Kit includes original HL-GP401 batteryFully compatible with original Hero 4 batteriesCharge TWO Hero 4 batteries simultaneouslyInternal power bank provies emergency charging on the goBatteries fully charged in 2.5 hoursUp to 5 hours of recording timeMini USB to USB cable included Over dit product Art.nr.:1000.387.1 Merk:Hahnel Maat:O/S Hahnel Duopal Extra Kit For Hero4 Accu O/S