The Ring RSC804 is a 4A smart charger and battery maintainer suitable for 6V and 12V vehicles, recommended for START/STOP batteries. It is compatible with lead acid, gel, calcium, EFB, and AGM batteries, and keeps them in good condition without the risk of overcharging. The charger features one-button operation, a large LCD backlit display for ease of use, and safety protections such as reverse polarity and short-circuit protection. It automatically adjusts to a long-term maintenance mode when the vehicle's battery is full. The charger offers a 7-stage charging process that adapts to the battery type and has a charge rate selection of up to 4A. It is IP65 rated for use in all weather conditions and includes a cold weather charging mode. Quick connectors with clamps or O-ring terminals are provided for long-term connection. This charger is ideal for seasonal vehicles and motorcycles, ensuring longer-lasting, reliable batteries.