KA-B21S V-mount to B-mount Conversion Plate
› Use V-mount batteries on B-mount cameras
› B-mount outputs V-mount battery voltage
› Active 28.8V of SWIT Bi-voltage V-mount battery
› Support 3rd party 26V/28.8V V-mount batteries
› Aluminum CNC unibody housing
› Multiple circuit protections
V-mount to B-mount Conversion
KA-B21S conversion plate allows you to adapt V-mount
batteries to the cameras with B-mount plate, like ARRI ALEXA
35, Blackmagicdesign URSA CINE.
KA-B21S doesn’ t change battery voltage. The B-mount side
outputs the same voltage of V-mount batteries.
28.8V Battery to Power ALEXA35
SWIT Bi-voltage V-mount battery recommended
Use SWIT PB-H290S 14.4V/28.8V Bi-voltage V-mount
battery, the KA-B21S plate will active 28.8V high voltage
output mode of PB-H290S, and provide 22-33.6V voltage to
power the B-mount cameras ALEXA 35 and BMD URSA CINE.
* The PB-H290S can output 14.4V for all regular V-mount
devices, and compatible with all regular V-mount chargers.
V-mount to Power ALEXA35
26V/28.8V V-mount Batteries Compatible
You can use pure 26V or 28.8V high voltage V-mount
batteries to power ALEXA 35 by KA-B21S conversion
plate. SWIT HB-C420S 28.8V 420Wh huge capacity
V-mount battery is a nice solution to provide extreme
long duration to ALEXA 35.
Battery side | V-mount of 14.4V/26V/28.8V |
Camera side | B-mount, same voltage as V-mount battery |
MSRP
MSRP
MSRP
-
HB-C420S
500W High Load 420Wh V-mount Battery
28.8V Voltage, 500W Constand Load for high power cine lights
We provide a 1-year conditional warranty, and the following damages/issues are not covered under warranty:
(1) Any damage or malfunction caused by use, maintenance, or installation not in accordance with the User Manual's instructions, including improper battery insertion or removal, incorrect polarity connection, exposure to moisture or conductive debris, or disassembly/repair without authorization of SWIT.
(2) Any damage caused by using third-party batteries, power sources, or accessories that do not comply with the recommended electrical specifications (e.g., voltage, current, or contact pin configuration), including but not limited to electrode overheating, melting, arcing, or short circuits resulting from incompatible battery design or poor battery quality.
(3) Any damage caused by irresistible factors (such as earthquake, fire, lightning, flood, etc.) or human factors including dropping the plate, impact damage, forced battery removal at incorrect angles, or insertion of damaged or deformed batteries.
(4) Any damage or malfunction not caused by the product's design, workmanship, or manufacturing quality — including normal wear and tear of spring-loaded electrodes, contact pins, locking mechanisms, or surface finish scratching.
(5) Electrode breakage, bending, or deformation resulting from violent use, excessive force during battery attachment or detachment, or improper alignment of the battery onto the plate is specifically excluded from warranty coverage. This includes snapped, crushed, or pushed-in contact pins caused by user mishandling.
(6) Electrical or thermal damage (including melted plastic around electrodes, burnt contacts, or discoloration from heat) that is determined to be caused by a third-party battery's internal short circuit, over-current draw, overheating, or defective connector design shall not be covered under this warranty. Such conditions are the responsibility of the battery manufacturer.
