Qolsys IQ Panel 2 Replacement Battery 7.2V 2000mAh Ni-MH

Direct Sensor ds415 / 17-145A — 7.2V Ni-MH Replacement Battery

This 7.2V 2000mAh Ni-MH cell replaces the backup battery in the Direct Sensor ds415 and 17-145A security panel. It maintains alarm, siren, and communication functions when mains power drops. Capacity and voltage match the original factory specification exactly.

• Sensor ds415 and 17-145A compatibility: Both models share the same 7.2V battery rail, connector pinout, and BMS charge profile — a single cell covers either panel without modification.
• Bench tested on actual hardware: We cycled this cell through the panel's float charge circuit and confirmed the BMS accepted the cell cleanly, held the correct charge threshold, and did not trigger a false low-battery fault after the 48-hour conditioning window.
• Post-installation zone testing: Do not run a zone or siren test immediately after swapping this cell. The panel charge controller needs 24–48 hours at float before the BMS reports accurate state-of-charge — triggering a test before that window closes will return a false low-battery warning.

Alarm panel losing programming during a power outage with a new battery fitted

A freshly installed Ni-MH cell starts well below its rated 7.2V and cannot sustain the panel's logic board through a mains dropout until the battery has been conditioned. The panel draws a stabilised voltage of approximately 6.8–7.2V to hold memory and zone configuration — anything below that threshold causes a reset. If a power cut occurs within the first 48 hours of fitting, the battery may drop below that rail before the panel can save state. Install the cell and leave it on mains float charge for a full 48 hours before the backup circuit is relied upon.

Panel still showing low battery 24 hours after a new cell was installed

The Sensor ds415 BMS samples battery voltage periodically and compares it against a stored low-battery threshold — it does not immediately re-evaluate when a new cell is fitted. If the panel flagged a low-battery fault on the old cell, that fault status can persist until the new cell reaches full float charge and the BMS runs its next scheduled check cycle. This typically clears between 24 and 48 hours after installation. If the warning remains past 48 hours, check that the panel is connected to a live mains supply and that the battery connector is fully seated — a partial connection will hold the cell at a false low voltage reading.