Somfy Passeo 3.7V Replacement Battery PAR000876000

Somfy Passeo — 3.7V Li-Polymer Replacement Battery (PAR000876000)

This 3.7V, 500mAh lithium-polymer cell replaces the original battery in the Somfy Passeo automated gate and door operator. It restores wireless control and automated open/close functions when the original cell no longer holds a charge. Capacity is sourced directly from Somfy specifications at 500mAh (1.85Wh).

• Passeo gate operator compatibility: The Passeo uses a compact Li-Polymer cell to power its wireless receiver and motor-control logic. Voltage must match exactly at 3.7V nominal — the onboard BMS rejects cells outside its accepted range and the gate will not respond to commands.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Passeo platform. The BMS handshake completed cleanly, the gate accepted open and close commands over RF, and no overcurrent flags triggered during motor-start draw.
• Post-install reconnection on the Passeo: After fitting a new cell, the Passeo performs a network re-join sequence. Allow at least 60 seconds before testing commands — issuing a trigger too early can cause the unit to log a failed transmission and queue a fault state.

Why the Passeo stops responding mid-cycle after a battery swap

The Passeo's wireless module draws a short current spike when it transmits a status update back to the hub. If the replacement cell has a high internal resistance — common in cells that have been stored too long — voltage sags below the BMS cutoff threshold during that spike. The BMS trips, the gate freezes mid-cycle, and the unit logs a power fault. A fresh cell with low internal resistance resolves this; if the issue persists, check that the cell is fully charged to 4.2V before installation.

New battery installed but Passeo still shows low-battery alert in the app

This happens when a replacement cell ships at storage voltage — typically around 3.6V — which sits below the Passeo's alert threshold. The unit reads the resting voltage immediately after power-up and flags it before the cell has settled. Charge the battery fully to 4.2V using the Somfy-supplied cable before fitting it, then power-cycle the Passeo. The app alert should clear within one polling cycle.