25 years ago I got to drive the first battery powered International delivery truck at the test track at the International Truck Engineering Center in Ft. Wayne Indiana.. It was 33,000 GVW with a 24' dry freight body and lift gate on it. They had 10,000 lbs of cargo inside the box. The truck still had the smallest diesel engine they had available in it. It was a 7.3L T444E (Powerstroke). The engine was only used to charge the batteries and never went above idle the whole time we were there. The batteries were HUGE!!!! They took up the whole frame rail under the 24' box. And you can imagine how heavy those first batteries were!! They were like what you'd see in a fork lift. It takes a crane to pick them up to swap them out. The truck drove just like a golf cart. You pushed down the gas pedal and there was a momentary lag and then you were pushed back in your seat like it was powered by a rocket!! No diesel engine ever felt that good! This was the first attempts at a battery powered truck. And it was a long time ago. But I was impressed. I'm actually surprised that they never brought any battery powered electric delivery truck to market yet.