Referring to the Netflix show Love Death Robots and specifically this episode where this issue was explored. https://www.imdb.com/title/tt9...

I thought 5G used less power, so shouldn't the chips run cooler?

If the likes of VW, Uber, Tesla, Lyft, Waymo, Apple and any other new comers start operating self-driving ride-hailing fleets, then the argument of lack of charging infrastructure goes away. This can be centralised at the operators' hub sites.