Aritech AS270-D Replacement Battery 12V 12Ah

Aritech AS270-D / TX-7201-05-1 — 12V Li-MnO2 Replacement Battery

This is a 12V 12000mAh lithium manganese dioxide backup cell for the Aritech AS270-D alarm panel, TX-7201-05-1, and compatible UTC siren units. It sits on continuous float charge and takes over the moment mains power drops. Capacity figures come directly from the product data — 144Wh at 12V.

• AS270-D, TX-7201-05-1, and UTC siren compatibility: These units share a 12V backup rail and the same physical cell format. The charge management circuit in each device operates at the same float voltage, so one cell chemistry covers all three without BMS conflicts.
• Bench tested on actual hardware: We cycled this cell through simulated mains-loss events on a matched panel. The BMS held float voltage steady and logged no fault codes during the switchover or return-to-mains transition.
• Post-install float charge window: Do not trigger a zone test immediately after fitting this cell. Allow 24–48 hours on float charge first. Running a diagnostic too early can cause the panel to report a low battery fault before the cell has stabilised at its rated voltage.

Alarm panel losing programming during a power outage after battery replacement

If the panel wipes its configuration during a mains failure shortly after a cell swap, the new battery had not yet been accepted by the panel's charge controller. Li-MnO2 cells fresh from storage can sit slightly below the float threshold the panel expects to see before it treats the backup supply as valid. The panel then falls back to an unprotected state when mains drops. Give the cell a full 48-hour conditioning period on float before the next power-cycle test — at that point the panel should read the cell above its minimum backup threshold.

Siren not sounding during a test after backup battery replacement

A newly fitted cell can cause the siren to stay silent on the first test activation. The siren driver circuit delays trigger output by 30–60 seconds when it detects a freshly connected cell, allowing charge to stabilise before drawing the high-current burst the sounder needs. This is not a wiring fault or a dead cell. Wait at least 60 seconds after the panel completes its startup cycle, then re-run the test — the siren should respond once the driver confirms voltage is stable above 11.8V.