Pyronix BATT-ES1 3V Alarm Sensor Replacement Battery 3600mAh

Pyronix XDH10TT1-WE & DELTABB-WE Series — 3V Li-MnO2 Replacement Battery (BATT-ES1)

This is a 3V, 3600mAh Li-MnO2 cell replacing the factory battery in Pyronix wireless alarm peripherals. It fits the XDH10TT1-WE door/window contact sensor, the Deltabell DELTABB-WE siren, and the Enforcer LEDRKP-1WE wireless keypad. The flat pouch format and OEM part reference BATT-ES1 (also cross-referenced as CP405050-2P) confirm fitment across the listed devices.

• Multi-peripheral compatibility: The XDH10TT1-WE contact, DELTABB-WE siren, and LEDRKP-1WE keypad all share the same 3V Li-MnO2 cell format and connector footprint. Pyronix standardised this cell across the product range to simplify stock management in multi-zone installations.
• Bench tested on actual hardware: We ran this cell on the XDH10TT1-WE sensor and confirmed the wireless transmission handshake with the Enforcer panel. Open-circuit voltage on arrival measured 3.15–3.20V. The panel cleared the low-battery fault within 24 hours of installation without manual override.
• Wireless sensor RF interval: After fitting, leave the zone armed and undisturbed for one full supervision cycle before running a walk-test. Triggering the sensor immediately after installation can interrupt the first RF check-in and cause the panel to log a communication fault rather than confirm the new cell.

Why the Enforcer panel flags low battery hours after a fresh cell is installed

Li-MnO2 cells have a narrow voltage window, and the Enforcer panel samples battery voltage against a stored threshold during the first supervision poll after wake-up. If the sensor transmits its first check-in before the cell has stabilised from the brief load spike of initial activation, the reported voltage can sit just below the panel's threshold. This typically clears on its own within 12–24 hours as the cell voltage settles. If the fault persists past 48 hours, reseat the cell, ensure the cover is fully latched, and verify open-circuit voltage reads at least 3.0V with a multimeter before reinstalling.

Panel showing tamper fault immediately after battery swap

A tamper fault appearing right after a cell swap almost always means the sensor housing lid has not clicked fully closed. The XDH10TT1-WE uses a mechanical tamper spring that stays depressed only when the cover is fully seated — even a 1mm gap trips it. Remove the device from the mounting, press the cover until you hear the click, then re-fix to the surface. If the tamper fault clears but returns when the device is screwed down, the back-plate is slightly bowed; loosen the fixing screws by a half-turn and re-test.