The IndiPRO Tools Power Grid for Blackmagic Production Camera 4K, featuring two Sony L Series battery bays, is a single clamp rod mount power solution. It supports one Sony L Series battery on each side and draws power from both simultaneously, allowing a substantial increase in the camera 39;s run time. The supported DV batteries come in different sizes, some very lightweight and the Power Grid itself weighs only 0.4 lb, so Power Grid can be set up as a lightweight solution. Batteries are sold separately. Power Grid connects to the camera via a right angle DC connector on an 18 cable. The Power Grid requires both batteries to be attached at all times, but it also provides continuous power to the camera 39;s internal battery, keeping it at full capacity at all times, so you can swap the two Sony L Series batteries for two other ones without the camera powering off. An LED indicator on the Power Grid lights up and remains lit as long as the two Sony L Series batteries have sufficient power.