20 V system and 4 A fast charging mode For charging high-performance 20 V lithium-ion Formula 1 LB200 and LB400 batteries Charging status indicator and intelligent microprocessor technology Overheat protection thanks to intelligent ventilation system LED monitoring for diagnosis of short circuit, overload and overheating Charging time for 2 Ah. Battery capacity: 40 minutes. Charging time for 4 Ah. Battery capacity: 60 minutes.