[popey456963]

You can source Li-ion/Li-Poly fairly easily (as a company, almost impossible as an individual) with 250 Wh/kg, I believe I read somewhere that Tesla hit about 260/270 with their latest power walls. Even so, I still have to doubt they'll reach more than 200km range with current technology.

Their mission is to release to the public in 2025 however, which makes the goal much more likely to be hit with improvements in technology.