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A Block Battery is a very large battery that will supply your camera with many hours of operation. This usually sits on the dolly.

Assistant Camera Lens Cart Setup: A Step-by-Step Guide
5 Reasons BlueShape Batteries are the Best for Filmmakers
Into the Badlands was the testing ground for many pieces of new gear. Pushing equipment to its breaking point is what we do on features. One of the tools that we took with us was BlueShape batteries.
Blueshape Innovations for the Disney+ film Safety

Block Battery