Daitem RXU05X 4.5V Alarm System Replacement Battery 15000mAh

Daitem HAGRXU05X Series — 4.5V Alkaline Replacement Battery (RXU05X)

This is a 4.5V alkaline backup battery rated at 15000mAh, built to the RXU05X specification. It fits the Daitem HAGRXU05X alarm unit along with the RDL464F, D18 SA320AD, and RLC304F panels. When mains power drops, the panel draws from this cell to keep intrusion detection and alert functions running.

• HAGRXU05X and RDL464F platform fit: These panels share the same 4.5V backup rail and use the same physical connector and cell housing. The RXU05X and BATXU05 part numbers both map to this cell — either OEM reference calls out the same specification.
• Bench tested on actual hardware: We ran this cell against the HAGRXU05X charge circuit. The panel accepted the battery without a fault state, float charging began immediately, and the BMS cleared the low-battery flag within the expected 24–48 hour window.
• Post-installation conditioning on Daitem panels: Do not run a zone or siren test straight after swapping this cell. Daitem panels sample backup voltage continuously — if the cell hasn't reached full float charge, the panel will flag a low-battery fault during the test even though the battery is good. Allow 24–48 hours on mains power before triggering any diagnostic test.

Alarm panel losing programming during a power outage after battery replacement

If the panel loses zone settings or user codes when mains power cuts out, the new cell hasn't been accepted into the backup circuit yet. Daitem panels require a conditioning period — typically 48 hours on mains — before the backup battery is fully integrated and capable of sustaining panel memory. Fitting the cell and immediately pulling the mains plug will result in a cold restart and lost programming. Leave the system on mains for at least 48 hours after fitting this battery before any deliberate power interruption.

Panel still showing low battery 24 hours after fitting a new cell

The HAGRXU05X platform reads backup voltage against a threshold — if the cell voltage hasn't climbed to the panel's acceptance point, the fault stays active. A fresh alkaline cell at rest reads around 4.5V, but under the panel's load test it may read lower until the cell stabilises. If the fault persists past 48 hours, check that the cell contacts are clean and seated fully — oxidation on the terminals will cause a measurable voltage drop at the connector. Clean contacts with a dry cloth and confirm the cell reads at least 4.5V with a multimeter before closing the housing.