About this replacement
Glutz ES1 / 271964 — 3V Li-MnO2 Replacement Battery (CR-23ZCF2CN)
This is a 3V lithium manganese dioxide cell rated at 2700mAh (8.1Wh), direct fit for the Glutz 271964 and ES1 electronic door lock. It powers the lock's keyless entry mechanism, control board, and motor driver. The CR-23ZCF2CN form factor — 35.00 × 33.60 × 17.00mm — matches the original cell physically and electrically.
- ES1 and 271964 fit: Both models share the same battery bay, voltage rail, and BMS handshake. The CR-23ZCF2CN cell meets the 3V nominal requirement and 8.1Wh energy spec the lock's control board expects at startup.
- Bench tested on actual hardware: We cycled this cell under simulated lock actuation loads. The BMS held stable output through repeated motor-start draws, and the cell voltage held above 2.8V through full discharge depth.
- Post-swap access method check: After fitting this cell, test every access method — keypad, Bluetooth, and any keycard — before closing the door. Some Glutz ES1 units run a firmware handshake on first power-up after interruption. If that sequence is skipped, one or more access methods may not respond until the lock completes it.
Why the Glutz ES1 shows low battery immediately after a new cell is fitted
The ES1 control board reads cell voltage at startup and compares it against a threshold — typically around 2.7V. Li-MnO2 cells stored below 10°C can read lower than their actual charge state at initial load due to temporary internal resistance. If the cell has been in cold storage, let it reach room temperature before fitting it. After fitting, actuate the lock two or three times to allow the voltage reading to stabilise before trusting the battery indicator.
Bluetooth not reconnecting to the Glutz app after battery replacement
A full power interruption resets the lock's Bluetooth radio state on some ES1 firmware versions. The lock stops advertising to the app until it completes its internal boot sequence — this can take up to 30 seconds after the cell is seated. If the app still shows the lock as offline after that window, open the Glutz app, navigate to the device list, and force a re-scan. On older firmware, a manual re-pair from the app's device settings may be required before Bluetooth control resumes.