Xfinity Home Security Touch Screen Replacement Battery 3.7V 4500mAh

Xfinity Home Security Touch Screen — 3.7V Li-Polymer Replacement Battery (GSP055771)

This is a 3.7V 4500mAh Li-Polymer battery for the Xfinity Home Security Touch Screen control panel. It powers the touchscreen display, arming and disarming functions, and system status monitoring. Install it when the original cell no longer holds charge or fails to keep the panel live during a mains outage.

• Xfinity Home Security Touch Screen fit: The panel draws a steady low current to maintain the display, BMS handshake, and tamper detection logic. This cell matches the 3.7V nominal rail and the flat Li-Polymer form factor the housing requires. Connector orientation and footprint match the OEM GSP055771 spec.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench and monitored the BMS communication with the panel. The protection circuit responded correctly to float charge and did not trigger an early cutoff at rest voltage.
• Post-install charge conditioning: Do not run a zone or siren test immediately after swapping the cell. Allow 24 to 48 hours on mains power so the panel reaches full float charge — otherwise the panel's own battery monitor will flag a low-battery fault even though the new cell is fine.

Alarm panel losing programming during a mains outage with a new battery installed

The panel stores zone configurations and user codes in memory that needs continuous backup voltage to survive a power cut. A freshly installed Li-Polymer cell may sit at 3.5V or below straight out of the packaging. If mains drops before the cell has charged above 3.6V, the panel voltage rail can fall short of the memory retention threshold. Allow at least 48 hours on mains after installation before treating the backup as fully conditioned — after that window, the cell should hold above 3.65V and keep the panel's memory stable through a typical outage.

Panel showing "Low Battery" fault within hours of installing a new cell

This is almost always a conditioning issue, not a faulty cell. The Xfinity panel's battery monitor reads the cell voltage directly and trips the low-battery alert below a set threshold — typically around 3.5V. A new Li-Polymer cell ships partially discharged, often in the 3.4V to 3.5V range. Leave the panel on mains power for 24 to 48 hours and the charger circuit will bring the cell up to its float voltage of roughly 3.7V, at which point the low-battery fault clears on its own.