Batteries are so heavy that they do very badly on hilly terrain, especially in snow.
You will never see a battery airplane.
There already are hydrogen airplanes.
{...
In February 1957, a
Martin B-57B of the
NACA flew on hydrogen for 20 min for one of its two
Wright J65 engines rather than jet fuel.
[13] On 15 April 1988, the
Tu-155 first flew as the first hydrogen-powered experimental aircraft,
[14] an adapted
Tu-154 airliner.
Boeing converted a two-seat
Diamond DA20 to run on a
fuel cell designed and built by
Intelligent Energy.
[15] It first flew on April 3, 2008.
[16] The
Antares DLR-H2 is a hydrogen-powered aeroplane from
Lange Aviation and the
German aerospace center.
[17] In July 2010, Boeing unveiled its hydrogen powered
Phantom Eye UAV, that uses two converted
Ford Motor Company piston engines.
[18]
In 2010, the
Rapid 200FC concluded six flight tests fueled by
gaseous hydrogen. The aircraft and the electric and energy system was developed within the
European Union's ENFICA-FC project coordinated by the
Politecnico di Torino.
[19] Hydrogen gas is stored at 350 bar, feeding a 20 kW (27 hp) fuel cell powering a 40 kW (54 hp) electric motor along a 20 kW (27 hp)
lithium polymer battery pack.
On January 11, 2011, an
AeroVironment Global Observer unmanned aircraft completed its first flight powered by a hydrogen-fueled propulsion system.
[20]
Developed by Germany's
DLR Institute of Engineering Thermodynamics, the
DLR HY4 four-seater was powered by a hydrogen fuel cell, its first flight took place on September 29, 2016.
[21] It has the possibility to store 9 kg (20 lb) of hydrogen, 4x11 kW fuel cells and 2x10 kWh batteries.
[22][
better source needed]
On 19 January 2023,
ZeroAvia flew its
Dornier 228 testbed with one turboprop replaced by a prototype hydrogen-electric powertrain in the cabin, consisting of two
fuel cells and a
lithium-ion battery for peak power.
[23] The aim is to have a certifiable system by 2025 to power airframes carrying up to 19 passengers over 300 nmi (560 km).
[23]
On 2 March 2023,
Universal Hydrogen flew a
Dash 8 40-passenger testbed with one engine powered by their hydrogen-electric powertrain. The company has received an order from
Connect Airways to convert 75
ATR 72-600 with their hydrogen powertrains.
[24]
...}