In high-end cinema production, reliable and intelligent power solutions are just as essential as the camera itself. SWIT’s B-Mount battery series was designed with this principle in mind — delivering the stability, output, and smart features required by today’s flagship cinema systems such as the ARRI Alexa 35 and Blackmagic URSA Cine.
What is B-Mount?
B-Mount is a new open standard developed in collaboration with ARRI, offering a 24V (28.8V) nominal voltage and intelligent communication between battery and camera. It solves the growing demands for higher power output, safety, and flexibility on set — all in a future-proof form factor.
Why B-Mount 28.8V Batteries are Essential for URSA Cine
Blackmagic Design has officially stated that the URSA Cine performs best when powered in the 24–34V voltage range — the operating window of B-Mount systems. Using a 28.8V B-Mount battery ensures:
High Frame Rate Recording: Lower-voltage power sources (like 12–18V V-mount or Gold-mount batteries) limit URSA Cine to 60fps or below. With 28.8V B-Mount, the camera can unlock full frame rate potential, essential for slow motion or high-action footage.
Accessory Power via Camera Ports: Only with sufficient voltage can the URSA Cine power multiple accessories directly from its RS and EXT outputs — no need for separate power boxes or splitters, reducing rig complexity.
Lower Heat, More Stability: Higher voltage reduces current draw, minimizing thermal loss and improving overall system efficiency and stability during long takes or high-load shooting.
In short, B-Mount isn’t just a new format — it’s a technical requirement to fully unleash the URSA Cine’s capabilities.
Key Benefits of SWIT B-Mount Batteries:
True 28.8V Nominal Output
Ideal for modern digital cinema cameras, SWIT’s B-Mount batteries deliver a steady 28.8V (compatible with 24–34V operating ranges), ensuring your camera performs at peak — even under high power draw.Full Communication with Camera
The battery communicates real-time status, remaining runtime, cycle life, and error info directly to supported camera systems, minimizing guesswork and downtime.Wide Capacity Range
From compact 98Wh models like the BIVO-98 to high-capacity 290Wh bricks like the BIVO-290, SWIT’s lineup covers handheld, shoulder-mount, and studio-style configurations.Robust Construction
Industrial-grade housing, reliable connectors, and safety circuits protect against over-voltage, over-current, and thermal hazards — even in harsh shooting environments.Full Charging Ecosystem
SWIT offers high-speed B-Mount chargers, including MATRIX-B8 (8-channel simultaneous charger), PC-P461B (4-channel simultaneous charger) and S-3822B (portable 2-channel), ensuring fast turnaround on set.
Compatible Cameras:
Blackmagic URSA Cine 12K/17K
ARRI Alexa 35
ARRI Alexa LF / Mini LF (via adapter)
And all B-Mount standard devices
Why Choose SWIT?
With decades of experience in powering film and broadcast gear, SWIT is trusted worldwide for its focus on reliability, efficiency, and support. Our B-Mount series continues this tradition — built to meet the future of cinema.
Explore the full lineup: SWIT BIVO
