Introduction: Ajax EN54 Internal Battery 24h — key features at a glance
The Ajax EN54 Internal Battery (ITM006075) is a purpose-built, EN54‑compliant backup battery pack designed for Ajax EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller control units. Offering a nominal 7.4 V and 5 Ah capacity from four 18650 Li‑ion cells, this compact internal battery supplies up to 24 hours of autonomous operation in accordance with EN54‑4 requirements. It is hot‑swappable inside the hub, charges in situ while main power is available, and is protected by a 24‑month manufacturer warranty.
Key features in brief:
- EN54‑4 compliance:Designed to meet fire alarm backup standards.
- 24 hours autonomy:Provides the required one‑day backup for many regulated installations.
- Hot‑swappable:Replace the battery inside the hub without prolonged downtime.
- Compact & lightweight:166 × 87 × 23 mm and ≈270 g, suitable for internal enclosure mounting.
- 24‑month warranty:Manufacturer support for two years.
Detailed specification and benefits
The Ajax EN54 Internal Battery uses a 4 × 18650 Li‑ion cell configuration to deliver a nominal voltage of 7.4 V and a rated capacity of 5 Ah. The pack is engineered to supply an autonomy of up to 24 hours under conditions defined by EN54‑4, with a typical maximum load current of approximately 3.2 A. The recommended end‑of‑life voltage for the pack is around 6.0 V, which protects connected electronics and signals when replacement is due.
Physically the battery is compact and lightweight, measuring 166 × 87 × 23 mm and weighing approximately 270 g. It is intended for indoor use (IP20 protection class) and operates reliably in ambient temperatures from −10 °C to +40 °C with permissible relative humidity up to 75% (non‑condensing).
This battery is specifically built to support EN54‑4 compliant fire alarm solutions, making it suitable for certified control and indicating equipment (CIE). Safety and installation notes include installing or replacing the battery only inside the hub enclosure, using the special removal tool/key for tamper‑protected housings, and following standard lithium‑ion handling and disposal procedures. The manufacturer backs the unit with a 24‑month warranty and publishes a manual/spec sheet for correct installation and regulatory compliance.
- Regulatory peace of mind:Designed around EN54‑4 requirements so installers can meet regulatory backup time targets.
- Reduced maintenance downtime:Hot‑swap capability allows replacement without taking the hub offline for long periods.
- Space and weight savings:Li‑ion cells offer higher energy density than many sealed lead‑acid (SLA) alternatives, saving enclosure space and weight.
- Longer useful life and stable performance:Modern 18650 Li‑ion cells deliver consistent energy delivery with lower self‑discharge versus older chemistries when properly managed.
- Installer convenience:Charging while installed removes the need to precharge external spares; tamper protection keeps the battery secure in public or semi‑public locations.
Use cases and scenarios where this battery excels
The Ajax EN54 Internal Battery is targeted primarily at professional installers, system integrators and facilities managers who need an EN54‑compliant internal backup for Ajax EN54 hubs. Typical scenarios include:
- New installations of EN54‑certified fire alarm systems:When commissioning a fire hub in a commercial building, health care facility or school where EN54‑4 backup durations are required, this battery provides a straightforward, compliant option.
- Retrofit and replacement work:Where an existing Ajax EN54 hub requires a replacement or spare battery to restore required autonomy, the hot‑swappable design simplifies on‑site maintenance.
- Multi‑site managed systems:In properties with many hubs (multi‑tenanted buildings, hotel chains, retail estates), standardized internal batteries simplify stocking spares and reduce service time.
- Environments with restricted access:Tamper‑protected housings and a special removal tool reduce the risk of accidental or unauthorised removal while still allowing service engineers to act quickly when necessary.
- Minimising TCO for critical systems:Compared with bulkier SLA batteries that may require enclosure modifications, the compact Li‑ion pack reduces installation complexity and potentially lowers long‑term maintenance costs.
Comparisons with similar products on the market
When evaluating backup batteries for fire alarm hubs, installers usually consider three broad options: certified EN54 Li‑ion packs (like this Ajax unit), generic third‑party Li‑ion replacement packs, and traditional sealed lead‑acid (SLA) batteries. Key differences:
- EN54‑certified Li‑ion vs SLA:Li‑ion batteries provide higher energy density, lower weight and smaller size than SLA alternatives with similar capacity. They tend to have lower self‑discharge and faster charging characteristics. SLA may still be used in some legacy systems, but Li‑ion generally reduces space and handling challenges. SLA batteries are heavier and bulkier and can require ventilated enclosures for off‑gassing during failure events.
- Certified Li‑ion vs generic Li‑ion packs:A major advantage of the Ajax EN54 Internal Battery is its alignment with EN54‑4 requirements and direct compatibility with Ajax EN54 hubs. Generic third‑party packs may not be EN54‑compliant or fit the hub's tamper and charging interfaces correctly, potentially impacting certification and insurance requirements.
- Hot‑swappable design:Some replacement batteries require powering down the hub or disconnecting wiring to swap packs. The Ajax unit’s hot‑swappable capability reduces downtime and service risk, a decisive benefit in environments where continuous monitoring is essential.
- Cost and value:While certified, purpose‑built packs can come at a higher retail price than off‑the‑shelf cells or generic packs, they offer regulatory compliance, manufacturer support, and fitment assurances that reduce long‑term risk and administrative burden during audits or inspections.
Customer feedback and installer impressions
Although individual user reviews will vary by site and installer, typical feedback from system integrators and service engineers working with EN54 installations highlights several recurring positives:
- Ease of replacement:Installers frequently note that the hot‑swappable design and compact form factor make on‑site battery swaps faster and cleaner than older SLA replacements.
- Confidence in compliance:Buying a battery developed for EN54 hubs reduces the uncertainty associated with matching third‑party batteries to certified fire alarm equipment.
- Reliability in service:Many teams appreciate the consistent run times and charging behaviour when the battery is maintained inside the hub enclosure.
Example installer-style comments (anonymised & representative):
- "Swapping the pack takes minutes and the hub stays online — that saves us significant time on site."
- "We choose the EN54 pack to avoid headaches at audit time — it's certified and fits neatly inside the enclosure."
- "Smaller and lighter than the old SLA units, and we no longer have to make extra room in the cabinet."
Conclusion: Why choose the Ajax EN54 Internal Battery 24h (ITM006075)?
For installers and facilities teams working with Ajax EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller units, the Ajax EN54 Internal Battery offers a convenient, certified solution to meet 24‑hour EN54‑4 backup requirements. Its hot‑swappable design reduces downtime and service costs, while the Li‑ion 4×18650 configuration keeps size and weight to a minimum. The product’s compliance, dedicated fit, tamper protection and manufacturer 24‑month warranty make it a practical choice where regulatory compliance, reliability and maintainability are priorities.
While certified replacement batteries may command a premium over generic options, the reduction in installation risk, assurance of compliance, and simplified maintenance workflow frequently justify the investment — especially in regulated premises such as schools, hospitals, hotels, and commercial buildings. For any project specifying EN54 backup for Ajax EN54 hubs, the ITM006075 is a focused, installer‑friendly option that balances performance, safety and convenience.
