The Centrifugal Battery (flywheel as an energy storage device) has been around 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.