I do know that the 13-14 days of its scheduled life is limited by the duration of sunlight and once the far side of the moon goes dark, the lander will be in temperatures as low as -170° Celsius.
But why is the lander affected by this, given that even other satellites experience eclipses of the Earth, and the Moon, but they still have prolonged lives, and missions like Voyager were alive even when they went extremely far from the Sun?