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At 100 dollars per kilowatt hour that would be 28000 dollars of the 43,000 dollars of the truck. At 50 dollars a kilowatt hour, 14000 dollars.

I'm in the solar business but I'm not a good battery salesman :)
Every customer we have is excited about getting a battery and I'm a big letdown when I tell them it's still way too expensive (some still do it).
Home-scale batteries of around 10 kWh, from Tesla, LG-Chem, Sonnen and some others are in the $500-$700/kWh range.
Large scale batteries of ~200,000 kWh are in the $200/kWh range, as I understand.

The $200/kWh price point is low enough that storage is becoming common for these huge systems.
Small scale stuff will take quite a while to get to that point.

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