> For the complete documentation index, see [llms.txt](https://linemasters-organization.gitbook.io/linemaster-2.4ghz-zephyr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://linemasters-organization.gitbook.io/linemaster-2.4ghz-zephyr/basic-information/battery-use-and-care.md).

# Battery Use and Care

{% hint style="warning" %}
Before you start fully charge the battery before flying. This practice is not strictly necessary for operation, but it is a safety and reliability recommendation. By following it, you acknowledge that you are responsible for the correct use of the battery and the equipment.
{% endhint %}

### How to Charge the Handle

1. Locate the **USB-C port** at the base of the handle. 
2. Connect the **included cable**. You may use any reliable USB-C cable. 
3. It is recommended to charge with the handle **turned off** for faster charging; if left **on**, it will simply take longer. 
4. Upon connection: 
5. A **red side LED** turns on → **charging**.
6. Once charging is complete, the **red LED turns off** and a **blue LED** turns on → **charge complete**.

Charging may take **several hours**, depending on the initial level and battery condition. **Be patient.**

A mild **warm sensation** near the USB port and LEDs during charging is **normal**. Do not cover the equipment or expose it to direct sunlight.

{% hint style="warning" %}
**Never** leave the handle unattended while charging.
{% endhint %}

### Important Warning

18650 Li-ion cells store a large amount of energy. Incorrect use can cause **overheating, fire, explosion, burns,** or damage to the equipment.

* Always use batteries and cables in **good condition**.
* Do **not** puncture, strike, disassemble, or short-circuit the battery.
* Charge on a **non-flammable surface**, in a **well-ventilated area**, and **under supervision**.
* **Do not** leave the handle unattended while charging.
* If you detect unusual smell, smoke, crackling sounds, swelling, or abnormal temperature, **disconnect immediately** and let it cool down in a safe place.

{% hint style="warning" %}
Correct battery handling is the user’s responsibility. The manufacturer assumes no liability for damage caused by misuse, unreliable accessories, or failure to follow these instructions.
{% endhint %}

### Battery Life and Replacement

In continuous-use tests — transmitting to a receiver without pauses — the handle reached **≈11 hours** per charge with a 2500mAh battery. Under normal use, the battery should last **several days**. Actual runtime will vary depending on usage intensity, temperature, and cell age.

#### Battery Replacement

You may replace the battery if it deteriorates or if you prefer to carry a charged spare cell.

1. **Turn off** the handle before starting (prevents damage and short circuits).
2. Remove the **screw** securing the battery cover and take it off.
3. Remove the used cell and insert a **18650 Li-ion “flat-top”** cell.
4. **Respect the polarity** indicated on the battery socket. Do **not** force the cell.
5. Replace the cover and screw.
6. A minimum capacity of **2000 mAh** is recommended for performance similar to test results.
7. **Do not** use damaged batteries (dented, swollen, with torn wrap, or that overheat excessively). Dispose of cells according to local regulations.

### Good Practices

* Charge on a stable surface, away from combustible materials.
* Disconnect the cable once charging is complete.
* **If the equipment will be stored for an extended period, it is recommended to remove the battery to prevent slow discharge while the device is off.** If the expected downtime is short, leave the battery partially charged and check its level periodically.

With these guidelines, your handle will be ready to fly safely and reliably.