[/font][/size]This is genius. The truck uses gravity to fully recharge the batteries. No external recharging needed it is a closed loop.[/font][/size]
It is not overunity, it is just very smart for the application it is being used for.
http://revolution-green.com/worlds-first-electric-dump-truck-uses-gravity-power-recharge/
Kind Regards
It is clever and probably owes something to F1's KERS etc.
But it will only work if the material collected is from a point higher than the point where it is dropped off.