The Ajax EN54 Internal Battery (24h) is a rechargeable Li‑ion backup module designed to install inside Ajax EN54 Fire Hub Jeweller or EN54 Fire ReX Jeweller enclosures to provide up to 24 hours of autonomous operation in accordance with EN 54‑4 requirements. It charges while installed from the host device and replaces quickly via the dedicated slot/tool.

• Rechargeable Li‑ion pack (4 × 18650 cells), nominal 7.4 V, 5 Ah (5,000 mAh) — designed for EN54‑4 backup operation up to 24 hours.
• Tool‑assisted quick replacement; installs and removes without internal disassembly.
• IP20 rated enclosure for indoor use; operating temperature −10 °C to +40 °C.
• End‑of‑life battery voltage ~6.0 V; manufacturer‑specified maximum load/charge current.
• 24‑month warranty from Ajax.

• Designed specifically for Ajax EN54 Fire Hub Jeweller and EN54 Fire ReX Jeweller devices.
• Compliant with EN 54‑4 backup power requirements for fire detection and alarm systems in Europe.

• Intended for qualified installers; follow the Ajax installation manual. Do not modify or puncture the battery. Observe correct polarity and handling.
• Dispose of used batteries in accordance with local regulations for Li‑ion battery recycling.

Note: supplier cost provided as 35.88 (currency not confirmed). Suggested RRP shown meets a minimum 16% gross margin (price = cost ÷ 0.84 = 42.72 — confirm your store currency and whether you require markup or gross margin if you want an alternative calculation).