NOCO Genius GENIUS1EU Guide D'utilisation Et Garantie page 7

Understanding Charge LEDs.
The charger has one (1) Charge LED. This Charge LED indicates the connected battery(s) state-of-charge (SOC). See the explanation below:
LED
Pulsing Red LED
Pulsing Green LED
Solid Green LED
Maintenance Green LED
Understanding Error LEDs.
Error Conditions will be indicated by the following LEDs.
LED Reason/Solution
Solid Charger is in Standby mode or Battery voltage is too low for charger to detect.
Solid
Battery voltage is too high for the selected charge mode. Check the battery and charge mode.
Solid
Possible battery short / Battery will not hold a charge. Have battery checked by a professional.
Solid
Reverse polarity. Reverse the battery connections.
Flashing
Charger internal temperature too high / Charger will resume function once the Charger internal temperature drops.
Charger ambient temperature too cold / Charger will resume function once the Charger ambient temperature rises.
Explanation
The Charge LED will slowly pulse "on" and "off" when the battery is less than 75% fully charged.
Bulk charge complete, optimizing battery for extended life.
When the battery is 100% charged, the Charge LED will be solid green.
After the battery is fully charged, the charger will continue monitoring the battery, and provide ongoing maintenance and
optimization. The 100% Charge LED will pulse "on" and "off" slowly during these cycles. The charger can be left connected
to the battery indefinitely.
EN