MK 220D. 2 Banks. Output per Bank: 10 Amps. Total Output: 20 Amps. Charge Time: 4 to 6 Hours. 13-1/2″ L x 7-1/2″ W x 4″ H. Digital Control: Microprocessor-based design delivers a faster, more precise charge every time Automatic Temperature Compensation: Chargers sense and adjust to ambient temperature fluctuations to ensure a fast, accurate charge. LED Indicator Lights: Inform of charge stage, maintenance mode status, error notifications and full charge Automatic Multi-Stage Charging: Controls the voltage and current your battery gets throughout the charging cycle, ensuring a fast, safe & precise charge. Waterproof Construction: All on-board chargers are built to be waterproof, shock-resistant and vibration-resistant. Saltwater tested. Supported Battery Types: 12v AGM, 12v Flooded Lead Acid, 12v Lithium LiFeP04.