From XL Hybrids, With New D.I.Y. Approach, Gears Up to Go Beyond Vehicle Retrofits:

XL Hybrids powertrain technology (CAD image: XL Hybrids)
XL Hybrids powertrain technology (CAD image: XL Hybrids)

Hybrid electric powertrain (battery, motor, control software, and integration) for commercial fleets of vans and trucks (Boston-based XL Hybrids)