Overview
The Ajax EN54 Internal Battery (72h) is a rechargeable Li‑ion backup pack designed for internal installation in Ajax EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller control units. Specifically engineered to meet EN 54‑4 autonomy requirements, the 72‑hour pack delivers certified backup power for EN54 fire alarm installations.

• EN54 certified usage: Meets EN 54‑4 autonomy requirements when used with compatible EN54 CIE or range‑extender devices.
• Long autonomy: Up to 72 hours autonomous operation (per EN 54‑4).
• Chemistry & capacity: Rechargeable Li‑ion, 8 × 18650 cells, nominal 7.4 V, 10 Ah (10,000 mAh).
• Compact internal design: Low‑profile pack for installation into the battery slot of compatible Ajax EN54 enclosures.
• Indoor use: IP20 protection class; operation −10 °C to +40 °C, up to 75% non‑condensing humidity.

Use cases
Suitable for installers and integrators specifying compliant backup power for EN54 fire alarm installations. Ideal where certified 72‑hour autonomy is required by regulation or site specification.

Safety & installation
Must be installed and maintained in accordance with the Ajax EN54 Internal Battery manual. Use only with compatible Ajax EN54 devices. Follow site wiring, charging and battery disposal regulations. Check local certification requirements (CE / UKCA) and the official manual for installation, charging limits and end‑of‑life procedures.

Warranty
Covered by Ajax standard 24‑month warranty (see manual and reseller terms for details).