About this replacement
Somfy TaHoma Pad io — 3.7V Li-Polymer Replacement Battery (1824029)
This 3.7V, 2100mAh lithium-polymer cell replaces the internal battery in Somfy's TaHoma Pad io smart home controller. The TaHoma Pad io acts as the hub for Somfy motorized blinds, roller shades, and awning controllers. When the original cell degrades, the unit loses its ability to maintain schedules and respond to remote commands.
- TaHoma Pad io platform fit: The 1824029 part number covers both the TaHoma Pad io and related Somfy io-homecontrol gateway variants. These units share the same flat Li-Polymer cell form factor, 3.7V nominal rail, and internal BMS handshake — swapping to a mismatched cell triggers a low-voltage lockout before the device boots.
- Bench tested on actual hardware: We cycled this cell through the TaHoma Pad io's BMS verification sequence and confirmed stable voltage delivery across standby draw and active command broadcast states. The BMS accepted the cell without fault codes.
- Post-swap network re-join: After fitting this battery, hold off on triggering any shades or awnings for at least 60 seconds. The TaHoma Pad io runs a full io-homecontrol mesh re-join sequence on every power restoration — sending commands before that completes causes the unit to queue them incorrectly or drop them entirely.
Why the TaHoma Pad io goes offline immediately after a battery swap
The TaHoma Pad io does not resume its prior network state after power loss — it re-negotiates its position in the io-homecontrol mesh from scratch. This process involves broadcasting a discovery packet, waiting for acknowledgment from paired motors, and re-registering with the cloud relay. If the app shows the device offline 90 seconds after the swap, the mesh re-join has stalled rather than completed, and a manual re-pair through the TaHoma app is the next step.
Low battery alert showing immediately after fitting a new cell
Li-Polymer cells lose voltage during storage — a cell sitting in a warehouse at 3.4V will trigger the TaHoma Pad io's low-battery alert, which fires below 3.5V. The device is not faulty and the cell is not defective. Connect the TaHoma Pad io to its USB supply for at least two hours to bring the cell up to its nominal 3.7V operating range. Once above the alert threshold, the warning clears automatically.