ZTE SRQ-V72M Alarm Panel Compatible Battery 3.8V 3000mAh

ZTE SRQ-V72M Digital Life Controller — 3.8V Li-Polymer Replacement Battery (Li3825T43PH755543)

This is a 3.8V, 3000mAh lithium-polymer backup cell for the ZTE SRQ-V72M and SRQ-V72M Digital Life Controller alarm system panel. It provides power to the panel during mains outages, keeping zones, programming, and siren circuits active. Dimensions are 74.30 × 54.00 × 4.60mm — measure your existing cell before ordering.

• SRQ-V72M and Digital Life Controller fit: Both panel variants share the same battery bay geometry, connector pinout, and 3.8V charge rail. The BMS on each variant communicates charge state identically, so this cell works across both without modification.
• Bench tested on actual hardware: We cycled this cell through the panel's float-charge circuit and monitored BMS handshake. Charge acceptance was normal at 3.8V and the panel cleared its low-battery flag within 36 hours of float charge — no faults triggered after stabilisation.
• Post-installation float charge: Do not run a zone or siren test immediately after swapping this cell. Allow 24–48 hours on mains power so the panel can bring the new cell to full float charge. Running diagnostics before that window causes the panel to report low battery even on a healthy new cell.

Alarm panel losing stored programming during a mains outage after battery replacement

The SRQ-V72M writes zone config and user codes to non-volatile memory, but maintaining that memory during a full mains outage still draws from the backup cell. If the panel drops programming during an outage, the new cell almost certainly hasn't completed its initial conditioning cycle. The panel's charge controller needs 48 hours on mains to fully accept a fresh lithium-polymer cell before it can sustain a real outage load. Until that window closes, the cell voltage can sag under even modest panel draw, causing a brownout that resets volatile system registers. Restore mains, allow 48 hours of uninterrupted float charge, then test by pulling the mains fuse — the panel should hold programming at or above 3.6V under backup load.

Siren not triggering during test after installing a replacement cell

The SRQ-V72M delays siren activation on a newly installed backup cell to allow charge stabilisation — this is a firmware-level protection, not a fault. If a zone test triggers within the first hour of installation, the siren circuit may not fire even though the panel appears armed. Wait at least 60 minutes after installation before running a full siren test. If the siren still fails to sound after that window, check that the battery connector is fully seated — a partially inserted connector reads as present to the BMS but cannot supply the current spike the siren driver demands.