Ajax EN54 Internal Battery (24h) Li-ion Backup Battery Black (127877)
Product Features
- EN54 Internal Battery (24h) rechargeable backup battery in black (127877).
- Fits inside EN54 Fire Hub Jeweller or EN54 Fire ReX Jeweller.
- Up to 24 hours of hub operation if the mains supply fails.
- 7.4 V, 5 Ah lithium-ion pack of 4 × 18650 cells.
- Needed with the hub: EN54 Fire Hub Jeweller is supplied without an internal battery.
Ajax EN54 Internal Battery (24h) - Backup Battery for EN54 Fire Hub and Fire ReX
EN54 Internal Battery (24h) is the rechargeable backup battery for the Ajax EN54 wireless fire alarm system. It fits inside EN54 Fire Hub Jeweller or EN54 Fire ReX Jeweller and keeps the device running if the mains supply fails. Ajax supplies the EN54 Fire Hub without a battery, so each hub needs either this pack or the larger EN54 Internal Battery (72h). In the hub, this 5 Ah pack gives up to 24 hours of operation without mains power. It is a 7.4 V lithium-ion pack of four 18650 cells, and Ajax recommends replacing it every 5 years. This listing is the black version.
Also listed as 127877 (black). Ajax model ID IB.5424.Y.
Key features
- Backup power for EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller.
- Up to 24 hours of hub operation without mains power.
- 7.4 V DC, 5 Ah rechargeable lithium-ion pack made from 4 × 18650 cells.
- Maximum load current 3.2 A; end-of-life voltage 6 V DC.
- Fits inside the device housing; the special tool (key) supplied with the hub unlocks the housing for a battery change.
- Recommended replacement interval of 5 years.
- For indoor use, -10 °C to +40 °C, IP20.
Technical specification
| Model numbers | 127877 (black); Ajax model ID IB.5424.Y |
|---|---|
| Type | Rechargeable lithium-ion internal backup battery |
| Cells | 4 × 18650 |
| Nominal voltage | 7.4 V DC |
| Capacity | 5 Ah |
| Maximum load current | 3.2 A |
| End-of-life voltage | 6 V DC |
| Backup time | Up to 24 hours in EN54 Fire Hub Jeweller |
| Compatible devices | EN54 Fire Hub Jeweller, EN54 Fire ReX Jeweller |
| Recommended replacement | Every 5 years |
| Operating environment | -10 °C to +40 °C, humidity up to 75% non-condensing |
| Protection class | IP20, indoor use only |
| Dimensions | 166 × 87 × 23 mm |
| Weight | 270 g |
| Colour | Black (127877); Ajax also makes a white version |
| In the box | EN54 Internal Battery (24h) |
Works with
EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller. For up to 72 hours of backup in the hub, choose the EN54 Internal Battery (72h). Ajax says to use it with compatible devices only.
Common questions
Do I need this with the EN54 Fire Hub?
Yes. Ajax supplies EN54 Fire Hub Jeweller without its internal battery. Fit this pack for up to 24 hours of backup, or the EN54 Internal Battery (72h) for up to 72 hours.
What is the difference between the 24h and 72h batteries?
This 24h pack is 5 Ah from four 18650 cells and weighs 270 g. The 72h pack is 10 Ah from eight cells and weighs 443 g. Both are 7.4 V and 166 × 87 × 23 mm. The standby time the site needs is set by the system design.
How often should it be replaced?
Ajax recommends replacing it every 5 years.
Can it go in an ordinary Ajax hub?
No. Ajax lists it for EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller only, and says to use it with compatible devices.
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, other fire alarm power supplies, or contact us on 01902 902251 for advice.
| Product Code | 127877 |
|---|---|
| Device Type | PSU |
| Manufacturer | AJAX |
| Ajax Range | Baseline |
| Colour | Black |
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