At 50 tons and 700 kilowatt-hours, this truck is the biggest EV in the world

At 50 tons and 700 kilowatt-hours, this truck is the biggest EV in the world | Ars Technica

Actually there are larger EVs, it may well be the largest BEV in the world.

I have on occasion mentioned my experiences with larger Trolley Assisted haul trucks, diesel-electric trucks that can supplement grid electricity for the diesel power normally used. In the mine's case uphill to get out of the open pit without exhaust captured by weather inside the pit. They have no battery, as they go down into the pit empty so do not generate much power.
http://hutnyak.com/Trolley/Photos/Barrick/TrucksonLineBarrick.JPG

In this use, the truck goes downhill loaded and uphill empty, so net power is generated and stored in a battery pack.