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A real time life cycle test, simulating geosynchronous orbit operation, on two Ni-Cd cells and one Ni - H2 cell is in progress. Some significant observations on their cycle performance are reported and discussed in this paper.

The first Indian Remote Sensing Satellite IRS 1A was launched on March 17, 1988. The energy storage for this spacecraft was by two 40Ah nickel-cadmium batteries operating between 7% to 8% DOD. The performance of these batteries show marginal degradation over the 3 year mission life.

Space quality 12Ah hermetically sealed, dry powder sintered plaque, electrochemically impregnated prismatic nickel cadmium cells with special negative treatment have been designed and developed by Vikram Sarabhai Space Centre (VSSC), a unit of Indian Space Research Organisation (ISRO) for use on LEO Satellites. Five cells have undergone detailed qualification tests and are undergoing real time life cycling at ISRO Satellite Centre (ISAC). This paper gives details of the cell development and testing and discusses certain aspects like negative treatment, cell storage and cycling test results of 6000 cycles which have been completed so far.