KA-B30B B-mount to B-mount Hotswap Plate

›  22-33.6V B-mount battery hotswap

›  28V, 32Wh 3Ah battery cells inside

›  200W constant high load

›  At least 2 minutes run time

›  120 seconds countdown display

›  2x D-tap regulated 14V output

›  1x 2-pin LEMO regulated 14V output

›  USB 5V/2A x1 power output

›  22-33.6V 8-pin input for power station hotswap

›  Aluminum CNC unibody housing

›  Multiple circuit protections


B-mount Hot-swap Plate

KA-B30B is a B-mount extended plate with battery cells inside, and when you changing battery, the plate will take over the power supply until a new battery is mounted on. So you don’ t need to switch off the cameras with this hot-swap plate.

120 Seconds Countdown Display

The hotswap plate provides an LCD screen to display countdown seconds when changing battery.
When battery is removed, the screen will countdown from 120s. You just need to put on a new battery before it count down to 0.
The new battery will charge the hotswap plate as well. You can see the countdown seconds will go back to 120s after a period of time.
The inner cells will ensure at least 120 seconds at 200W high load even after 500 times cycle.

32Wh, 28V, 200W High Load

KA-B30B has 32Wh battery cells inside, provide 200W constant high load for cine cameras and all camera-top devices.
The plate supports 22-33.6V B-mount battery, and power camera at 22-33.6V.
When B-mount battery is removed, the inner cells provide regulated 28V to power camera.

Power Interfaces

KA-B30B provides:
1x 2-pin LEMO Reg. 14V 5A 70W out
2x D-tap Reg. 14V 5A 70W (each) out
1x USB-A 5V/2A output
1x 8-pin 22-33.6V DC input (For power station hotswap)


KA-B30B matches with ARRI ALEXA35 perfectly to provide uninterrupted power, and will work with all the future ARRI cameras/lights with B-mount battery plate.

Inner battery voltage

28V regulated

Inner battery capacity


Power load

200W constant high load

B-mount power out

Attach battery: 22-33.6V to camera

Remove battery: 28V / 200W to camera

D-tap output x2

14V regulated, 70W

2-pin LEMO output

14V regulated, 70W

USB-A output

5V, 10W/2A

8-pin LEMO input




Net weight

Net 749.6g; With package0.9kg

Basic Package




  • KA-S30S

    V-mount Hotswap Plate

    200W high load, 2 minutes hot-swap, countdown seconds display, CNC housing

  • HB-A290B

    290Wh 28.8V B-mount Battery Pack

    ALEXA 35 battery, 250W/10A high load, D-tap 16V x2, USB-C 60W in&out, OLED power info

  • PC-P461B

    4x100W Super Fast B-mount Charger

    3h50m fully charge 4x 290Wh batteries, 3.5-inch color LCD screen

  • KA-A30B

    B-mount Hotswap Plate for SXT/LF/65

    Install on ARRI ALEXA SXT/LF/65 install, Run 2min at 200W, 120s countdown display

  • KA-R30B

    B-mount Hotswap Plate for MINI / MINI LF

    200W high load, 2 minutes hot-swap, countdown seconds display, CNC housing

  • KA-R31B

    B-mount Hotswap Plate for MINI / MINI LF

    200W high load, 2 minutes hot-swap, SDI 1-2 with isolater, CNC housing


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