Ajax EN54 Internal Battery (72h) for EN54 Fire Hub and Fire ReX Jeweller
Product Features
- EN54 Internal Battery (72h) backup battery in black (127879) or white (127878).
- 7.4 V, 10 Ah rechargeable lithium-ion pack of eight 18650 cells.
- Up to 72 hours in the EN54 Fire Hub Jeweller, or up to 100 hours in the EN54 Fire ReX Jeweller.
- Fits inside the housing: the hub and range extender come without a battery.
- 5-year recommended replacement interval; maximum load current 3.2 A.
Ajax EN54 Internal Battery (72h) - Backup Battery for EN54 Fire Hub and Fire ReX
EN54 Internal Battery (72h) is the larger of the two rechargeable backup batteries Ajax makes for its EN54 fire alarm equipment. It fits inside the EN54 Fire Hub Jeweller or the EN54 Fire ReX Jeweller and keeps the device working if the mains supply fails. It is a 7.4 V, 10 Ah lithium-ion pack made up of eight 18650 cells. Ajax lists up to 72 hours of operation on it for the EN54 Fire Hub Jeweller and up to 100 hours for the EN54 Fire ReX Jeweller. Neither the fire hub nor the range extender includes a battery, so each one needs a battery ordered with it. Choose black or white above to match the device.
Also listed as 127879 (black) and 127878 (white). Ajax model ID IB.5472.Y.
Key features
- 7.4 V, 10 Ah rechargeable lithium-ion battery built from 8 × 18650 cells.
- Up to 72 hours of backup in the EN54 Fire Hub Jeweller, or up to 100 hours in the EN54 Fire ReX Jeweller.
- Fits inside the device housing; the hub and range extender are supplied without a battery.
- Maximum load current 3.2 A.
- Recommended replacement every 5 years.
- Black or white, to match the hub or range extender.
Technical specification
| Model numbers | 127879 (black), 127878 (white); Ajax model ID IB.5472.Y |
|---|---|
| Type | Rechargeable internal backup battery for EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller |
| Cells | 8 × 18650 lithium-ion |
| Nominal voltage | 7.4 V DC |
| Capacity | 10 Ah |
| Maximum load current | 3.2 A |
| End-of-life voltage | 6 V DC |
| Backup time | Up to 72 hours in EN54 Fire Hub Jeweller; up to 100 hours in EN54 Fire ReX Jeweller |
| Replacement interval | 5 years recommended |
| Operating conditions | -10 °C to +40 °C, humidity up to 75% non-condensing; indoor use only |
| Protection class | IP20 |
| Dimensions | 166 × 87 × 23 mm |
| Weight | 443 g |
| Colours | Black (127879), white (127878) |
| In the box | EN54 Internal Battery (72h) |
Works with
EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller. For up to 24 hours of backup in the hub, choose the EN54 Internal Battery (24h). Ajax advises using it only with compatible devices.
Common questions
Which devices does it fit?
The EN54 Fire Hub Jeweller and the EN54 Fire ReX Jeweller. Ajax says to use it only with compatible devices.
What is the difference between the 24h and 72h batteries?
The 72h battery holds 10 Ah from eight cells and weighs 443 g. The 24h version holds 5 Ah from four cells and weighs 270 g. In the EN54 Fire Hub Jeweller, Ajax lists up to 24 hours on the smaller battery and up to 72 hours on this one.
Does the fire hub come with a battery?
No. The EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller are both supplied without one, so order a battery for each.
How often should it be replaced?
Ajax recommends replacing it every 5 years.
Can it be stored or used outside?
It is for indoor use, at -10 °C to +40 °C and humidity up to 75% non-condensing, fitted inside the hub or range extender.
Full manufacturer specification: Ajax EN54 Internal Battery product page
Supplied by Zenith Security Co, Wolverhampton. Orders placed before 2:30pm are normally dispatched for delivery within 1-2 working days to England, Scotland and Wales, or collect from our Wolverhampton trade counter (please call first).
Browse the full Ajax range, more Ajax wireless fire alarms, or contact us on 01902 902251 for advice.
| Product Code | IB.5472.Y |
|---|---|
| Device Type | PSU |
| Manufacturer | AJAX |
| Ajax Range | Baseline |
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