Elios 3 Battery LED Indicators: Explained

The Elios 3 battery uses LED indicators to communicate battery status, charge state, and fault conditions. Understanding these LED patterns helps identify whether behaviour is normal or requires escalation.

A solid green LED indication shows the battery is powered, within a normal operating range, and ready for use. When connected to the aircraft, this indicates the battery has passed initial checks and is supplying power correctly.

Flashing green LEDs indicate the battery is actively charging or discharging. The number of illuminated LEDs typically represents the approximate state of charge. This is normal behaviour during charging or flight preparation.

Slow flashing green usually indicates the battery is in standby or storage mode. The battery is awake but not actively charging or supplying power. This is expected when the battery is idle.

Magenta (purple) LED indications show the battery is communicating with the aircraft or charger and is in a system-controlled state. This is commonly seen during boot-up, firmware checks, or initialisation.
Brief magenta illumination is normal. If the battery remains magenta for an extended period and does not progress to green, this may indicate a communication or handshake issue.

A solid amber or yellow indication means the battery is within a cautionary range. This is most commonly related to temperature, such as the battery being too cold or too warm to charge or operate at full performance.

Flashing amber indicates the battery has detected a temporary protection condition. Charging or discharge may be paused until the condition clears. This often resolves once the battery returns to a safe temperature range.

Red LED indications signal a fault condition detected by the battery management system. This may include cell imbalance, over-temperature, over-current, or internal communication errors.

Flashing red LEDs indicate a critical fault or lockout state. In this condition, the battery may refuse to charge or power the aircraft and should be removed from service.

If magenta LEDs persist beyond normal boot-up, reseat the battery and restart the aircraft or charger.
If amber LEDs are shown, allow the battery to stabilise at room temperature and retry.
If red or flashing red LEDs persist after reseating and power cycling, the battery should not be used and must be escalated for inspection.