SWIT HB-A290B 290Wh 28.8V B-Mount Battery

The HB-A290B runs at a fixed 28.8V rather than switching, which keeps the internal electronics simpler and the load rating higher for cameras built around that voltage. It targets the ARRI ALEXA 35, ALEXA 265 and Blackmagic URSA Cine, along with high-power cine lighting sharing the same block.

At 290Wh and a 250W, 10A constant load it holds up when a camera and an on-board light draw from the same pack, and 100W charging at 3A gets it back up between setups. Net weight comes in at 1.52kg, in line with other B-Mount packs at this capacity.