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RE: Watch out Tesla! Cummins Debuts New Heavy Duty 145 kWh Electric Short Haul 18,000 Pound Rig.
the battery swap would be an efficient way to save time, that might even be faster than filling a tank with petrol.
It's been talked about for cars, but there are issues with who owns the batteries. With a fleet of trucks there's less issue. As they can tow a lot anyway they should be able to hook up an extra battery pack for some trips.