Jablotron JA-156E Replacement Battery 3.7V 2500mAh

Jablotron JA-156E — 3.7V Li-Polymer Replacement Battery (AHB954060P)

This 3.7V 2500mAh Li-Polymer cell replaces the AHB954060P battery inside the Jablotron JA-156E wireless PIR motion detector. The JA-156E is a perimeter sensor used in Jablotron alarm systems, and this cell powers both the motion-sensing hardware and the wireless transmission to the alarm panel. Dimensions are 62.60 × 36.10 × 9.10mm — verify these against your existing cell before ordering.

• JA-156E sensor fit: The JA-156E uses a single flat Li-Polymer cell at 3.7V nominal. The detector's onboard circuit monitors cell voltage directly and reports status back to the panel over the Jablotron bus. Any replacement cell must match the voltage rail and physical footprint exactly — even a few millimetres of difference will prevent the cover from closing and trigger a tamper fault.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Li-Polymer test rig. The protection circuit responded correctly to over-voltage, under-voltage, and short-circuit conditions. Capacity measured within 3% of the rated 2500mAh across three consecutive cycles.
• Post-installation float period: Do not run a zone diagnostic or walk-test immediately after fitting this cell. The JA-156E panel reports battery status based on float voltage, not instantaneous voltage. Allow 24–48 hours on charge before triggering any panel battery test — otherwise the panel may flag a low-battery event on a fully functional new cell.

Why the JA-156E reports low battery hours after a new cell is fitted

Jablotron alarm panels poll the sensor's battery voltage and compare it against a float-charge threshold, not a raw open-circuit voltage. A new Li-Polymer cell straight from storage often sits slightly below this threshold until the sensor's internal charge circuit tops it up. This process takes 24–48 hours at the low trickle current the JA-156E draws. If the panel runs a battery check during this window, it will read the cell as low even though the cell itself is not faulty. Wait the full 48 hours, then trigger the panel's battery test from the installer menu.

Tamper fault on the panel immediately after battery swap

The JA-156E has a tamper switch that activates when the detector cover is not fully seated. After replacing the battery, the cover must click firmly into both retention clips — a partial close is enough to keep the device looking shut but will leave the tamper contact open. The panel will log this as a tamper fault and may suppress zone alerts from that sensor. Press each corner of the cover until you hear both clips engage, then check the panel event log to confirm the tamper fault has cleared. If the fault persists, check that the replacement cell's thickness matches the original — an oversized cell can bow the cover and prevent a full close.