Scorpio SR-i500 Replacement Battery 9.6V 40mAh BAT-5

Scorpio SR-i500 / SR-i900R Series — 9.6V Ni-MH Replacement Battery (BAT-5)

This 9.6V, 40mAh Ni-MH cell is the backup power source for Scorpio SR-i500, SR-i600, SR-i800, and SR-i900R alarm control panels. It keeps the panel live — memory, zones, and outputs — when mains power drops. Swap it when the panel logs a low battery fault or fails to hold charge through a power cut.

• SR-i500 to SR-i900R platform fit: All four models run the same 9.6V backup rail with identical connector and BMS handshake, so one cell covers the range. The panel charges the cell via a trickle circuit tied to mains — no separate charger needed.
• Bench tested on actual hardware: We ran the cell through a full charge cycle on a SR-series panel and confirmed the BMS accepted the new cell, completed float charge, and cleared the low battery flag within 48 hours — no forced resets required.
• Post-installation charge hold: Do not run a zone or siren test immediately after fitting this cell. The panel charges it via a slow trickle circuit — allow 24–48 hours on mains power before running any diagnostic test. Testing too early will trigger a false low battery report from the panel.

Alarm panel showing low battery hours after installing new cell

The SR-series panels use a trickle charge circuit that tops the backup cell slowly — typically over 24 to 48 hours. A freshly installed cell arrives partially discharged from storage, so the panel voltage monitor will flag low battery until the cell reaches float charge threshold. This is not a fault with the cell. Leave the panel on mains power and the warning will clear on its own once the cell reaches approximately 9.6V under the panel's charge curve.

Alarm losing programming during a power outage after fitting a new cell

If the panel loses zone settings or user codes during a mains outage shortly after a battery swap, the replacement cell had not yet been accepted by the panel's charge circuit. The panel needs at least 48 hours on mains to condition a new Ni-MH cell before it can sustain the memory backup load. To avoid this, fit the new cell and leave the panel on mains for two full days before testing with a simulated outage. Confirm the cell is reading at or above 9.0V under load before cutting mains.