The CX300 has already undergone years-long testing, and on a single charge it flew a whopping 386 miles.
Beta Technologies ALIA-250
Beta Technologies: Building a Beta Future - Vertical Mag
See the CX300 Electric Aircraft, Which Can Carry 5 People and 1 Pilot
Aircraft - BETA
See the CX300 Electric Aircraft, Which Can Carry 5 People and 1 Pilot
See the CX300 Electric Aircraft, Which Can Carry 5 People and 1 Pilot
BETA Technologies opens electric aircraft production facility
Beta Technologies CX300 Fixed-Wing Electric Plane
See the CX300 Electric Aircraft, Which Can Carry 5 People and 1 Pilot
Beta Technologies: Building a Beta Future - Vertical Mag
Air New Zealand to fly battery-powered electric plane - Executive Traveller