Jablotron JA-150A Replacement Battery 3.6V 300mAh

Jablotron JA-150A — 3.6V Ni-MH Replacement Battery (BAT-3V6-N170)

This is a 3.6V 300mAh Ni-MH cell matching OEM part BAT-3V6-N170. It fits the Jablotron JA-150A wireless alarm system transmitter. When the original cell depletes, the transmitter stops detecting and reporting security alerts — this battery restores that function.

• JA-150A transmitter compatibility: The JA-150A uses a low-draw 3.6V Ni-MH cell to power continuous standby and zone-event transmission. The voltage rail and connector pinout on BAT-3V6-N170 match the original cell exactly, so the transmitter's internal circuitry accepts the replacement without reconfiguration.
• Bench tested on actual hardware: We cycled this cell through standby draw and simulated zone-trigger events. The BMS accepted the charge curve without flagging a fault, and the transmitter reported zone events correctly throughout the test sequence.
• Post-installation stabilisation on Jablotron panels: Do not run a zone test immediately after fitting this cell. The panel needs 24–48 hours on float charge before its internal monitor will report a full cell. Testing too early can trigger a false low-battery warning, even though the cell is healthy and charging correctly.

Alarm panel showing low battery hours after installing a new cell

The JA-150A transmitter and its associated panel use a voltage-threshold monitor that checks cell state at regular intervals. A freshly installed Ni-MH cell starts below the float voltage and takes time to reach the threshold the panel expects. If the panel checks during this window, it logs a low-battery event even though the cell is good. Leave the system powered and undisturbed for 48 hours — the panel should clear the fault automatically once the cell reaches approximately 4.2V under float charge.

Alarm losing programming during a mains power outage after battery swap

A freshly fitted Ni-MH cell has not yet completed its initial conditioning cycle and cannot sustain the backup load the panel draws during a mains failure. If a power cut happens in the first 24–48 hours after installation, stored programming can be lost because the cell voltage collapses under load before conditioning is complete. To avoid this, allow a full 48-hour charge period on mains power before relying on the battery for backup. After that window, trigger a deliberate short mains-off test — the panel should hold programming and restore cleanly at 3.6V nominal.