Low Carbon Mobility

What would be the ratio of weight of the battery to that of a Boeing 777 without batteries if the aircraft were to fly transcontinental only using batteries?

2:1
10:1
30:1
100:1

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Correct Answer
30:1

And here's something for you to take back

It has got to with a simple math: Battery energy density (Li-ion, the best bet today) is about 250 kWh/Kg. For aviation fuel (kerosene), it is about 10,000 kWh/Kg, a factor of 40!

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