Yawn.
Let’s compare this with the POH numbers for my 182.
Wing span 36’. Max weight 2950 lb. Engine 230 BHP. Max useful fuel 75 gal. Fuel used for taxi, run up, take off, climb to altitude and a 45 minute reserve 11.2 gal. Endurance at 5,000’ 65% power 725 nm, 5.5 h ~134 KTAS.
Convert HP to kw and fuel gal to kg.
172 kW x 0.65 x 5.5 h = 614.9 kWh of real energy used. The theoretical energy content of 100 LL is irrelevant as 230 HP or 172 kW is the real energy delivered to the prop. The theoretical energy content just means that for every 3 kW delivered to 7 kW is waste heat.
The weight of the fuel used for cruise in kilograms is 174.2 kg.
614.9kWh / 174.2 kg = 3.5 kWh/kg This is the real, effective energy density for 100 LL in a O-470 piston engine.
The energy density of lithium-ion batteries is about 0.3 kWh/kg which is why this electric wonder has twice the wing span, goes slower, has a lower useful load and won’t go very far.
Well, batteries get better over time. Not really. The theoretical maximum energy density of lithium-ion batteries is about 0.6 kWh/kg, meaning the best this airplane will ever do is only half as bad.
The only possible hope for an electric 182 is the lithium-oxygen cell which has a theoretical energy density of 5 - 10 kWh/kg, but after about 30 years of trying, nobody so far has been able to make one that actually works in the real world.