The amber/yellow light indicates the unit is delivering current.

The battery is too damaged to hold a charge. Sparking Prevention

Use this for automotive, marine, and deep-cycle batteries that need to be charged quickly (usually 3–5 hours for a standard car battery).

While optimized for standard lead-acid, the 2A setting is generally safe for maintaining AGM batteries, though specialized AGM chargers are often preferred for rapid charging.

Before connecting, ensure the area is well-ventilated. If the battery is inside a vehicle, turn off all electronics and remove the keys from the ignition. 2. Connecting the Charger

MotoMaster Battery Charger 11-1567-8: The Ultimate User Guide and Manual