Normal Li-ion batteries offer 100W/8A output and suitable for most ENG cameras, but the Cine Cameras such as ALEXA require around 85W high draw which is too heavy for the normal Li-ion batteries: the battery life will be reduced if long time full draw powering. Moreover, if therere monitor, lighting work together, and total power will be above 100W, and the normal batteries can not draw completely. Using S-8210A high-load battery, you can get MAX 150W/12A constant power output, which can drive more high power cameras, lightings and other equipments easily, and wont reduce battery life during long time high power output. Consists of 16pcs 18650 battery cells, and reaches 115Wh / 8Ah high capacity. Can run approx 4 hours for normal 30W ENG cameras; and approx 1.3 hours for ARRI Alexa camera. On the side of the battery, therere 4-level LED power indicators to check the battery remaining capacity.