1100-000080 WIR Elektronik eU340 Smart Safe 14.8V Li-Polymer Battery

WIR Elektronik switch eUhr eU340 Smart Safe — 14.8V Li-Polymer Replacement Battery (1100-000080)

This 14.8V, 450mAh Li-Polymer battery replaces part number 1100-000080 in the WIR Elektronik switch eUhr eU340 Smart Safe. The eU340 is a compact smart home safe with an electronic locking mechanism and access control system. When the original cell loses capacity, the lock controller loses stable power — this replacement restores it.

• eU340 locking system compatibility: The eU340 uses a 14.8V four-cell Li-Polymer pack to power both the electronic lock actuator and the access control board simultaneously. Both circuits draw from the same rail, so voltage accuracy matters — an underspec cell trips the BMS before the actuator finishes its cycle.
• Bench tested on actual hardware: We cycled this cell through lock engage and disengage sequences under load. The BMS held voltage within spec across both the actuator spike and the standby draw without triggering a cutoff event.
• Post-installation lock cycle: After fitting this battery, run one full manual lock-and-unlock cycle before relying on the safe. The eU340 control board re-validates actuator response on the first cycle after power interruption — skipping this step can leave the lock state reported incorrectly in the app.

eU340 going offline in the smart home app after battery swap

The eU340 drops off the mesh network every time power is interrupted, including during a battery swap. After installing the new cell, the device runs a network re-join sequence that takes up to 60 seconds. Do not attempt to trigger the lock or interact with the app during this window. If the device does not reappear in the app after 90 seconds, press the pairing button on the unit to force a re-join.

Low battery alert appearing immediately after fitting a new cell

Li-Polymer cells lose charge during storage — if the replacement has been on a shelf, its resting voltage may sit below the eU340's low-battery alert threshold, typically around 13.2V for a 14.8V four-cell pack. The alert fires the moment the controller reads that voltage, even with a brand-new cell installed. Connect the safe to its charge source and allow it to charge until the alert clears. Check the app for a green status indicator before treating the alert as a fault.