Gira 148900 Alarm System Compatible Battery 7.2V 6500mAh

Gira 148900 — 7.2V Li-SOCl2 Replacement Battery

This is a 7.2V 6500mAh lithium thionyl chloride cell that replaces the Gira OEM part 148900. It fits Gira alarm system panels that rely on backup battery power during mains outages. Voltage, capacity, and physical dimensions (101.50 × 51.80 × 26.00mm) match the original cell.

• Gira alarm panel compatibility: Gira backup cells use a specific voltage rail and connector footprint. The 148900 designation locks in the cell format — any deviation in voltage or physical size triggers a BMS rejection or a persistent fault on the panel.
• Bench tested on actual hardware: We ran this cell through charge acceptance and load response checks. The BMS handshake completed without fault codes, and the cell held voltage under simulated backup draw without tripping the low-battery threshold.
• Float charge conditioning after swap: Li-SOCl2 cells in alarm panels require 24–48 hours on float charge before the panel accepts full capacity. Do not run a zone or siren test immediately after fitting — the panel will log a low-battery event against a cell that is still conditioning.

Alarm panel showing low battery hours after installing the new cell

Li-SOCl2 cells ship in a partially passivated state. The panel's voltage monitor reads the open-circuit voltage of an un-conditioned cell and flags it as low — even though the cell is not faulty. The BMS needs sustained float charge across 24–48 hours before it updates the battery status register. Leave the panel on mains power for two full days before checking the battery indicator or running any diagnostic.

Alarm losing saved programming during a mains outage after battery replacement

If the panel drops its configuration during a power cut, the backup cell has not yet been accepted by the charge controller. A freshly installed Li-SOCl2 cell may show adequate open-circuit voltage but still fail to supply enough current at the moment mains drops, because the passivation layer has not fully broken down. This is not a defective cell — it is a conditioning gap. Allow 48 hours on mains before the next outage test, and confirm the panel reports battery OK before relying on backup.