# 3) Charging the battery and battery life

#### **Charging your instrument**

To charge your instrument, simply connect the instrument’s **USB-C port** to a USB power source (computer, wall charger, power bank, etc.).

You can check the charge status directly on the instrument’s screen. The charge LEDs also indicate the status:

* **Red LED:** instrument charging
* **Blue LED:** battery fully charged

A full charge takes approximately **3 hours**.

The instrument can be used normally while charging, including during flight.

To stop charging, simply disconnect the USB-C cable. The Li-ion battery has **no memory effect**.

⚠️ **Important note:** To preserve battery lifespan, in case of long-term storage (several months), it is recommended to keep the instrument at around **60% charge**. Avoid storing the instrument with a fully discharged or fully charged battery for extended periods.

⚠️ **Important note:** Avoid exposing the instrument to **high temperatures** (for example behind a windshield in direct sunlight or near a heat source), especially while charging. High temperatures accelerate battery aging.

⚠️ **Important note:** To ensure optimal charging and instrument safety, use a **compliant USB charger**. Charging via a computer USB port, power bank, or standard wall charger is perfectly suitable.

#### **Estimated battery life**

Battery life depends on several usage parameters.\
Depending on the selected settings, it can vary significantly.

Below is a table providing an **estimated battery life** depending on your usage:

| Usage configuration             | Backlight | Bluetooth              | Estimated battery life (Alti V4) | Estimated battery life (GPS V4) |
| ------------------------------- | --------- | ---------------------- | -------------------------------- | ------------------------------- |
| **Power saving mode**           | OFF       | Disabled               | ≈ 60 h                           | ≈ 30–35 h                       |
| **Leisure flight**              | AUTO      | Disabled or occasional | ≈ 50 h                           | ≈ 25–30 h                       |
| **Cross-country / competition** | AUTO      | Continuously enabled   | ≈ 40 h                           | ≈ 20–25 h                       |
| **Permanent high brightness**   | Maximum   | Continuously enabled   | ≈ 25 h                           | ≈ 15 h                          |

The Alti V4 offers approximately twice the battery life of the GPS V4 under typical usage.