ADI LYNX Alarm Panel 7.2V Replacement Battery 1500mAh

ADI LYNX Alarm Panel — 7.2V Ni-MH Replacement Battery (WALYNX-RCHB-SC)

This 7.2V, 1500mAh Ni-MH cell replaces the backup battery in the ADI LYNX alarm panel and WALYNX-RCHB-SC control unit. It keeps the panel live during a mains power cut so zones stay armed, communicators stay active, and any triggered alerts can still transmit. Capacity is 1500mAh (10.8Wh) — matched to the original specification.

• LYNX and WALYNX-RCHB-SC compatibility: Both units run the same 7.2V backup rail with identical connector pinout and BMS float-charge logic, so a single cell covers either platform without modification.
• Bench tested on actual hardware: We connected this cell to a LYNX panel under load simulation. The BMS accepted charge immediately, float voltage stabilised within expected range, and no tamper or low-battery fault codes were thrown during the test cycle.
• Post-install charge window: Do not run a zone or siren diagnostic test immediately after fitting this cell. Allow 24 to 48 hours on float charge first. The panel samples battery voltage during self-test, and a partially charged new cell will trigger a false low-battery report even though the cell itself is fine.

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

If the panel drops its zone configuration or user codes the first time mains power fails after a battery swap, the new cell has not yet been accepted into float. Ni-MH cells need a conditioning period on the charger circuit before the panel trusts them as a valid backup source. Until that threshold is reached, the panel may draw from mains only and treat the battery as absent. Leave the panel powered on mains for a full 48 hours before testing backup behaviour — by that point the cell should be sitting at approximately 8.4–8.5V fully charged.

Panel reporting low battery fault within hours of fitting a new cell

This is a timing issue, not a faulty cell. The LYNX panel runs a voltage check shortly after startup, and a freshly installed Ni-MH cell typically reads below the panel's acceptance threshold until it has taken on charge. The fault clears on its own once the cell reaches full float — usually within 24 hours of continuous mains power. If the fault persists past 48 hours, check that the battery connector is fully seated and that the panel lid is closed correctly, as an open tamper loop can generate a separate fault that looks identical on the display.