Interchangeable modules in cars are not all that interesting. I went down this rabbit hole a few months ago.
The problem is who owns the module? And whoever that is, they have to tolerate their modules moving from point A to point B.
Then the electrical interface for the module is another giant headache because realistically it needs to connect when the module slots in. And that means the plug is rigidly attached to the battery and the other side rigid to the vehicle, so it's gonna be subject to a bunch of vibration, load, etc which is a disaster for designing a plug.
And then at the end of the day, you're saving 5 or 10 minutes of fast charging time to swap a module instead. And fast charging is only getting faster.
But on an aircraft, the owner of the modules is the aircraft owner. There's no compatibility challenge because they buy the aircraft and modules together. You install them by hand before flight, so there's no problem with plugging in a cable when you install it - which eliminates the need for a complex vibration resistant plug.
And battery modules in an aircraft have a different objective than in a car: The goal in an aircraft is to be able to remove battery weight to keep the aircraft under its design maximum while adding payload. PARTICULARLY if you have a combustion engine in addition to electric.
Longer flight -> more fuel needed -> less batteries
More passengers -> less batteries
Short flight, few passengers -> more batteries, save money on fuel...
Caleb James DeLisle
npub105…t88up
2026-09-06 15:52:05 UTC
in reply to nevent1q…65dk
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2026-09-06 15:52:05 UTCEvent JSON
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"content": "Interchangeable modules in cars are not all that interesting. I went down this rabbit hole a few months ago.\n\nThe problem is who owns the module? And whoever that is, they have to tolerate their modules moving from point A to point B.\n\nThen the electrical interface for the module is another giant headache because realistically it needs to connect when the module slots in. And that means the plug is rigidly attached to the battery and the other side rigid to the vehicle, so it's gonna be subject to a bunch of vibration, load, etc which is a disaster for designing a plug.\n\nAnd then at the end of the day, you're saving 5 or 10 minutes of fast charging time to swap a module instead. And fast charging is only getting faster.\n\nBut on an aircraft, the owner of the modules is the aircraft owner. There's no compatibility challenge because they buy the aircraft and modules together. You install them by hand before flight, so there's no problem with plugging in a cable when you install it - which eliminates the need for a complex vibration resistant plug.\n\nAnd battery modules in an aircraft have a different objective than in a car: The goal in an aircraft is to be able to remove battery weight to keep the aircraft under its design maximum while adding payload. PARTICULARLY if you have a combustion engine in addition to electric.\n\nLonger flight -\u003e more fuel needed -\u003e less batteries\nMore passengers -\u003e less batteries\nShort flight, few passengers -\u003e more batteries, save money on fuel...",
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