500 Series System 500 Series System Accessories Batteries and chargers Battery SBT 520 AE Battery SBT 540 AE Battery SBT 550 AE Voltage 48 V 48 V 48 V Type of cells Lithium-ion battery Lithium-ion battery Lithium-ion battery Battery capacity 2 Ah 4 Ah 5 Ah Charging time (fast charger) 50 min 1 h 50 min 2 h Product weight 0.9 Kg 1.4 Kg 1.4 Kg Art Nr. 278012008/ST1 278014008/ST1 278015008/ST1 Warranty 2 years 2 years 2 years Standard Charger SCG 515 AE Fast Charger SFC 530 AE Voltage 48 V 48 V Charging speed Standard Fast Output current 1.5 A 3.0 A Product weight 0.6 Kg 0.75 Kg Art Nr. 278021008/ST1 278031008/ST1 Warranty 2 years 2 years 74