for extended-risk sites like large warehouses, hospitals, schools, data centers, and public facilities requiring prolonged backup resilience, this battery uses reliable Li-ion technology for stable discharge, long cycle life, and safety. It enables the system to perform at peak during blackouts, with low end-of-life voltage thresholds for dependable alerts. Pair with the EN54 Internal Battery (24h) for flexible options. As a core component of Ajax's innovative EN54 Line, this 72h battery delivers EN 54-4 certified reliability, effortless installation, and peace of mind — essential for installers and end-users focused on superior fire and life safety performance.