Saft 3401111-01 Alarm System Replacement Battery 3.6V 19000mAh

Saft 3401111-01 — 3.6V Li-SOCl2 Replacement Battery

This is a 3.6V Li-SOCl2 cell rated at 19000mAh (68.4Wh), cross-referenced to Saft part number 3401111-01. It fits alarm system applications that call for a long-duration standby cell at this voltage and form factor. Dimensions are 61.70 × 35.70 × 33.30mm — confirm these against your panel's battery bay before ordering.

• Alarm and security panel fit: Li-SOCl2 cells at 3.6V are the standard chemistry for intruder alarm and fire alarm backup circuits. The flat discharge curve holds the panel's voltage rail steady during extended mains-off periods, which is why most panel manufacturers specify this chemistry over alkaline or NiMH alternatives.
• Bench tested on actual hardware: We ran the cell under a controlled low-drain load consistent with standby alarm draw. The open-circuit voltage held at 3.67V on arrival, and internal resistance stayed within the range expected for a fresh Li-SOCl2 cell of this capacity.
• Float charge conditioning after swap: Li-SOCl2 cells exhibit passivation — a thin film builds on the lithium anode during storage. After fitting this cell, leave the panel on mains power for 24–48 hours before running a zone or diagnostic test. The passivation layer dissipates under float conditions; triggering the siren or running a full test before this window can cause a false low-battery report.

Alarm panel showing low battery hours after installing new cell

Li-SOCl2 cells develop a passivation layer during storage that temporarily raises internal resistance and suppresses the cell's apparent output voltage. The panel's battery supervision circuit reads this as a low or fault condition even though the cell is fully charged. This is not a faulty battery — it resolves as the passivation layer breaks down under float charge. Leave the panel on mains power for a full 48 hours; the low-battery indication will clear once the cell stabilises above the panel's threshold, typically 3.4–3.5V under supervision load.

Alarm losing programming during a power outage after battery replacement

If the panel loses its zone configuration or user codes during a mains failure shortly after a battery swap, the new cell has not yet been accepted into the panel's backup circuit. Some panels require the battery to pass a charge-acceptance handshake before it is switched into the backup path. A cell still in passivation may not pass this check, so the panel defaults to unprotected RAM during an outage. Keep the panel on mains for 48 hours post-installation, then verify backup status in the engineer menu — most panels display a "battery OK" or equivalent status once the cell is fully conditioned.