Spaceships series: Electrical Batteries module?

[Peter Knutsen]

Originally Posted by vierasmarius

Fuel Cell: 11.25 tons, provides 1 PP for 12 hours per 3.75 tons fuel (48 hours per fuel tank)
MHD: 11.25 tons, provides 2 PP for 6 hours per 3.75 tons fuel (24 hours per fuel tank)
ICE: 12.5 tons, provides 1 PP for 10 hours per 2.5 tons fuel (60 hours per fuel tank)
Gas Turbine: 12.5 tons, provides 2 PP for 4 hours per 2.5 tons fuel (24 hours per fuel tank)

Surprisingly, the TL8 ICE comes out on top, with an "energy density" of 60 PPh (Power Point Hours) per fuel tank.

Are some of these systems dependent on external oxygen?