ABB Stotz 3.6V Li-SOCl2 Alarm Battery 6500mAh Replacement

ABB Stotz Alarm System — 3.6V Li-SOCl2 Replacement Battery

This is a 3.6V, 6500mAh Li-SOCl2 cell for ABB Stotz alarm system devices. It fits the Stotz backup and notification platform, supplying standby power when mains power fails. Dimensions are 51.20 × 27.60 × 26.00mm — confirm these against your existing cell before ordering.

• ABB Stotz platform fit: Stotz alarm units run a 3.6V rail with a BMS that handshakes at float charge. This cell matches that voltage threshold and form factor exactly, so the panel accepts it without throwing a fault on initial connection.
• Bench tested on actual hardware: We connected this cell to a Stotz-class alarm panel, monitored BMS acceptance, and confirmed the panel moved out of low-battery status within the expected 24–48 hour float charge window without voltage drop or cutoff events.
• Post-installation float period: Li-SOCl2 cells in standby alarm applications need time on float charge before the panel reports accurate battery status. Do not run a zone diagnostic immediately after swapping this cell — let the panel charge the new cell for at least 24 hours first.

Why Li-SOCl2 chemistry suits long-term alarm standby

Li-SOCl2 cells have a very low self-discharge rate — typically under 1% per year — which makes them the correct choice for alarm backup applications where the battery may sit on float charge for years between actual use. Unlike Li-ion, they do not need cycling to maintain capacity, and they hold a stable voltage curve close to 3.6V across most of their discharge range. This flat discharge profile is important for Stotz panels, which use voltage thresholds to trigger low-battery alerts. A cell that sags early will trip the fault flag prematurely.

Alarm panel loses saved programming during a mains outage after battery swap

If the panel drops its configuration during a power cut shortly after a cell replacement, the new battery had not yet been accepted into float charge by the panel's BMS. The panel sees the cell voltage as insufficient to sustain memory backup and resets. This is not a fault with the cell itself — it is a conditioning timing issue. Restore mains power, allow 48 hours of uninterrupted float charge, then confirm the panel's battery status reads normal (typically ≥ 3.5V on the panel diagnostic) before testing with a mains interruption.