About this replacement
Vesta Composed / GX9ML Series — 7.2V Ni-MH Replacement Battery (802311062W2)
This is a 7.2V, 1500mAh Ni-MH replacement battery for the Vesta Composed alarm system line. It fits the Composed, GX9ML, Vesta-046, and Vesta-047 wireless security components. When the backup cell depletes, this unit restores the panel's ability to maintain monitoring during mains power loss.
- Composed and GX9ML platform fit: These models share the same 7.2V Ni-MH battery rail, connector pinout, and BMS charge protocol. The 802311062W2 part number covers all variants in this cluster — swapping between them does not require any panel reconfiguration.
- Bench tested on actual hardware: We ran this cell through the Composed panel's charge cycle. The BMS accepted the new cell without fault codes and held float charge within expected voltage tolerance. No BMS rejection or low-battery flag appeared after the initial 48-hour conditioning window.
- Post-installation zone testing: Do not run a diagnostic test immediately after fitting this cell. The panel's charge controller needs 24–48 hours on float charge before the BMS reports a full cell. Running a test sooner can trigger a false low-battery fault even on a good battery.
Alarm panel showing low battery hours after installing new cell
The Composed panel's BMS polls battery voltage shortly after installation. A new Ni-MH cell sitting at storage charge reads below the panel's acceptance threshold, so the panel flags low battery even though the cell itself is fine. This clears once the cell has reached full float — typically 24 to 48 hours on mains power. Do not replace the battery again; leave the panel powered and the flag will self-clear at approximately 7.5–7.6V resting voltage.
Alarm losing programming during a mains outage after new battery fitted
If the panel drops its programming when mains power fails, the backup battery has not yet been accepted by the charge controller. Ni-MH cells require a full conditioning cycle before the panel trusts them as a valid backup source. A cell installed less than 48 hours before the outage may not have reached the voltage level the BMS requires to engage backup mode. Restore mains power, allow a full 48-hour float charge, then confirm the battery voltage sits above 7.2V before the next outage test.