The one massive caveat I see with the drop-in motor conversions is that it's not just the motor -- you need batteries too. Retrofitting those seems like a much

The one massive caveat I see with the drop-in motor conversions is that it's not just the motor -- you need batteries too. Retrofitting those seems like a much harder challenge. In new designs, they're at the bottom of the chassis, because they're large and heavy. In retro-fits, where would they go? Engine bay? In place of gas tank? It doesn't seem like there is enough room, and the weight distribution considerations are a major concern. I see this as a niche market at best. The ICE engine at the heart of a vehicle is an old design. Nevermind all the secondary systems that piggy-back off it, these can probably be adapted. But the distribution of drivetrain into the wheels simplifies the construction massively. One huge advantage of the new electric cars is the lower maintenance, especially with the drivetrain. Converted vehicles would inherit many of the legacy problems, plus new issues stemming from kit conversions and interfacing old systems with new powerplants.