Centrifugal Battery (flywheel as an energy storage device) has been around [a while] since at least 1857. This comment and geoffc's answer (batteries and Bearings) got me wondering what would the advantages and disadvantages of what in theory (with ceramic/magnetic bearings) could be a battery without end to its rechargeable life would be.
Or said another way; Assuming a Centrifugal Battery built with ceramic/magnetic bearings which would essentially be capable of endless (or 10,000 year) recharging capability. Would the low (Mars, Moon, etc) or zero gravity, make the Centrifugal Battery a better or worse option then it is on Earth. As Kinetic energy recovery systems these have been in use on Earth since the 1950's.