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TFA specifically said volume is the last thing a ship operator wants to sacrifice. Volume used for batteries is volume that cannot be used for cargo.

A huge amount of volume is already used for fuel and the engine. 2 million gallons of fuel for a Panamax is around 7,600 cubic meters.

A TEU is about 38.5 cubic meters. So that works out to about 200 TEU. A Panamax can carry about 5000 TEU worth of containers.

So all the fuel is about 4% of the cargo capacity.