Eviation’s 16,500 pound Alice uses a 7800 pound/3500Kg battery, rated at 900KWh, which properly managed between 20% and 80% charge can provide 540KWh, or 540 real-world shaft HP for one hour (remember the motor/controller and wiring are not 100% efficient, so KWh and HP are nearly synonymous)
So, barring some remarkable reduction in lift induced drag (again, remember it takes a well known amount of thrust to create lift) and/or a remarkable ability to remain in high speed cruise flight using only 125HP, this thing is going to have 15 minutes of IFR range.
By way of comparison, our 10,450 pound Pilatus PC-12 uses a flat rated 1200HP, (compare to 1200KWh battery size) to climb to altitude over 20 minutes. Any way you slice it the KWh consumed simply lifting 10,500 pounds to 25,000 feet is about 400KWh. And we’ve not even started to cruise yet.
Don’t tell me Eviation can lift 16,500 pounds to altitude using their 540KWh worth of power and actually go anywhere.