> 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/general-information/safety-guidelines.md).

# Safety guidelines

## General <a href="#general" id="general"></a>

* Always **read the full user manual** before using the device.
* The loggers must be used only for their intended purpose: to measure physical or environmental values and wirelessly transmit these measurements to a server platform, under the operating conditions described in the manual.
* Do **not** perform modifications, unauthorized repairs or internal alterations to the loggers or their enclosures - doing so voids warranty and may create safety hazards.
* **In case you have any questions, please contact our technical support at** [**help.efento.io**](https://help.efento.io/)

## Power Supply

Efento NB-IoT loggers are available in two power supply configurations, designed to match the requirements of your specific deployment environment.

### Power configurations

* **External Power Supply**: Powered via **USB C (5V, 1A)** or **9-26V DC**, this version features an integrated 1300 mAh Li-Po backup battery to ensure continuous operation during external power outages.
* **Replaceable Battery**: Powered by a high-capacity, replaceable battery pack consisting of an ER26500H cell paired with an SPC1520 capacitor (8500 mAh, 3.6 V), designed for long-term, autonomous operation.

### External Power Supply (USB C 5V, 1A  / 9-26V)

For devices powered via an external source, please follow these safety guidelines to ensure reliable operation and prevent electrical hazards:

* **Use compatible power sources**: Always use high-quality, certified power adapters. Incorrect voltage or current ratings can cause overheating, unstable operation, or permanent damage to the logger.
* **Environmental safety**: Ensure the power adapter and cables are used in a dry environment. Keep connectors free from moisture to prevent short circuits.
* **Cable maintenance**: Inspect power cables regularly. Do not use frayed, loose, or damaged cables, as these pose a risk of fire or electric shock.
* **Li-Po Backup Battery Safety**: The internal Li-Po battery is intended for backup use only.
  * **Avoid extreme temperatures**: Do not expose the device to extreme heat or cold, as this may cause battery swelling, degradation, or capacity loss.
  * **Signs of malfunction**: If you notice unusual heat, odors, discoloration, or swelling, disconnect the power supply immediately and discontinue use.
  * **Do not open**: The backup battery is built into the device. Do not attempt to open or replace it yourself; service must be performed by authorized personnel only.

{% hint style="danger" %}
**While Li-Po batteries are safe when handled correctly, improper use may lead to reduced performance, damage, or safety hazards.**
{% endhint %}

### Replaceable Battery (ER26500H + SPC1520)

For loggers utilizing the replaceable battery pack, ensure the following precautions are observed:

* **Do not recharge**: This battery pack is a non-rechargeable unit. Attempting to recharge it can lead to fire, explosion, or severe battery leakage.
* **Replacement**: When the battery reaches the end of its service life, replace it only with the specified battery pack type to maintain device performance and safety. Always follow the [battery replacement instructions](/nb-iot-loggers/installation/replacing-the-battery.md).

### General Battery Safety Warnings

The following safety protocols apply to all Efento NB-IoT loggers, regardless of the power supply type:

* **Integrity check**: Never use batteries that appear damaged, deformed, or otherwise compromised.
* **Physical handling**: Do not puncture, crush, or apply excessive pressure to the device or the battery housing. Physical damage may compromise the battery's integrity, leading to internal leakage, overheating, or failure.
* **Action on failure**: In the event of a battery malfunction or leakage, **discontinue use of the device immediately**. Do not attempt to repair the logger or handle the leaked material directly.

## Environmental / Operating conditions <a href="#environmental-operating-conditions" id="environmental-operating-conditions"></a>

* Do not expose the logger to **temperatures outside its specified operating range**. Exposing the device to extreme temperatures (too low, too high) may cause malfunction, damage, or loss of measurement accuracy.
* Store the device **protected from direct sunlight, heat sources, fire**, or other harsh environmental conditions.
* Avoid exposing the logger to **moisture, corrosive substances, or harsh chemicals** - unless the specific model is designed for such conditions (e.g. waterproof probes).

## Other risks and maintenance <a href="#installation-and-maintenance" id="installation-and-maintenance"></a>

Several other factors may affect the safe and reliable operation of the Efento NB-IoT loggers. To prevent device damage or operational issues, observe the following guidelines:

* During logger installation, be sure to follow the installation guidelines and best practices to ensure optimal performance and accuracy.
* Do **not** disassemble or tamper with the internal electronics of the logger. **Only perform maintenance recommended by manufacturer** (e.g., battery replacement).
* **Protect the device from mechanical shock**. Dropping, striking, or applying excessive force to the gateway may damage internal components, connectors, or the enclosure.
* Cleaning:
  * IP30 devices should be cleaned using dedicated electronics-safe cleaning products (such as those used for computers) or, alternatively, with a suitable disinfectant.
  * IP67 devices installed in rooms may be cleaned using the same methods applied for room cleaning, provided that the water pressure does not exceed **100 kPa (15 psi)**.
* **Avoid installing the device in unstable or vibrating locations.** Continuous movement or vibration can loosen connectors, damage components, or interrupt communication.
* **Keep the device away from strong electromagnetic fields**. Placing the gateway near high-power electrical equipment, industrial machinery, or magnetic sources may interfere with wireless communication or disrupt device operation.


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