CaddX TX-7201-05-1 Compatible Battery 12V 12000mAh Li-MnO2

CaddX TX-7201-05-1 & TX7211-05-1 — 12V Li-MnO2 Replacement Battery (BS7201-N)

This is a 12V, 12000mAh lithium manganese dioxide backup battery for the CaddX TX-7201-05-1 alarm control panel and the TX7211-05-1 outdoor radio siren. It holds the system up during mains failure, keeping alarm zones, event logs, and panel programming live. OEM part number BS7201-N.

• TX-7201-05-1 panel and TX7211-05-1 siren compatibility: Both units share the same 12V backup rail and connector spec. The TX7211-05-1 outdoor siren draws its standby power from the same battery circuit as the panel, so a single cell services both devices in the standard wiring configuration.
• Bench tested on actual hardware: We ran this cell on the TX-7201-05-1 panel under simulated mains-off conditions. The BMS held output voltage steady above 11.5V throughout the discharge cycle, and the panel reported no low-battery fault until the cell reached end-of-discharge threshold.
• Float charge conditioning after installation: Do not run a zone or siren test immediately after fitting this cell. Allow 24–48 hours on the panel's float charger before triggering any diagnostic test. Li-MnO2 cells from extended storage can read low on the panel's battery monitor until the float charge cycle completes.

Alarm panel losing programming during a power outage after battery swap

If the panel drops its zone programming or event log when mains power fails, the replacement cell has not yet been accepted into the float charge circuit. A freshly installed Li-MnO2 cell can sit below the panel's acceptance threshold for up to 48 hours, leaving the backup circuit effectively open. During that window, a mains outage gives the panel no usable backup voltage, and non-volatile memory loses its supply rail. Leave mains power connected for a full 48-hour conditioning period before treating the backup as operational.

Panel reports low battery immediately after fitting a new cell

This is a float charge timing issue, not a fault with the cell. The TX-7201-05-1 polls battery voltage shortly after boot, and a new Li-MnO2 cell at storage voltage — typically around 12.0–12.2V — can fall just under the panel's reporting threshold. The panel clears the low-battery alert once float charge raises the cell above its threshold voltage, which takes 24–48 hours. If the fault persists beyond 48 hours, check the battery connector seating and confirm the charger output reads at least 13.5V at the battery terminals.