The Sigma 1/5 has seven (7) charging modes: 12V, 12V AGM, 12V LITHIUM, 6V, 6V AGM, 12V Repair and 12V Loading (Force mode).
It is important to understand the differences and purpose of each charge mode. Please always check with battery manufacturer to confirm the right charge mode for your specific battery. Do not operate the charger until you confirm the appropriate charge mode for your battery. Below is a brief description:
About how to charge your battery with Sigma battery charger, please check this link: Charge your battery with Sigma 1 battery charger