Ajax EN54 Internal Battery 72h – Rechargeable emergency power battery for fire alarm systems

The Ajax EN54 Internal Battery 72h is a rechargeable Li-ion backup battery specifically designed for use in the EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller. It provides an autonomous power supply of up to 72 hours, ensuring that Ajax fire alarm systems continue to operate reliably and in compliance with standards, even during a power outage.

Standard-compliant safety in the event of a power outage

The battery meets the requirements of EN 54-4 and ensures an uninterrupted power supply in safety-critical situations. This makes it a key component for compliant fire protection in commercial and municipal buildings where maximum operational reliability is required.

High-performance and long-lasting battery technology

The EN54 Internal Battery 72h is based on 18650 type Li-ion cells with a nominal voltage of 7.4 V and a capacity of 10 Ah. This combination enables a long operating time while maintaining a compact design. The battery's color is matched to the fire alarm control panel and the wireless signal repeater, ensuring a harmonious visual integration into the system.

Hot-swappable for uninterrupted operation

A key advantage is the hot-swap capability. The battery can be replaced while the system is running, without shutting down the fire alarm. This ensures all functions remain active, allowing maintenance to be carried out quickly and safely.

Quick installation and easy replacement

The battery is installed directly in the designated slot of the EN54 Fire Hub Jeweller or EN54 Fire ReX Jeweller. All mounting hardware is already integrated, so the battery simply needs to be inserted and clicked into place. Replacement is also straightforward, without having to disassemble the device housing. The battery can be removed and replaced immediately using the included key.

Optimized for professional EN54 systems

As an original accessory from Ajax Systems, the EN54 Internal Battery 72h is optimally designed for the Ajax EN54 ecosystem. It helps installers and operators achieve maximum reliability, easy maintenance, and full compliance with standards in a professional fire alarm system.

Battery type

• Battery: 8 × 18650

Rechargeable Li-ion battery.

• Nominal voltage: 7.4 V
• Capacity: 10 Ah

power supply

• Maximum load current: 3.2 A
• Battery voltage at the end of the runtime: 6 V

electricity consumption

• Average power consumption with LTE only: 50 mAh
• Average power consumption with Ethernet only: 120 mAh
• Average power consumption using Wi-Fi only: 70 mAh
• Average power consumption with Ethernet and mobile network (standby): 102 mAh
• Average power consumption with LTE, WLAN and Ethernet: 140 mAh

--- Recommendations ---

Only use the battery with compatible devices.

The battery is intended for indoor use only.

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Housing

• Dimensions: 166 × 87 × 23 mm
• Weight: 443 g
• Operating temperature: from -10 °C to +40 °C
• Operating humidity: up to 75% non-condensing
• Protection rating: IP20
• Color: Black, White