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The fuel cells built for the Lunar Rover were not designed to be recharged; this was one massive advantage over the batteries used in today's electric cars. The battery chosen used a Silver Oxide - Zinc combination; 23 cells were connected in series to produce 36v. Two such batteries supplied 8kwh of power compared to 1.3kwh for a modern Toyota Pruis Hybrid; but that is designed to be recharged over and over, the Lunar Rover wasn't; it simply wasn't required.
The batteries powered the inertial navigation equipment as well as the four wheel motors. Three trips (EVAs) only consumed around 2kwh out of 8kwh; plenty in reserve for communications. Don’t forget the vehicle only weighed 35kg instead of 2000kg or so, add the two astronauts plus suits (14kg each suit). Maximum load was just 110kg even with collected moon samples. It didn't need to reach 70mph either, just 12mph was sufficient. The Rover needn’t be anywhere near as powerful as an electric car on earth experiencing 6 times the gravity or requiring 6 times the speed; they cannot be compared.
The world's first was built in 1895. So was the technology around by 1971? Yes!
The Lunar Rover couldn't be powerful enough in the 1960's to roll around on the moon and transmit all those TV pictures.