The bebob B290cine B-Mount Batteries (for cameras like the Alexa 35) come complete with 4x 294Wh batteries and a quad charger with the wall cable.

Key Features
+ 4x 294Wh Lithium-Ion B-Mount Batteries
+ Supports up to 20A Maximum Load
+ 4-Bay B-Mount Parallel Charger
+ Independent Charging/Power Adapter Modes
+ 12V D-Tap Accessory Output
+ 5-Step LED Fuel-Gauge
+ Integrated Carry Handle on Charger

Run your B-mount camera and pro video accessories from the B290CINE 14.4/28.8V 294Wh B-Mount Li-ion Battery from Bebob Factory GmbH. Robust and versatile, the B290CINE’s B-mount interface enables powering B-mount devices, either 24 or 12V cameras or lights, with the correct voltage, which is determined by the device’s B-mount plate.

The dual-voltage output is safe to use with your device, as the B-mount will not allow the higher voltage to flow to a device designed to handle 12/14.4 volts, nor will it allow you to underpower your 24V device. The battery features both a D-Tap and USB port for powering accessories. Designed to be strong, reliable, and versatile, this battery is built to withstand falls from 4.9′, while its modular design makes for easy repairs.