> For the complete documentation index, see [llms.txt](https://docs.efento.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.efento.io/nb-iot-loggers/installation/replacing-the-battery.md). # Replacing the battery Please note that these instructions apply only to **Efento NB-IoT loggers configured with the replaceable battery pack (ER26500H + SPC1520)**. If your device utilizes the external power supply version (USB / 9-26V DC), it operates on continuous external power with a sealed internal backup battery, meaning regular battery maintenance or manual replacement is not required. {% hint style="info" %} Data Persistence Notice: You do not need to worry about data loss during this procedure. All configuration settings, calibration data, and stored measurements are saved in the device's non-volatile memory and will remain fully intact while the battery is disconnected. {% endhint %} ## Battery safety guidelines To prevent accidents, personal injury, or permanent damage to the logger, adhere strictly to the following safety protocols during battery replacement: * **Do not recharge**: The ER26500H + SPC1520 battery pack is **strictly non-rechargeable**. Attempting to charge this battery can result in overheating, internal gas build-up, fire, or explosion. * **Inspect the new battery**: Never install a battery pack that appears dented, swollen, scratched, leaking, or otherwise physically deformed. * **Correct disposal**: Do not throw depleted batteries into standard household or industrial waste bins. **Lithium thionyl chloride batteries are hazardous waste**. They must be collected separately and disposed of at a certified local electronics recycling center or an authorized hazardous waste disposal facility in compliance with local environmental regulations. * **Avoid short circuits**: Keep the battery pack away from loose metal objects (such as screws, tools, or keys) during the replacement process. Short-circuiting the terminals can cause an instantaneous high-current discharge, leading to extreme heat or chemical failure. {% hint style="warning" %} WARNING: The battery pack must only be replaced when the logger is completely powered off. Before disconnecting the old battery, ensure you have turned off the device by pressing and holding the power button for 7 seconds until the shutdown LED sequence completes. Attempting to replace the battery while the logger is active or transmitting can interrupt ongoing system processes and potentially damage the internal electronic components. {% endhint %} ## **IP30 enclosures** 1. **Open the casing**: Use a flat tool or a small screwdriver to gently pry open the back panel of the logger enclosure. 2. **Power off the logger**: Press and hold the power button on the PCB for 7 seconds. Both LEDs will start blinking in a distinct pattern, indicating that the logger is shutting down and turning off its radio modules. 3. **Access the board**: Remove the two screws holding down the internal protective plastic cover, lift the plastic shield, and gently lift out the mainboard. 4. **Remove the old battery**: Disconnect the white battery connector from the socket on the Printed Circuit Board (PCB) and remove the depleted battery pack from its housing slot. 5. **Install the new battery**: Place the new battery pack into the designated slot. Carefully plug the battery connector into the socket on the PCB (the connector is keyed to ensure correct polarity). 6. **Reassemble the device**: Place the mainboard back into its proper position, put the plastic cover on, and secure it with the two internal screws 7. **Power on the logger**: Press and hold the power button situated directly on the PCB for 2 seconds. Both LEDs on the board will begin blinking to indicate that the device has successfully initialized and is searching for the cellular network. 8. **Close the casing**: Align the back panel cover and snap it firmly back into place. ## **IP67 enclosures** 1. **Open the casing**: Unscrew the external screws securing the front and back panels together, then carefully remove the front cover. 2. **Power off the logger**: Press and hold the power button on the PCB for 7 seconds. Both LEDs will start blinking in a distinct pattern, indicating that the logger is shutting down and turning off its radio modules. 3. **Access the board**: Remove the two screws holding down the internal protective plastic cover, lift the plastic shield, and gently lift out the mainboard. 4. **Swap the battery**: Disconnect the power connector from the PCB socket. Replace the old battery pack with the fresh unit, seating it firmly in the battery compartment, and attach the connector back to the PCB socket. 5. **Reassemble the device**: Place the mainboard back into its proper position, put the plastic cover on, and secure it with the two internal screws 6. **Power on the logger**: Press and hold the power button situated directly on the PCB for 2 seconds. Both LEDs on the board will begin blinking to indicate that the device has successfully initialized and is searching for the cellular network. 7. **Reseal the enclosure**: Check that the perimeter rubber gasket is clean and properly seated. Re-attach the external front cover and tighten the external screws evenly to maintain water resistance. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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