In my experience, specs are omitted in technical articles IFF somebody is trying to hide something. Like super short flight time.

The MIT battery primer [1] states a specific energy of 150Wh/kg for Li-Ion cells. 150kWh would therefore weigh 1000kg.

Even at double the specific energy, the battery would still weigh in at 500kg, almost 80% of the maximum takeoff weight.

If there is a future for electric airplanes, it is going to be in fixed-wing applications.

[1] http://web.mit.edu/2.009/www/resources/mediaAndArticles/batt...