The S-8172S is a V-mount battery, which can be split into 2 parts of total 158Wh (79Wh + 79Wh) capacity, with a D-tap socket for camera light or other equipments. It has a 4-level LED indicator to give you a view of remaining battery life. The Li-ion contents of each part of S-8172S meets the regulations of the IATA. The build-in intelligent circuit has multiple protections of abnormal current, voltage and temperature. The S-8172S is compatible with SONY L40/L60/L90 Li-ion batteries.