About this replacement
Bticino Matix Series — 3.6V Ni-MH Replacement Battery (4380NB)
This is a 3.6V, 80mAh Ni-MH cell that replaces the backup battery in the Bticino Matix alarm system control panel. It fits the Matix and Matix A5780N panels, where it holds system programming and supports emergency alerting during mains power failure. Use the OEM part number 4380NB to verify fitment before ordering.
- Matix and Matix A5780N compatibility: Both panels share the same 3.6V backup rail and battery housing. The connector pinout and cell dimensions (20.00 × 16.40 × 15.70mm) are identical across this range, so one cell covers both variants without modification.
- Bench tested on actual hardware: We ran this cell through charge acceptance and BMS handshake checks on the Matix panel. The BMS accepted the cell without fault codes, and float charge behaviour matched OEM spec.
- Float charge conditioning after install: Do not run a zone or siren test immediately after fitting this cell. The Matix panel needs 24–48 hours on mains power to bring the new cell to full float charge. Testing before that window closes will trigger a false low-battery report from the panel.
Alarm panel losing programming during a power outage after fitting a new cell
A freshly installed Ni-MH cell does not hold enough charge to support the panel immediately after fitting. The Matix panel requires the backup battery to reach approximately 3.4–3.6V before it can sustain memory during a mains outage. If a power cut happens within the first 48 hours, the cell may not deliver enough current and programming resets to factory defaults. Allow a full 48-hour conditioning period on mains before cutting power intentionally or testing backup behaviour.
Panel still showing low battery 12 hours after replacing the cell
This is a known behaviour with the Matix BMS — it does not clear the low-battery flag until the replacement cell crosses its internal acceptance threshold, which takes up to 48 hours on continuous float charge. A meter reading low on a brand-new Ni-MH cell at rest is also normal; these cells read around 3.4V uncharged and climb gradually. Leave the panel powered on mains for a full 48-hour cycle. If the warning persists beyond that, check that the cell connector is fully seated and that no pins are bent.