68 hours was the lander's initial battery life. The solar panels were to recharge the batteries, and the expected operation was up to 3 months. The expected har

68 hours was the lander's initial battery life. The solar panels were to recharge the batteries, and the expected operation was up to 3 months. The expected hard stop is March 2015, when the comet's orbit will take it close enough to the sun that the tech is not expected to survive the heat. Rosetta is also equipped with solar arrays.