GYS Neostart 620 Heavy Duty Battery Charger / Jump Starter. GYS Neostart 620 heavy duty battery charger and jump starter. 12/24V acid batteries 20-1350Ah, c/w wheels and on-board storage for cables and clamps. Protected against short circuits, polarity reversals, and overvoltage. Traditional charger, charging must be monitored. Externally visible and easily accessible fuse. Max charge …