Xfinity iControl Technicolor Replacement Battery 3.7V 2800mAh

Xfinity iControl Technicolor TCA300COM — 3.7V Li-Polymer Replacement Battery

This 3.7V, 2800mAh lithium-polymer cell replaces the internal backup battery in the Xfinity iControl Technicolor wireless security keypad. It fits the TCA300COM control panel used for arming, disarming, and managing home automation commands. Install it when the original cell no longer holds charge after its typical 2–3 year service life.

• TCA300COM panel compatibility: The iControl Technicolor and TCA300COM share the same 3.7V single-cell Li-Polymer architecture. The panel's onboard BMS monitors cell voltage directly — wrong voltage or cell chemistry triggers a permanent fault flag that requires a panel reset to clear.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the TCA300COM platform. The BMS accepted the cell cleanly, reached full float charge without fault codes, and held voltage within the panel's accepted operating window.
• Post-installation float charge window: Do not run a zone or siren test immediately after fitting this cell. The panel requires 24–48 hours on float charge before its internal low-battery threshold resets. Testing too early can trigger a false low-battery alert even on a healthy new cell.

Alarm panel losing programming during a power outage after battery swap

The TCA300COM stores zone configurations and user codes in volatile memory backed by the internal cell. If the new battery hasn't completed its initial conditioning cycle — typically 48 hours on charge — it may not supply enough sustained voltage during a mains outage to hold that memory. The panel then drops to factory defaults when power returns. To prevent this, keep the panel on mains power for a full 48 hours after fitting the new cell before testing backup operation.

Panel reports low battery within hours of fitting a new cell

This is a BMS reporting lag, not a cell fault. The TCA300COM samples cell voltage against a stored threshold — if the new cell arrived partially discharged from storage, the first voltage reading falls below that threshold and the panel logs a low-battery event. Leave the panel connected to mains power for 24–48 hours. Once the cell reaches full float charge (3.7V nominal at rest), the panel clears the flag automatically without any manual reset.