Redox Flow Battery is moveable object that can be use to power up electricals.
History
Redox Flow Battery, known as RBF, is an object existed in the real world. It can may be used like a fuel cell (where the spent fuel is extracted and new fuel is added to the system) or like a rechargeable battery (where an electric power source drives regeneration of the fuel).
Throughout the Series
When Melanie Cavill had to work at Breslauer Weather Station, she requests 6 RFBs from Joseph Wilford, who have a number of batteries in Supply Cars aboard Big Alice.[1] Later she would use the batteries to power up the station and for her EVA Suit, before she can get the power by Solar Panels.[2]
Later when Snowpiercer is heading to New Eden, Alex and Ben needs to clear the blockade which was the results of The First Year Cull of Big Alice, Alex took 3 RFBs with them to power the decommissioned cars and for their EVA Suit.[3]