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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.