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Most of the weight of the battery isn’t lithium, so the effect isn’t as bad as you might think.

you could start out 4 times lighter than a modern battery pack and end up only 2 times lighter when discharged..

that would be fine!

> Maybe one catch is that the weight of the discharged battery is much higher than the weight of the fully charged one.

That would add an interesting dynamic during a race!

This could make things interesting for aircraft, where currently they get considerably lighter as they reach the end of their flight.