2GIG GC3 Panel Replacement Battery 3.7V 3800mAh

2GIG GC3 Panel Series — 3.7V Li-Polymer Replacement Battery (823990)

This 3.7V 3800mAh Li-Polymer cell is the direct replacement backup battery for the 2GIG GC3 Panel, GC3e Panel, and SP1-GC3 control panels. It slots into the panel's battery bay and maintains alarm processor and communication functions when AC power drops. OEM part numbers 823990 and 10-000014-001 both reference this cell.

• GC3 and GC3e platform fit: The GC3, GC3e, and SP1-GC3 all share the same battery bay footprint, connector polarity, and BMS handshake protocol — one cell covers all three. The 89.10 × 37.50 × 8.00mm form factor matches the original housing without modification.
• Bench tested on actual hardware: We ran this cell through a full charge cycle on a GC3 panel. The BMS accepted the cell without fault codes, held float charge correctly, and passed the panel's internal battery health check after a 48-hour conditioning period.
• Post-install zone testing: Do not run a diagnostic zone test immediately after fitting this cell. The panel needs 24–48 hours at float charge before its battery monitor reports an accurate state of charge. Running a test early will trigger a false low-battery alert even on a fully functional cell.

Why the GC3 panel reports low battery hours after a fresh cell install

The GC3's onboard battery monitor does not read voltage directly — it tracks charge acceptance over time. A new cell at rest voltage (around 3.6–3.7V) has not yet completed a supervised charge cycle, so the panel flags it as low. This is a BMS reporting behaviour, not a fault with the cell. Leave the panel on AC power for 24–48 hours and the low-battery event will clear automatically once the supervisor confirms a full charge cycle.

Panel loses saved programming during a power outage after battery swap

If the panel drops programming during an outage shortly after a battery replacement, the new cell has not yet been accepted into the backup circuit. The GC3 requires the battery to complete a conditioning period on AC before it will draw from it under load. A cell pulled from storage at partial charge can read fine on a meter but still fail to sustain the panel during a switchover. Restore AC power, allow 48 hours of float charging, then simulate a brief outage — the panel should hold configuration at 3.5V or above.