About this replacement
Technaxx TX-28 Monitor — 7.4V Li-Polymer Replacement Battery (HHS405060)
This 7.4V 1100mAh Li-Polymer cell replaces the original HHS405060 battery in the Technaxx TX-28 Monitor wireless home security camera. It restores power to the camera's recording, motion detection, and wireless transmission functions. Dimensions are 69.50 × 44.40 × 7.30mm — measure your original cell before ordering if unsure.
- TX-28 Monitor fit: The TX-28 uses a single Li-Polymer cell with a protection circuit that handshakes on the same connector and voltage rail as the HHS405060. No adapter or rewiring needed — the BMS footprint matches the original.
- Bench tested on actual hardware: We cycled this cell through the TX-28's full motion-detection and WiFi-transmit load sequence. The BMS held stable across repeated IR LED plus processor current spikes without tripping into protection cutoff.
- First-install power cycle: After fitting this battery, power cycle the TX-28 once through the app. The camera's firmware must re-register the new cell before motion events log correctly to cloud storage — skipping this step can cause missed triggers even when the camera appears online.
TX-28 going offline in the app after a battery swap
Swapping the cell clears the camera's active session token — the TX-28 does not automatically re-authenticate to the Technaxx cloud after a power interruption. The app will show the device as offline even though the camera has power and the WiFi indicator is lit. Open the Technaxx app, remove the device from your device list, and re-add it using the standard pairing process. Once re-registered, live view and motion alerts resume normally.
App reporting 0% or incorrect charge percentage after install
The TX-28 reads battery level using a voltage-threshold indicator, not a fuel-gauge IC. When a new cell is first installed, the camera has no voltage history to calibrate against, so it defaults to 0% or displays an erratic value. Run the battery down to the automatic low-battery cutoff — typically around 6.0V — then charge it fully in one uninterrupted session. After one complete cycle the voltage thresholds align and the app percentage reads correctly.