Pyronix CR34615M Enforcer Deltabell 3.6V Li-SOCl2 Alarm Battery

Pyronix Enforcer Deltabell Siren Alarm — 3.6V Li-SOCl2 Replacement Battery (CR34615M)

This is a 3.6V Li-SOCl2 cell rated at 14500mAh (52.2Wh), direct replacement for the Pyronix Enforcer Deltabell external sounder. The Deltabell uses this cell to maintain wireless connectivity and trigger audible alerts during alarm events. It matches OEM part number CR34615M and fits the Deltabell's internal battery bay without modification.

• Enforcer Deltabell compatibility: The Deltabell draws continuously low current to maintain its wireless link to the control panel, with sharp current spikes during sounder activation. Li-SOCl2 chemistry handles this combination — steady standby drain plus brief high-current bursts — better than alkaline or Li-MnO2 alternatives at the same form factor.
• Bench tested on actual hardware: We ran this cell through a simulated Deltabell load cycle, monitoring the output under both standby draw and siren-trigger spikes. Voltage held steady across both phases, and the cell's internal protection responded correctly to pulse loads without tripping.
• Post-installation panel reporting: Do not run a zone test immediately after fitting this cell. Allow 24–48 hours on float charge before triggering a diagnostic. A fresh Li-SOCl2 cell needs time to stabilise — the panel BMS may flag low battery during early testing even when the cell is fully functional.

Why the Deltabell shows low battery hours after a new cell is fitted

Li-SOCl2 cells have a passivation layer that forms on the anode during storage. This layer temporarily increases internal resistance, causing the panel to read a lower-than-actual voltage on initial load. The Enforcer panel interprets this as a weak battery and logs or displays a low-battery fault. The passivation layer dissipates within 24–48 hours of the cell being under load, after which the panel should clear the fault and report normal status.

Deltabell siren silent on test after battery swap

If the sounder fails to trigger during a walk test shortly after installation, the cause is usually the cell not yet past its passivation phase rather than a wiring or panel fault. The Deltabell requires a stable voltage above 3.2V under load before the sounder circuit activates. Running a full alarm trigger test before that threshold is consistently met can result in a silent or delayed response. Wait 48 hours post-installation, then trigger the test — if the siren still does not sound, check the tamper loop is fully closed and the lid seated correctly before re-testing.