Bluetooth connectivity for connecting to mobile devices and using the my.FEIN app. Displays the current charge level and the number of previous charging cycles on a smartphone or tablet. Notification when the battery is fully charged. Short charging times thanks to the high charging current of 8 amps and process-controlled charging management. Large LED display with charge status indicator and USB port for mobile charging of small electronic devices. Compatible with all FEIN lithium-ion batteries. Charging times (80% of maximum capacity): 12 and 18 V / 3 Ah: 31 min, 12 and 18 V / 6 Ah: 38 min, 18 V / 5.2 Ah: 33 min.