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The LRV was powered by two 36-volt silver-zinc potassium hydroxide non-rechargable batteries with a capacity of 121 A-h each. The batteries could support the Rover for up to 57 miles of constant travel. The LRV batteries and electronics were passively cooled, using change-of-phase wax thermal capacitor packages and reflective, upward-facing radiating surfaces. While driving, the radiators were covered with mylar blankets to minimize dust accumulation. When stopped, the astronauts would open the blankets and manually remove excess dust from the cooling surfaces with hand brushes.

I have learned, indirectly (from a source connected to the person who designed the LRV thermal control systems), that the batteries were cooled with eicosane, and the drive control electronics were cooled with octadecane. The transmitter was also cooled with a wax, but since it was an add-on, not actually part of the Rover as such, what wax was used is not known.

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