I'd be stunned if they put a MWh of battery on a plane. This plane in particular only has a range of 120 miles electric-only, so it probably has a pack roughly similar to a modern electric pickup. 200 kWh plus or minus.
By comparison, a regular regional jet probably has around 40 MWh of energy in jet fuel.
Megawatt-hours (MWh) are one billion times larger than milliwatt-hours (mWh).
[dead]
IF they end up the size of modern jets, 1MWh is underestimating the need for even an average domestic flight.