4.1 Launch system used. With regard to the power source, the choice of the opportunity to fly the Pow'ersat demonstrator is important because, as soon as Lithium source has to be considered, safety constraints apply. Regarding safety, two cases have to be considered: 4.1.1 Man-rated flight. Apply to the STS and any equipment to be installed into the cargo bay. even inactive. That means that if a battery has to be used in Spacelab. Eureca. or Astro- SPAS, they have to be designed, qualified, manufactured the same. So. selection of one of these platforms will lead to extra costs due to safety constraints, with also less flexibility to conduct demonstrator experiment, as the battery will have to be used exactly as planned. One of the possibility to simplify the safety requirements, to be considered, could eventually be to arrange the mission to leave the discharged battery up and not to have to land with it after use. 4.1.2 Unmanned rated flight. No problem, on the shelf or specific battery could be used at the lower cost. 4.2 Demonstrator mission. With regard to the power source, the ratio energy/power required is important as explained in paragraph 3. As an example, if the electrical demand to supply the laser or microwave is 1000 Watts continuous, the existing on the shelf 250 Ah-30 Volts battery could be used for 7 to 8 hours of operation, which represents 7000 to 8000 Wh. These 7 hours of operation could be spread over several days or a TBD period of time, depending of the battery
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