Bescor Extended Battery & Automatic Charger for Black Magic Design Cinema Camera 3 to 4 times more run time than offered by the Internal battery. An advanced Lithium-ion technology chemistry. An output voltage and amperage of 14.8VOC and 6.6 Ah The BM-LiON operates between 12 and 16.8 VOC Features a 2.5mm barrel connector with 3 feet of wire.